0.1.3 YBImageBrowser 通过pod 形式集成

daojian
1 parent e5408852
Showing 55 changed files with 4 additions and 4779 deletions
CNLiveOrganizationValidationModule.podspec
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/Controller/CNLiveBOraganizationDetailController.m
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/AuxiliaryView/YBIBAuxiliaryViewHandler.h
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/AuxiliaryView/YBIBAuxiliaryViewHandler.m
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/AuxiliaryView/YBIBLoadingView.h
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/AuxiliaryView/YBIBLoadingView.m
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/AuxiliaryView/YBIBToastView.h
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/AuxiliaryView/YBIBToastView.m
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/NSObject+YBImageBrowser.h
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/NSObject+YBImageBrowser.m
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBAnimatedTransition.h
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBAnimatedTransition.m
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBCollectionView.h
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBCollectionView.m
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBCollectionViewLayout.h
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBCollectionViewLayout.m
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBContainerView.h
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBContainerView.m
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBDataMediator.h
CNLiveOrganizationValidationModule/Classes/CNLiveOrganizationValidationModule/YBImageBrowser/Base/YBIBDataMediator.m
@@ -8,7 +8,7 @@
  
 Pod::Spec.new do |s|
   s.name             = 'CNLiveOrganizationValidationModule'
-  s.version          = '0.1.2'
+  s.version          = '0.1.3'
   s.summary          = '机构认证模块'
  
 # This description is used to generate tags and improve search results.
@@ -78,7 +78,7 @@ Pod::Spec.new do |s|
   ########################################
   s.dependency  'CNLiveNewTripartiteManagement/RSKImageCropper'
 #  #相册展示
-#  s.dependency 'YBImageBrowser'
+  s.dependency 'YBImageBrowser'
  
  
  
@@ -20,8 +20,8 @@
 #import <QMUIKit/QMUIKit.h>
 //#import <YYKit/YYKit.h>
 #import <objc/runtime.h>
-#import "YBImageBrowser.h"
-#import "YBIBImageData.h"
+#import <YBImageBrowser/YBImageBrowser.h>
+//#import "YBIBImageData.h"
 #import "UIImage+OrganizationValidation.h"
  
  
-//
-//  YBIBAuxiliaryViewHandler.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/27.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@protocol YBIBAuxiliaryViewHandler <NSObject>
-
-@required
-
-/// 展示正确情况的提示
-- (void)yb_showCorrectToastWithContainer:(UIView *)container text:(NSString *)text;
-/// 展示错误情况的提示
-- (void)yb_showIncorrectToastWithContainer:(UIView *)container text:(NSString *)text;
-/// 隐藏所有提示
-- (void)yb_hideToastWithContainer:(UIView *)container;
-
-/// 展示加载视图
-- (void)yb_showLoadingWithContainer:(UIView *)container;
-/// 展示带进度的加载视图
-- (void)yb_showLoadingWithContainer:(UIView *)container progress:(CGFloat)progress;
-/// 展示带文字的视图
-- (void)yb_showLoadingWithContainer:(UIView *)container text:(NSString *)text;
-/// 隐藏所有视图
-- (void)yb_hideLoadingWithContainer:(UIView *)container;
-
-@end
-
-@interface YBIBAuxiliaryViewHandler : NSObject <YBIBAuxiliaryViewHandler>
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBAuxiliaryViewHandler.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/27.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBAuxiliaryViewHandler.h"
-#import "YBIBToastView.h"
-#import "YBIBLoadingView.h"
-
-@implementation YBIBAuxiliaryViewHandler
-
-#pragma mark - <YBIBAuxiliaryViewHandler>
-
-- (void)yb_showCorrectToastWithContainer:(UIView *)container text:(NSString *)text {
-    [container ybib_showHookToast:text];
-}
-
-- (void)yb_showIncorrectToastWithContainer:(UIView *)container text:(NSString *)text {
-    [container ybib_showForkToast:text];
-}
-
-- (void)yb_hideToastWithContainer:(UIView *)container {
-    [container ybib_hideToast];
-}
-
-- (void)yb_showLoadingWithContainer:(UIView *)container {
-    [container ybib_showLoading];
-}
-
-- (void)yb_showLoadingWithContainer:(UIView *)container progress:(CGFloat)progress {
-    [container ybib_showLoadingWithProgress:progress];
-}
-
-- (void)yb_showLoadingWithContainer:(UIView *)container text:(NSString *)text {
-    [container ybib_showLoadingWithText:text click:nil];
-}
-
-- (void)yb_hideLoadingWithContainer:(UIView *)container {
-    [container ybib_hideLoading];
-}
-
-@end
-//
-//  YBIBLoadingView.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/9/1.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface UIView (YBIBLoading)
-
-- (void)ybib_showLoading;
-
-- (void)ybib_showLoadingWithProgress:(CGFloat)progress;
-
-- (void)ybib_showLoadingWithText:(NSString *)text click:(nullable void(^)(void))click;
-
-- (void)ybib_hideLoading;
-
-@end
-
-
-@interface YBIBLoadingView : UIView
-
-- (void)show;
-
-- (void)showProgress:(CGFloat)progress;
-
-- (void)showText:(NSString *)text click:(void(^)(void))click;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBLoadingView.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/9/1.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import "YBIBLoadingView.h"
-#import "YBIBIconManager.h"
-#import <objc/runtime.h>
-
-@interface UIView ()
-@property (nonatomic, strong, readonly) YBIBLoadingView *ybib_loading;
-@end
-
-@implementation UIView (YBIBLoading)
-
-- (void)ybib_showLoadingWithProgress:(CGFloat)progress {
-    [self ybib_addLoadingView];
-    [self.ybib_loading showProgress:progress];
-}
-
-- (void)ybib_showLoading {
-    [self ybib_addLoadingView];
-    [self.ybib_loading show];
-}
-
-- (void)ybib_showLoadingWithText:(NSString *)text click:(void (^)(void))click {
-    [self ybib_addLoadingView];
-    [self.ybib_loading showText:text click:click];
-}
-
-- (void)ybib_addLoadingView {
-    YBIBLoadingView *loading = self.ybib_loading;
-    if (!loading.superview) {
-        [self addSubview:loading];
-        loading.translatesAutoresizingMaskIntoConstraints = NO;
-        NSLayoutConstraint *layA = [NSLayoutConstraint constraintWithItem:loading attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1 constant:0];
-        NSLayoutConstraint *layB = [NSLayoutConstraint constraintWithItem:loading attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1 constant:0];
-        NSLayoutConstraint *layC = [NSLayoutConstraint constraintWithItem:loading attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1 constant:0];
-        NSLayoutConstraint *layD = [NSLayoutConstraint constraintWithItem:loading attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTop multiplier:1 constant:0];
-        [self addConstraints:@[layA, layB, layC, layD]];
-    }
-}
-
-- (void)ybib_hideLoading {
-    YBIBLoadingView *loading = self.ybib_loading;
-    if (loading && loading.superview) {
-        [loading removeFromSuperview];
-    }
-}
-
-static void *YBIBLoadingKey = &YBIBLoadingKey;
-- (void)setYbib_loading:(YBIBLoadingView *)ybib_loading {
-    objc_setAssociatedObject(self, YBIBLoadingKey, ybib_loading, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-- (YBIBLoadingView *)ybib_loading {
-    YBIBLoadingView *loading = objc_getAssociatedObject(self, YBIBLoadingKey);
-    if (!loading) {
-        loading = [YBIBLoadingView new];
-        self.ybib_loading = loading;
-    }
-    return loading;
-}
-
-@end
-
-
-@interface YBIBProgressDrawView : UIView
-@property (nonatomic, assign) CGFloat progress;
-@end
-@implementation YBIBProgressDrawView
-- (void)drawRect:(CGRect)rect {
-    if (self.isHidden) return;
-    
-    CGFloat progress = (isnan(_progress) || isinf(_progress) || _progress < 0) ? 0 : _progress;
-    
-    CGFloat radius = 17;
-    CGFloat strokeWidth = 3;
-    CGPoint center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
-    
-    [[UIColor lightGrayColor] setStroke];
-    UIBezierPath *bottomPath = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:0 endAngle:M_PI * 2 clockwise:YES];
-    bottomPath.lineWidth = 4.0;
-    bottomPath.lineCapStyle = kCGLineCapRound;
-    bottomPath.lineJoinStyle = kCGLineCapRound;
-    [bottomPath stroke];
-    
-    [[UIColor whiteColor] setStroke];
-    UIBezierPath *activePath = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:-M_PI / 2.0 endAngle:M_PI * 2 * progress - M_PI / 2.0 clockwise:true];
-    activePath.lineWidth = strokeWidth;
-    activePath.lineCapStyle = kCGLineCapRound;
-    activePath.lineJoinStyle = kCGLineCapRound;
-    [activePath stroke];
-    
-    NSShadow *shadow = [NSShadow new];
-    shadow.shadowBlurRadius = 4;
-    shadow.shadowOffset = CGSizeMake(0, 1);
-    shadow.shadowColor = UIColor.darkGrayColor;
-    NSString *string = [NSString stringWithFormat:@"%.0lf%@", progress * 100, @"%"];
-    NSMutableAttributedString *atts = [[NSMutableAttributedString alloc] initWithString:string attributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:10], NSForegroundColorAttributeName:[UIColor whiteColor], NSShadowAttributeName:shadow}];
-    CGSize size = atts.size;
-    [atts drawAtPoint:CGPointMake(center.x - size.width / 2.0, center.y - size.height / 2.0)];
-}
-@end
-
-
-typedef NS_ENUM(NSUInteger, YBImageBrowserProgressType) {
-    YBImageBrowserProgressTypeProgress,
-    YBImageBrowserProgressTypeLoad,
-    YBImageBrowserProgressTypeText
-};
-
-@interface YBIBLoadingView () {
-    YBImageBrowserProgressType  _type;
-}
-@property (nonatomic, strong) UILabel *textLabel;
-@property (nonatomic, strong) UIImageView *imageView;
-@property (nonatomic, strong) YBIBProgressDrawView *drawView;
-@property (nonatomic, copy) void(^clickTextLabelBlock)(void);
-@end
-
-@implementation YBIBLoadingView
-
-#pragma mark life cycle
-
-- (instancetype)initWithFrame:(CGRect)frame {
-    self = [super initWithFrame:frame];
-    if (self) {
-        self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0];
-        self.userInteractionEnabled = NO;
-        
-        [self addSubview:self.drawView];
-        [self addSubview:self.textLabel];
-        [self addSubview:self.imageView];
-    }
-    return self;
-}
-
-- (void)updateConstraints {
-    self.textLabel.translatesAutoresizingMaskIntoConstraints = NO;
-    NSLayoutConstraint *layA = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1 constant:20];
-    NSLayoutConstraint *layB = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1 constant:-20];
-    NSLayoutConstraint *layC = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
-    
-    self.imageView.translatesAutoresizingMaskIntoConstraints = NO;
-    NSLayoutConstraint *layE = [NSLayoutConstraint constraintWithItem:self.imageView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
-    NSLayoutConstraint *layF = [NSLayoutConstraint constraintWithItem:self.imageView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
-    
-    self.drawView.translatesAutoresizingMaskIntoConstraints = NO;
-    NSLayoutConstraint *layG = [NSLayoutConstraint constraintWithItem:self.drawView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
-    NSLayoutConstraint *layH = [NSLayoutConstraint constraintWithItem:self.drawView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
-    NSLayoutConstraint *layI = [NSLayoutConstraint constraintWithItem:self.drawView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:50];
-    NSLayoutConstraint *layJ = [NSLayoutConstraint constraintWithItem:self.drawView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:50];
-    
-    [self addConstraints:@[layA, layB, layC, layE, layF, layG, layH, layI, layJ]];
-    [super updateConstraints];
-}
-
-#pragma mark public
-
-- (void)showProgress:(CGFloat)progress {
-    self.userInteractionEnabled = NO;
-    _type = YBImageBrowserProgressTypeProgress;
-    self.drawView.hidden = NO;
-    self.textLabel.hidden = YES;
-    self.imageView.hidden = YES;
-    [self stopImageViewAnimation];
-    
-    self.drawView.progress = progress;
-    [self.drawView setNeedsDisplay];
-}
-
-- (void)show {
-    self.userInteractionEnabled = NO;
-    _type = YBImageBrowserProgressTypeLoad;
-    self.drawView.hidden = YES;
-    self.textLabel.hidden = YES;
-    self.imageView.hidden = NO;
-    
-    [self startImageViewAnimation];
-    [self.drawView setNeedsDisplay];
-}
-
-- (void)startImageViewAnimation {
-    CABasicAnimation *ra = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
-    ra.toValue = [NSNumber numberWithFloat:M_PI * 2];
-    ra.duration = 1;
-    ra.cumulative = YES;
-    ra.repeatCount = HUGE_VALF;
-    ra.removedOnCompletion = NO;
-    ra.fillMode = kCAFillModeForwards;
-    [self.imageView.layer addAnimation:ra forKey:@"ra"];
-}
-
-- (void)stopImageViewAnimation {
-    [self.imageView.layer removeAllAnimations];
-}
-
-- (void)showText:(NSString *)text click:(void (^)(void))click {
-    self.userInteractionEnabled = click ? YES : NO;
-    _type = YBImageBrowserProgressTypeText;
-    self.drawView.hidden = YES;
-    self.textLabel.hidden = NO;
-    self.imageView.hidden = YES;
-    [self stopImageViewAnimation];
-    
-    self.textLabel.text = text;
-    self.clickTextLabelBlock = click;
-    [self.drawView setNeedsDisplay];
-}
-
-#pragma mark - touch event
-
-- (void)respondsToTapTextlabel {
-    if (self.clickTextLabelBlock) {
-        self.clickTextLabelBlock();
-    }
-}
-
-#pragma mark - getter
-
-- (YBIBProgressDrawView *)drawView {
-    if (!_drawView) {
-        _drawView = [YBIBProgressDrawView new];
-        _drawView.backgroundColor = [UIColor clearColor];
-    }
-    return _drawView;
-}
-
-- (UILabel *)textLabel {
-    if (!_textLabel) {
-        _textLabel = [UILabel new];
-        _textLabel.textColor = [UIColor whiteColor];
-        _textLabel.numberOfLines = 0;
-        _textLabel.font = [UIFont systemFontOfSize:14];
-        _textLabel.textAlignment = NSTextAlignmentCenter;
-        UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToTapTextlabel)];
-        [_textLabel addGestureRecognizer:tapGesture];
-        _textLabel.userInteractionEnabled = YES;
-    }
-    return _textLabel;
-}
-
-- (UIImageView *)imageView {
-    if (!_imageView) {
-        _imageView = [UIImageView new];
-        _imageView.image = [YBIBIconManager sharedManager].loadingImage();
-        _imageView.layer.shadowColor = UIColor.darkGrayColor.CGColor;
-        _imageView.layer.shadowOffset = CGSizeMake(0, 1);
-        _imageView.layer.shadowOpacity = 1;
-        _imageView.layer.shadowRadius = 4;
-    }
-    return _imageView;
-}
-
-@end
-//
-//  YBIBToastView.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/20.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface UIView (YBIBToast)
-
-- (void)ybib_showHookToast:(NSString *)text;
-
-- (void)ybib_showForkToast:(NSString *)text;
-
-- (void)ybib_hideToast;
-
-@end
-
-
-typedef NS_ENUM(NSInteger, YBIBToastType) {
-    YBIBToastTypeNone,
-    YBIBToastTypeHook,
-    YBIBToastTypeFork
-};
-
-@interface YBIBToastView : UIView
-
-- (void)showWithText:(NSString *)text type:(YBIBToastType)type;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBToastView.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/20.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBToastView.h"
-#import <objc/runtime.h>
-
-@interface UIView ()
-@property (nonatomic, strong, readonly) YBIBToastView *ybib_toast;
-@end
-
-@implementation UIView (YBIBToast)
-
-- (void)ybib_showHookToast:(NSString *)text {
-    [self ybib_showToastWithText:text type:YBIBToastTypeHook hideAfterDelay:1.7];
-}
-
-- (void)ybib_showForkToast:(NSString *)text {
-    [self ybib_showToastWithText:text type:YBIBToastTypeFork hideAfterDelay:1.7];
-}
-
-- (void)ybib_showToastWithText:(NSString *)text type:(YBIBToastType)type hideAfterDelay:(NSTimeInterval)delay {
-    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(ybib_hideToast) object:nil];
-    
-    YBIBToastView *toast = self.ybib_toast;
-    if (!toast.superview) {
-        [self addSubview:toast];
-        toast.translatesAutoresizingMaskIntoConstraints = NO;
-        NSLayoutConstraint *layA = [NSLayoutConstraint constraintWithItem:toast attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
-        NSLayoutConstraint *layB = [NSLayoutConstraint constraintWithItem:toast attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
-        NSLayoutConstraint *layC = [NSLayoutConstraint constraintWithItem:toast attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1 constant:40];
-        NSLayoutConstraint *layD = [NSLayoutConstraint constraintWithItem:toast attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationLessThanOrEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1 constant:-40];
-        [self addConstraints:@[layA, layB, layC, layD]];
-    }
-    
-    [toast showWithText:text type:type];
-    [self performSelector:@selector(ybib_hideToast) withObject:nil afterDelay:delay];
-}
-
-- (void)ybib_hideToast {
-    YBIBToastView *toast = self.ybib_toast;
-    if (toast && toast.superview) {
-        [UIView animateWithDuration:0.25 animations:^{
-            toast.alpha = 0;
-        } completion:^(BOOL finished) {
-            [toast removeFromSuperview];
-            toast.alpha = 1;
-        }];
-    }
-}
-
-static void *YBIBToastKey = &YBIBToastKey;
-- (void)setYbib_toast:(YBIBToastView *)ybib_toast {
-    objc_setAssociatedObject(self, YBIBToastKey, ybib_toast, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-- (YBIBToastView *)ybib_toast {
-    YBIBToastView *toast = objc_getAssociatedObject(self, YBIBToastKey);
-    if (!toast) {
-        toast = [YBIBToastView new];
-        self.ybib_toast = toast;
-    }
-    return toast;
-}
-
-@end
-
-
-@interface YBIBToastView () {
-    YBIBToastType _type;
-    CAShapeLayer *_shapeLayer;
-}
-@property (nonatomic, strong) UILabel *textLabel;
-@end
-
-@implementation YBIBToastView
-
-#pragma mark - life cycle
-
-- (instancetype)initWithFrame:(CGRect)frame {
-    self = [super initWithFrame:frame];
-    if (self) {
-        self.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.8];
-        self.userInteractionEnabled = NO;
-        self.layer.cornerRadius = 7;
-        
-        [self addSubview:self.textLabel];
-    }
-    return self;
-}
-
-- (void)updateConstraints {
-    self.textLabel.translatesAutoresizingMaskIntoConstraints = NO;
-    NSLayoutConstraint *layA = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeft multiplier:1 constant:20];
-    NSLayoutConstraint *layB = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeRight multiplier:1 constant:-20];
-    NSLayoutConstraint *layC = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeBottom multiplier:1 constant:-15];
-    NSLayoutConstraint *layD = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTop multiplier:1 constant:70];
-    NSLayoutConstraint *layE = [NSLayoutConstraint constraintWithItem:self.textLabel attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:60];
-    [self addConstraints:@[layA, layB, layC, layD, layE]];
-    [super updateConstraints];
-}
-
-- (void)layoutSubviews {
-    [super layoutSubviews];
-    [self startAnimation];
-}
-
-#pragma mark - animation
-
-- (void)showWithText:(NSString *)text type:(YBIBToastType)type {
-    self.textLabel.text = text;
-    _type = type;
-    [self setNeedsLayout];
-}
-
-- (void)startAnimation {
-    if (_shapeLayer && _shapeLayer.superlayer) {
-        [_shapeLayer removeFromSuperlayer];
-    }
-    _shapeLayer = [CAShapeLayer layer];
-    _shapeLayer.strokeColor = [UIColor whiteColor].CGColor;
-    _shapeLayer.fillColor = [UIColor clearColor].CGColor;
-    _shapeLayer.lineWidth = 5.0;
-    _shapeLayer.lineCap = @"round";
-    _shapeLayer.lineJoin = @"round";
-    _shapeLayer.strokeStart = 0.0;
-    _shapeLayer.strokeEnd = 0.0;
-    
-    UIBezierPath *bezierPath = [UIBezierPath bezierPath];
-    CGFloat r = 13.0;
-    CGFloat x = self.bounds.size.width / 2.0;
-    CGFloat y = 38.0;
-    switch (_type) {
-        case YBIBToastTypeHook: {
-            [bezierPath moveToPoint:CGPointMake(x - r - r / 2, y)];
-            [bezierPath addLineToPoint:CGPointMake(x - r / 2, y + r)];
-            [bezierPath addLineToPoint:CGPointMake(x + r * 2 - r / 2, y - r)];
-        }
-            break;
-        case YBIBToastTypeFork: {
-            [bezierPath moveToPoint:CGPointMake(x - r, y - r)];
-            [bezierPath addLineToPoint:CGPointMake(x + r, y + r)];
-            [bezierPath moveToPoint:CGPointMake(x - r, y + r)];
-            [bezierPath addLineToPoint:CGPointMake(x + r, y - r)];
-        }
-            break;
-        default:break;
-    }
-    
-    CABasicAnimation *baseAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
-    [baseAnimation setFromValue:@0.0];
-    [baseAnimation setToValue:@1.0];
-    [baseAnimation setDuration:0.3];
-    baseAnimation.removedOnCompletion = NO;
-    baseAnimation.fillMode = kCAFillModeBoth;
-    
-    _shapeLayer.path = bezierPath.CGPath;
-    [self.layer addSublayer:_shapeLayer];
-    [_shapeLayer addAnimation:baseAnimation forKey:@"strokeEnd"];
-}
-
-#pragma mark - getter
-
-- (UILabel *)textLabel {
-    if (!_textLabel) {
-        _textLabel = [UILabel new];
-        _textLabel.textColor = [UIColor whiteColor];
-        _textLabel.font = [UIFont systemFontOfSize:14];
-        _textLabel.textAlignment = NSTextAlignmentCenter;
-        _textLabel.numberOfLines = 0;
-    }
-    return _textLabel;
-}
-
-@end
-
-//
-//  NSObject+YBImageBrowser.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/9/26.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface NSObject (YBImageBrowser)
-
-@property (nonatomic, assign) CGFloat ybib_originAlpha;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  NSObject+YBImageBrowser.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/9/26.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import "NSObject+YBImageBrowser.h"
-#import <objc/runtime.h>
-
-@implementation NSObject (YBImageBrowser)
-
-static void *YBIBOriginAlphaKey = &YBIBOriginAlphaKey;
-- (void)setYbib_originAlpha:(CGFloat)ybib_originAlpha {
-    objc_setAssociatedObject(self, YBIBOriginAlphaKey, @(ybib_originAlpha), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-- (CGFloat)ybib_originAlpha {
-    NSNumber *alpha = objc_getAssociatedObject(self, YBIBOriginAlphaKey);
-    return alpha ? alpha.floatValue : 1;
-}
-
-@end
-//
-//  YBIBAnimatedTransition.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/6.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@protocol YBIBAnimatedTransition <NSObject>
-@required
-
-- (void)yb_showTransitioningWithContainer:(UIView *)container startView:(nullable __kindof UIView *)startView startImage:(nullable UIImage *)startImage endFrame:(CGRect)endFrame orientation:(UIDeviceOrientation)orientation completion:(void(^)(void))completion;
-
-- (void)yb_hideTransitioningWithContainer:(UIView *)container startView:(nullable __kindof UIView *)startView endView:(UIView *)endView orientation:(UIDeviceOrientation)orientation completion:(void(^)(void))completion;
-
-@end
-
-
-typedef NS_ENUM(NSInteger, YBIBTransitionType) {
-    /// 无动效
-    YBIBTransitionTypeNone,
-    /// 渐隐
-    YBIBTransitionTypeFade,
-    /// 连贯移动
-    YBIBTransitionTypeCoherent
-};
-
-@interface YBIBAnimatedTransition : NSObject <YBIBAnimatedTransition>
-
-/// 入场动效类型
-@property (nonatomic, assign) YBIBTransitionType showType;
-/// 出场动效类型
-@property (nonatomic, assign) YBIBTransitionType hideType;
-
-/// 入场动效持续时间
-@property (nonatomic, assign) NSTimeInterval showDuration;
-/// 出场动效持续时间
-@property (nonatomic, assign) NSTimeInterval hideDuration;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBAnimatedTransition.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/6.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBAnimatedTransition.h"
-
-extern CGFloat YBIBRotationAngle(UIDeviceOrientation startOrientation, UIDeviceOrientation endOrientation);
-
-@implementation YBIBAnimatedTransition
-
-#pragma mark - life cycle
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        _showType = _hideType = YBIBTransitionTypeCoherent;
-        _showDuration = _hideDuration = 0.25;
-    }
-    return self;
-}
-
-#pragma mark - <YBIBAnimationHandler>
-
-- (void)yb_showTransitioningWithContainer:(UIView *)container startView:(__kindof UIView *)startView startImage:(UIImage *)startImage endFrame:(CGRect)endFrame orientation:(UIDeviceOrientation)orientation completion:(void (^)(void))completion {
-    YBIBTransitionType type = self.showType;
-    if (type == YBIBTransitionTypeCoherent) {
-        if (CGRectIsEmpty(endFrame) || !startView || orientation != (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation) {
-            type = YBIBTransitionTypeFade;
-        }
-    }
-    
-    switch (type) {
-        case YBIBTransitionTypeNone: {
-            completion();
-        }
-            break;
-        case YBIBTransitionTypeFade: {
-            
-            BOOL animateValid = !CGRectIsEmpty(endFrame) && startView;
-            
-            UIImageView *animateImageView;
-            if (animateValid) {
-                animateImageView = [self imageViewAssimilateToView:startView];
-                animateImageView.frame = endFrame;
-                animateImageView.image = startImage;
-                [container addSubview:animateImageView];
-            }
-            
-            CGFloat rawAlpha = container.alpha;
-            container.alpha = 0;
-            
-            if (!animateValid) completion();
-                
-            [UIView animateWithDuration:self.showDuration animations:^{
-                container.alpha = rawAlpha;
-            } completion:^(BOOL finished) {
-                if (animateValid) {
-                    [animateImageView removeFromSuperview];
-                    completion();
-                }
-            }];
-            
-        }
-            break;
-        case YBIBTransitionTypeCoherent: {
-            
-            UIImageView *animateImageView = [self imageViewAssimilateToView:startView];
-            animateImageView.frame = [startView convertRect:startView.bounds toView:container];
-            animateImageView.image = startImage;
-            
-            [container addSubview:animateImageView];
-            
-            UIColor *rawBackgroundColor = container.backgroundColor;
-            container.backgroundColor = [rawBackgroundColor colorWithAlphaComponent:0];
-            
-            [UIView animateWithDuration:self.showDuration animations:^{
-                animateImageView.frame = endFrame;
-                container.backgroundColor = rawBackgroundColor;
-            } completion:^(BOOL finished) {
-                completion();
-                // Disappear smoothly.
-                [UIView animateWithDuration:0.2 animations:^{
-                    animateImageView.alpha = 0;
-                } completion:^(BOOL finished) {
-                    [animateImageView removeFromSuperview];
-                }];
-            }];
-            
-        }
-            break;
-    }
-}
-
-- (void)yb_hideTransitioningWithContainer:(UIView *)container startView:(__kindof UIView *)startView endView:(UIView *)endView orientation:(UIDeviceOrientation)orientation completion:(void (^)(void))completion {
-    YBIBTransitionType type = self.hideType;
-    if (type == YBIBTransitionTypeCoherent && (!startView || !endView)) {
-        type = YBIBTransitionTypeFade;
-    }
-    
-    switch (type) {
-        case YBIBTransitionTypeNone: {
-            completion();
-        }
-            break;
-        case YBIBTransitionTypeFade: {
-            
-            CGFloat rawAlpha = container.alpha;
-            
-            [UIView animateWithDuration:self.hideDuration animations:^{
-                container.alpha = 0;
-            } completion:^(BOOL finished) {
-                completion();
-                container.alpha = rawAlpha;
-            }];
-            
-        }
-            break;
-        case YBIBTransitionTypeCoherent: {
-            
-            CGRect startFrame = startView.frame;
-            CGRect endFrame = [endView convertRect:endView.bounds toView:startView.superview];
-            
-            UIColor *rawBackgroundColor = container.backgroundColor;
-            
-            [UIView animateWithDuration:self.hideDuration animations:^{
-                
-                container.backgroundColor = [rawBackgroundColor colorWithAlphaComponent:0];
-                
-                startView.contentMode = endView.contentMode;
-                
-                CGAffineTransform transform = startView.transform;
-                UIDeviceOrientation statusBarOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
-                if (orientation != statusBarOrientation) {
-                    transform = CGAffineTransformRotate(transform, YBIBRotationAngle(orientation, statusBarOrientation));
-                }
-                
-                if ([startView isKindOfClass:UIImageView.self]) {
-                    startView.frame = endFrame;
-                    startView.transform = transform;
-                } else {
-                    CGFloat scale = MAX(endFrame.size.width / startFrame.size.width, endFrame.size.height / startFrame.size.height);
-                    startView.center = CGPointMake(endFrame.size.width * startView.layer.anchorPoint.x + endFrame.origin.x, endFrame.size.height * startView.layer.anchorPoint.y + endFrame.origin.y);
-                    startView.transform = CGAffineTransformScale(transform, scale, scale);
-                }
-                
-            } completion:^(BOOL finished) {
-                completion();
-                container.backgroundColor = rawBackgroundColor;
-            }];
-            
-        }
-            break;
-    }
-}
-
-#pragma mark - private
-
-- (UIImageView *)imageViewAssimilateToView:(nullable __kindof UIView *)view {
-    UIImageView *animateImageView = [UIImageView new];
-    if ([view isKindOfClass:UIImageView.self]) {
-        animateImageView.contentMode = view.contentMode;
-    } else {
-        animateImageView.contentMode = UIViewContentModeScaleAspectFill;
-    }
-    animateImageView.layer.masksToBounds = view.layer.masksToBounds;
-    animateImageView.layer.cornerRadius = view.layer.cornerRadius;
-    animateImageView.layer.backgroundColor = view.layer.backgroundColor;
-    return animateImageView;
-}
-
-@end
-//
-//  YBIBCollectionView.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/6.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBCollectionViewLayout.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface YBIBCollectionView : UICollectionView
-
-@property (nonatomic, strong, readonly) YBIBCollectionViewLayout *layout;
-
-- (NSString *)reuseIdentifierForCellClass:(Class)cellClass;
-
-- (nullable UICollectionViewCell *)centerCell;
-
-- (void)scrollToPage:(NSInteger)page;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBCollectionView.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/6.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBCollectionView.h"
-
-@implementation YBIBCollectionView {
-    NSMutableSet *_reuseSet;
-}
-
-#pragma mark - life cycle
-
-- (instancetype)initWithFrame:(CGRect)frame {
-    _layout = [YBIBCollectionViewLayout new];
-    return [self initWithFrame:frame collectionViewLayout:_layout];
-}
-
-- (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(nonnull UICollectionViewLayout *)layout {
-    self = [super initWithFrame:frame collectionViewLayout:layout];
-    if (self) {
-        self.backgroundColor = [UIColor clearColor];
-        self.pagingEnabled = YES;
-        self.showsHorizontalScrollIndicator = NO;
-        self.showsVerticalScrollIndicator = NO;
-        self.alwaysBounceVertical = NO;
-        self.alwaysBounceHorizontal = NO;
-        self.decelerationRate = UIScrollViewDecelerationRateFast;
-        if (@available(iOS 11.0, *)) {
-            self.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
-        }
-        _reuseSet = [NSMutableSet set];
-    }
-    return self;
-}
-
-#pragma mark - public
-
-- (NSString *)reuseIdentifierForCellClass:(Class)cellClass {
-    NSString *identifier = NSStringFromClass(cellClass);
-    if (![_reuseSet containsObject:identifier]) {
-        NSString *path = [[NSBundle mainBundle] pathForResource:identifier ofType:@"nib"];
-        if (path) {
-            [self registerNib:[UINib nibWithNibName:identifier bundle:nil] forCellWithReuseIdentifier:identifier];
-        } else {
-            [self registerClass:cellClass forCellWithReuseIdentifier:identifier];
-        }
-        [_reuseSet addObject:identifier];
-    }
-    return identifier;
-}
-
-- (UICollectionViewCell *)centerCell {
-    NSArray<UICollectionViewCell *> *cells = [self visibleCells];
-    if (cells.count == 0) return nil;
-    
-    UICollectionViewCell *res = cells[0];
-    CGFloat centerX = self.contentOffset.x + (self.bounds.size.width / 2.0);
-    for (int i = 1; i < cells.count; ++i) {
-        if (ABS(cells[i].center.x - centerX) < ABS(res.center.x - centerX)) {
-            res = cells[i];
-        }
-    }
-    return res;
-}
-
-- (void)scrollToPage:(NSInteger)page {
-    [self setContentOffset:CGPointMake(self.bounds.size.width * page, 0)];
-}
-
-#pragma mark - hit test
-
-- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
-    UIView *view = [super hitTest:point withEvent:event];
-    // When the hit-test view is 'UISlider', set '_scrollEnabled' to 'NO', avoid gesture conflicts.
-    self.scrollEnabled = ![view isKindOfClass:UISlider.class];
-    return view;
-}
-
-@end
-//
-//  YBIBCollectionViewLayout.h
-//  YBImageBrowserDemo
-//
-//  Created by 杨少 on 2018/4/17.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-@interface YBIBCollectionViewLayout : UICollectionViewFlowLayout
-
-@property (nonatomic, assign) CGFloat distanceBetweenPages;
-
-@end
-
-//
-//  YBIBCollectionViewLayout.m
-//  YBImageBrowserDemo
-//
-//  Created by 杨少 on 2018/4/17.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import "YBIBCollectionViewLayout.h"
-
-@implementation YBIBCollectionViewLayout
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        self.minimumLineSpacing = 0;
-        self.minimumInteritemSpacing = 0;
-        self.sectionInset = UIEdgeInsetsZero;
-        self.scrollDirection = UICollectionViewScrollDirectionHorizontal;
-        _distanceBetweenPages = 20;
-    }
-    return self;
-}
-
-- (void)prepareLayout {
-    [super prepareLayout];
-    self.itemSize = self.collectionView.bounds.size;
-}
-
-- (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect {
-    NSArray<UICollectionViewLayoutAttributes *> *layoutAttsArray = [[NSArray alloc] initWithArray:[super layoutAttributesForElementsInRect:rect] copyItems:YES];
-    CGFloat halfWidth = self.collectionView.bounds.size.width / 2.0;
-    CGFloat centerX = self.collectionView.contentOffset.x + halfWidth;
-    [layoutAttsArray enumerateObjectsUsingBlock:^(UICollectionViewLayoutAttributes * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
-        obj.center = CGPointMake(obj.center.x + (obj.center.x - centerX) / halfWidth * self.distanceBetweenPages / 2, obj.center.y);
-    }];
-    return layoutAttsArray;
-}
-
-- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds {
-    return YES;
-}
-
-@end
-//
-//  YBIBContainerView.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/7/11.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface YBIBContainerView : UIView
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBContainerView.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/7/11.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import "YBIBContainerView.h"
-
-@implementation YBIBContainerView
-
-- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
-    UIView *originView = [super hitTest:point withEvent:event];
-    if ([originView isKindOfClass:self.class]) {
-        // Continue hit-testing if the view is kind of 'self.class'.
-        return nil;
-    }
-    return originView;
-}
-
-@end
-//
-//  YBIBDataMediator.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/6.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBImageBrowser.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface YBIBDataMediator : NSObject
-
-- (instancetype)initWithBrowser:(YBImageBrowser *)browser;
-
-@property (nonatomic, assign) NSUInteger dataCacheCountLimit;
-
-- (NSInteger)numberOfCells;
-
-- (id<YBIBDataProtocol>)dataForCellAtIndex:(NSInteger)index;
-
-- (void)clear;
-
-@property (nonatomic, assign) NSUInteger preloadCount;
-
-- (void)preloadWithPage:(NSInteger)page;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBDataMediator.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/6.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBDataMediator.h"
-#import "YBImageBrowser+Internal.h"
-
-@implementation YBIBDataMediator {
-    __weak YBImageBrowser *_browser;
-    NSCache<NSNumber *, id<YBIBDataProtocol>> *_dataCache;
-}
-
-#pragma mark - life cycle
-
-- (instancetype)initWithBrowser:(YBImageBrowser *)browser {
-    if (self = [super init]) {
-        _browser = browser;
-        _dataCache = [NSCache new];
-    }
-    return self;
-}
-
-#pragma mark - public
-
-- (NSInteger)numberOfCells {
-    return _browser.dataSource ? [_browser.dataSource yb_numberOfCellsInImageBrowser:_browser] : _browser.dataSourceArray.count;
-}
-
-- (id<YBIBDataProtocol>)dataForCellAtIndex:(NSInteger)index {
-    if (index < 0 || index > self.numberOfCells - 1) return nil;
-    
-    id<YBIBDataProtocol> data = [_dataCache objectForKey:@(index)];
-    if (!data) {
-        data = _browser.dataSource ? [_browser.dataSource yb_imageBrowser:_browser dataForCellAtIndex:index] : _browser.dataSourceArray[index];
-        [_dataCache setObject:data forKey:@(index)];
-        [_browser implementGetBaseInfoProtocol:data];
-    }
-    return data;
-}
-
-- (void)clear {
-    [_dataCache removeAllObjects];
-}
-
-- (void)preloadWithPage:(NSInteger)page {
-    if (_preloadCount == 0) return;
-    
-    NSInteger left = -(_preloadCount / 2), right = _preloadCount - ABS(left);
-    for (NSInteger i = left; i <= right; ++i) {
-        if (i == 0) continue;
-        id<YBIBDataProtocol> targetData = [self dataForCellAtIndex:page + i];
-        if ([targetData respondsToSelector:@selector(yb_preload)]) {
-            [targetData yb_preload];
-        }
-    }
-}
-
-#pragma mark - getters & setters
-
-- (void)setDataCacheCountLimit:(NSUInteger)dataCacheCountLimit {
-    _dataCacheCountLimit = dataCacheCountLimit;
-    _dataCache.countLimit = dataCacheCountLimit;
-}
-
-@end
-//
-//  YBIBScreenRotationHandler.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/8.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBImageBrowser.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface YBIBScreenRotationHandler : NSObject
-
-- (instancetype)initWithBrowser:(YBImageBrowser *)browser;
-
-- (void)startObserveStatusBarOrientation;
-
-- (void)startObserveDeviceOrientation;
-
-- (void)clear;
-
-- (void)configContainerSize:(CGSize)size;
-
-- (CGSize)containerSizeWithOrientation:(UIDeviceOrientation)orientation;
-
-@property (nonatomic, assign, readonly, getter=isRotating) BOOL rotating;
-
-@property (nonatomic, assign, readonly) UIDeviceOrientation currentOrientation;
-
-@property (nonatomic, assign) UIInterfaceOrientationMask supportedOrientations;
-
-@property (nonatomic, assign) NSTimeInterval rotationDuration;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBScreenRotationHandler.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/8.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBScreenRotationHandler.h"
-#import "YBIBUtilities.h"
-#import "YBIBCellProtocol.h"
-#import "YBImageBrowser+Internal.h"
-
-BOOL YBIBValidDeviceOrientation(UIDeviceOrientation orientation) {
-    static NSSet *validSet;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        validSet = [NSSet setWithObjects:@(UIDeviceOrientationPortrait), @(UIDeviceOrientationPortraitUpsideDown), @(UIDeviceOrientationLandscapeLeft), @(UIDeviceOrientationLandscapeRight), nil];
-    });
-    return [validSet containsObject:@(orientation)];
-}
-
-CGFloat YBIBRotationAngle(UIDeviceOrientation startOrientation, UIDeviceOrientation endOrientation) {
-    static NSDictionary<NSNumber*, NSNumber*> *angleMap;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        angleMap = @{@(UIDeviceOrientationPortrait):@(0), @(UIDeviceOrientationPortraitUpsideDown):@(M_PI), @(UIDeviceOrientationLandscapeLeft):@(M_PI_2), @(UIDeviceOrientationLandscapeRight): @(-M_PI_2)};
-    });
-    NSNumber *start = angleMap[@(startOrientation)], *end = angleMap[@(endOrientation)];
-    CGFloat res = CGFLOAT_IS_DOUBLE ? end.doubleValue - start.doubleValue : end.floatValue - start.floatValue;
-    if (ABS(res) > M_PI) {
-        return res > 0 ? res - M_PI * 2 : M_PI * 2 + res;
-    }
-    return res;
-}
-
-
-static NSUInteger const kMaskNull = 10000;
-
-@interface YBIBScreenRotationHandler ()
-@property (nonatomic, assign) BOOL rotating;
-@property (nonatomic, assign) UIDeviceOrientation currentOrientation;
-@end
-
-@implementation YBIBScreenRotationHandler {
-    __weak YBImageBrowser *_browser;
-    CGSize _verticalContainerSize;
-    CGSize _horizontalContainerSize;
-    NSInteger _recordPage;
-}
-
-#pragma mark - life cycle
-
-- (void)dealloc {
-    [self clear];
-}
-
-- (instancetype)initWithBrowser:(YBImageBrowser *)browser {
-    if (self = [super init]) {
-        _browser = browser;
-        _rotating = NO;
-        _supportedOrientations = UIInterfaceOrientationMaskAllButUpsideDown;
-        _rotationDuration = 0.25;
-    }
-    return self;
-}
-
-#pragma mark - public
-
-- (void)startObserveStatusBarOrientation {
-    self.currentOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
-    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidChangedStatusBarOrientationNotification:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
-    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillChangeStatusBarOrientationNotification:) name:UIApplicationWillChangeStatusBarOrientationNotification object:nil];
-}
-
-- (void)startObserveDeviceOrientation {
-    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChangeNotification:) name:UIDeviceOrientationDidChangeNotification object:nil];
-}
-
-- (void)clear {
-    [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
-- (void)configContainerSize:(CGSize)size {
-    if (UIDeviceOrientationIsLandscape(self.currentOrientation)) {
-        // Now is horizontal.
-        _verticalContainerSize = CGSizeMake(size.height, size.width);
-        _horizontalContainerSize = size;
-    } else {
-        // Now is vertical.
-        _verticalContainerSize = size;
-        _horizontalContainerSize = CGSizeMake(size.height, size.width);
-    }
-}
-
-- (CGSize)containerSizeWithOrientation:(UIDeviceOrientation)orientation {
-    return UIDeviceOrientationIsLandscape(orientation) ? _horizontalContainerSize : _verticalContainerSize;
-}
-
-#pragma mark - private
-
-- (BOOL)supportedOfOrientation:(UIDeviceOrientation)orientation {
-    if (!YBIBValidDeviceOrientation(orientation)) return NO;
-    NSMutableSet *set = [NSMutableSet set];
-    if (_supportedOrientations & UIInterfaceOrientationMaskPortrait) [set addObject:@(UIDeviceOrientationPortrait)];
-    if (_supportedOrientations & UIInterfaceOrientationMaskPortraitUpsideDown) [set addObject:@(UIDeviceOrientationPortraitUpsideDown)];
-    if (_supportedOrientations & UIInterfaceOrientationMaskLandscapeRight) [set addObject:@(UIDeviceOrientationLandscapeLeft)];
-    if (_supportedOrientations & UIInterfaceOrientationMaskLandscapeLeft) [set addObject:@(UIDeviceOrientationLandscapeRight)];
-    return [set containsObject:@(orientation)];
-}
-
-- (BOOL)supportedOnlyOneSystemOrientation {
-    UIInterfaceOrientationMask mask = [self supportSystemOrientationMask];
-    return mask == (mask & (-mask));
-}
-
-- (void)orientationWillChangeWithExpectOrientation:(UIDeviceOrientation)orientation centerCell:(UICollectionViewCell<YBIBCellProtocol> *)centerCell {
-    if ([centerCell respondsToSelector:@selector(yb_orientationWillChangeWithExpectOrientation:)]) {
-        [centerCell yb_orientationWillChangeWithExpectOrientation:orientation];
-    }
-    for (id<YBIBToolViewHandler> handler in _browser.toolViewHandlers) {
-        if ([handler respondsToSelector:@selector(yb_orientationWillChangeWithExpectOrientation:)]) {
-            [handler yb_orientationWillChangeWithExpectOrientation:orientation];
-        }
-    }
-}
-
-- (void)orientationChangeAnimationWithExpectOrientation:(UIDeviceOrientation)orientation centerCell:(UICollectionViewCell<YBIBCellProtocol> *)centerCell {
-    if ([centerCell respondsToSelector:@selector(yb_orientationChangeAnimationWithExpectOrientation:)]) {
-        [centerCell yb_orientationChangeAnimationWithExpectOrientation:orientation];
-        [centerCell layoutIfNeeded];    // Compatible with autolayout.
-    }
-    for (id<YBIBToolViewHandler> handler in _browser.toolViewHandlers) {
-        if ([handler respondsToSelector:@selector(yb_orientationChangeAnimationWithExpectOrientation:)]) {
-            [handler yb_orientationChangeAnimationWithExpectOrientation:orientation];
-        }
-    }
-}
-
-- (void)orientationDidChangedWithOrientation:(UIDeviceOrientation)orientation centerCell:(UICollectionViewCell<YBIBCellProtocol> *)centerCell {
-    if ([centerCell respondsToSelector:@selector(yb_orientationDidChangedWithOrientation:)]) {
-        [centerCell yb_orientationDidChangedWithOrientation:orientation];
-    }
-    for (id<YBIBToolViewHandler> handler in _browser.toolViewHandlers) {
-        if ([handler respondsToSelector:@selector(yb_orientationDidChangedWithOrientation:)]) {
-            [handler yb_orientationDidChangedWithOrientation:orientation];
-        }
-    }
-}
-
-#pragma mark - event
-
-- (void)deviceOrientationDidChangeNotification:(NSNotification *)note {
-    if (![self supportedOnlyOneSystemOrientation]) return;
-    if (_browser.isTransitioning || self.rotating) return;
-    
-    UIDeviceOrientation expectOrientation = [UIDevice currentDevice].orientation;
-    if (expectOrientation == self.currentOrientation || ![self supportedOfOrientation:expectOrientation]) return;
-    
-    self.rotating = YES;
-    
-    // Align.
-    [_browser.collectionView scrollToPage:_browser.currentPage];
-    // Record current page number before transforming.
-    NSInteger currentPage = _browser.currentPage;
-    
-    UIDeviceOrientation statusBarOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
-    CGFloat angleStatusBarToExpect = YBIBRotationAngle(statusBarOrientation, expectOrientation);
-    CGFloat angleCurrentToExpect = YBIBRotationAngle(_currentOrientation, expectOrientation);
-    CGRect expectBounds = (CGRect){CGPointZero, [self containerSizeWithOrientation:expectOrientation]};
-    UICollectionViewCell<YBIBCellProtocol> *centerCell = (UICollectionViewCell<YBIBCellProtocol> *)self->_browser.collectionView.centerCell;
-    // Animate smoothly if bigger rotation angle.
-    NSTimeInterval duration = self.rotationDuration * (ABS(angleCurrentToExpect) > M_PI_2 ? 2 : 1);
-
-    // 'collectionView' transformation.
-    self->_browser.collectionView.bounds = expectBounds;
-    self->_browser.collectionView.transform = CGAffineTransformMakeRotation(angleStatusBarToExpect);
-    centerCell.contentView.transform = CGAffineTransformMakeRotation(-angleCurrentToExpect);
-    
-    // Reset to prevent the page number change after transforming.
-    [self->_browser.collectionView scrollToPage:currentPage];
-    
-    [self orientationWillChangeWithExpectOrientation:expectOrientation centerCell:centerCell];
-    
-    [UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
-        
-        // Maybe the internal UI need to transform.
-        [self orientationChangeAnimationWithExpectOrientation:expectOrientation centerCell:centerCell];
-        
-        centerCell.contentView.bounds = expectBounds;
-        centerCell.contentView.transform = CGAffineTransformIdentity;
-        
-        self->_browser.containerView.bounds = expectBounds;
-        self->_browser.containerView.transform = CGAffineTransformMakeRotation(angleStatusBarToExpect);
-        
-    } completion:^(BOOL finished) {
-        self.currentOrientation = expectOrientation;
-        self.rotating = NO;
-        
-        [self orientationDidChangedWithOrientation:expectOrientation centerCell:centerCell];
-    }];
-}
-
-- (void)applicationWillChangeStatusBarOrientationNotification:(NSNotification *)noti {
-    if ([self supportedOnlyOneSystemOrientation]) return;
-    
-    self.rotating = YES;
-    // Record current page number before transforming.
-    _recordPage = _browser.currentPage;
-    
-    UICollectionViewCell<YBIBCellProtocol> *centerCell = (UICollectionViewCell<YBIBCellProtocol> *)self->_browser.collectionView.centerCell;
-    UIDeviceOrientation expectOrientation = ((NSNumber *)noti.userInfo[UIApplicationStatusBarOrientationUserInfoKey]).integerValue;
-    [self orientationWillChangeWithExpectOrientation:expectOrientation centerCell:centerCell];
-}
-
-- (void)applicationDidChangedStatusBarOrientationNotification:(NSNotification *)noti {
-    if ([self supportedOnlyOneSystemOrientation]) return;
-    
-    UIDeviceOrientation expectOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
-    UICollectionViewCell<YBIBCellProtocol> *centerCell = (UICollectionViewCell<YBIBCellProtocol> *)self->_browser.collectionView.centerCell;
-    
-    [self orientationChangeAnimationWithExpectOrientation:expectOrientation centerCell:centerCell];
-    
-    CGRect expectBounds = (CGRect){CGPointZero, [self containerSizeWithOrientation:expectOrientation]};
-    self->_browser.collectionView.layout.itemSize = expectBounds.size;
-    
-    // Reset to prevent the page number change after transforming.
-    [_browser.collectionView scrollToPage:_recordPage];
-    
-    self.currentOrientation = expectOrientation;
-    self.rotating = NO;
-    
-    [self orientationDidChangedWithOrientation:expectOrientation centerCell:centerCell];
-}
-
-#pragma mark - getters & setters
-
-- (void)setRotating:(BOOL)rotating {
-    _rotating = rotating;
-    _browser.containerView.userInteractionEnabled = !rotating;
-    _browser.collectionView.userInteractionEnabled = !rotating;
-    _browser.collectionView.panGestureRecognizer.enabled = !rotating;
-}
-
-#pragma mark - calculate supported orientation of system
-
-- (UIInterfaceOrientationMask)supportSystemOrientationMask {
-    UIInterfaceOrientationMask limitMask = 0;
-    // IphoneX series do not support UIInterfaceOrientationMaskPortraitUpsideDown, except selector '-application:supportedInterfaceOrientationsForWindow:' of '[UIApplication sharedApplication].delegate' return 0. Maybe it is BUG of Apple.
-    BOOL ignoreUpsideDownIfIphoneX = YES;
-    UIInterfaceOrientationMask delegateMask = [self maskOfApplicationDelegate];
-    if (delegateMask != kMaskNull) {
-        if (delegateMask == 0) {
-            // Apple do.
-            limitMask = UIInterfaceOrientationMaskAll;
-            ignoreUpsideDownIfIphoneX = NO;
-        } else {
-            limitMask = delegateMask;
-        }
-    } else {
-        // Lower priority.
-        limitMask = [self maskOfInfoPlist];
-    }
-    
-    UIInterfaceOrientationMask supportMask = limitMask & [self maskOfViewController];
-    
-    if (ignoreUpsideDownIfIphoneX && YBIBIsIphoneXSeries() && (supportMask & UIInterfaceOrientationMaskPortraitUpsideDown)) {
-        supportMask ^= UIInterfaceOrientationMaskPortraitUpsideDown;
-    }
-    return supportMask;
-}
-
-- (UIInterfaceOrientationMask)maskOfInfoPlist {
-    // 'Info.plist' will not change in a process.
-    static UIInterfaceOrientationMask mask = 0;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        NSString *path = [[NSBundle mainBundle] pathForResource:@"Info" ofType:@"plist"];
-        NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithContentsOfFile:path];
-        NSArray *array = dict[@"UISupportedInterfaceOrientations"];
-        NSSet *set = [NSSet setWithArray:array];
-        if ([set containsObject:@"UIInterfaceOrientationPortrait"]) mask |= UIInterfaceOrientationMaskPortrait;
-        if ([set containsObject:@"UIInterfaceOrientationLandscapeRight"]) mask |= UIInterfaceOrientationMaskLandscapeRight;
-        if ([set containsObject:@"UIInterfaceOrientationLandscapeLeft"]) mask |= UIInterfaceOrientationMaskLandscapeLeft;
-        if ([set containsObject:@"UIInterfaceOrientationPortraitUpsideDown"]) mask |= UIInterfaceOrientationMaskPortraitUpsideDown;
-    });
-    return mask == 0 ? kMaskNull : mask;
-}
-
-- (UIInterfaceOrientationMask)maskOfApplicationDelegate {
-    UIInterfaceOrientationMask mask = kMaskNull;
-    id<UIApplicationDelegate> delegate = [UIApplication sharedApplication].delegate;
-    if ([delegate respondsToSelector:@selector(application:supportedInterfaceOrientationsForWindow:)]) {
-        mask = [delegate application:[UIApplication sharedApplication] supportedInterfaceOrientationsForWindow:_browser.window];
-    }
-    return mask;
-}
-
-- (UIInterfaceOrientationMask)maskOfViewController {
-    UIInterfaceOrientationMask mask = kMaskNull;
-    
-    // Find the UIViewController whitch 'browser' followed.
-    UIViewController *target = nil;
-    id next = _browser;
-    while (next) {
-        if ([next isKindOfClass:UIViewController.self]) {
-            target = next;
-            break;
-        }
-        if ([next isKindOfClass:UIWindow.self]) {
-            target = YBIBTopControllerByWindow(next);
-            break;
-        }
-        next = [next nextResponder];
-    }
-    
-    // Cover directly.
-    if (target.tabBarController) {
-        mask = target.tabBarController.shouldAutorotate ? target.tabBarController.supportedInterfaceOrientations : 0;
-    } else if (target.navigationController) {
-        mask = target.navigationController.shouldAutorotate ? target.navigationController.supportedInterfaceOrientations : 0;
-    } else {
-        mask = target.shouldAutorotate ? target.supportedInterfaceOrientations : 0;
-    }
-    return mask;
-}
-
-@end
-//
-//  YBImageBrowser+Internal.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/7/1.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import "YBImageBrowser.h"
-#import "YBIBContainerView.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface YBImageBrowser ()
-
-@property (nonatomic, strong) YBIBContainerView *containerView;
-
-- (void)implementGetBaseInfoProtocol:(id<YBIBGetBaseInfoProtocol>)obj;
-
-@property (nonatomic, weak, nullable) NSObject *hiddenProjectiveView;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBCopywriter.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/9/13.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import <Foundation/Foundation.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-typedef NS_ENUM(NSInteger, YBIBCopywriterType) {
-    /// 简体中文
-    YBIBCopywriterTypeSimplifiedChinese,
-    /// 英文
-    YBIBCopywriterTypeEnglish
-};
-
-/**
- 文案管理类
- */
-@interface YBIBCopywriter : NSObject
-
-/**
- 唯一有效单例
- */
-+ (instancetype)sharedCopywriter;
-
-/// 语言类型
-@property (nonatomic, assign) YBIBCopywriterType type;
-
-#pragma - 以下文案可更改
-
-@property (nonatomic, copy) NSString *videoIsInvalid;
-
-@property (nonatomic, copy) NSString *videoError;
-
-@property (nonatomic, copy) NSString *unableToSave;
-
-@property (nonatomic, copy) NSString *imageIsInvalid;
-
-@property (nonatomic, copy) NSString *downloadFailed;
-
-@property (nonatomic, copy) NSString *getPhotoAlbumAuthorizationFailed;
-
-@property (nonatomic, copy) NSString *saveToPhotoAlbumSuccess;
-
-@property (nonatomic, copy) NSString *saveToPhotoAlbumFailed;
-
-@property (nonatomic, copy) NSString *saveToPhotoAlbum;
-
-@property (nonatomic, copy) NSString *cancel;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBCopywriter.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/9/13.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import "YBIBCopywriter.h"
-
-@implementation YBIBCopywriter
-
-#pragma mark - life cycle
-
-+ (instancetype)sharedCopywriter {
-    static YBIBCopywriter *copywriter = nil;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        copywriter = [YBIBCopywriter new];
-    });
-    return copywriter;
-}
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        _type = YBIBCopywriterTypeSimplifiedChinese;
-        NSArray *appleLanguages = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleLanguages"];
-        if (appleLanguages && appleLanguages.count > 0) {
-            NSString *languages = appleLanguages[0];
-            if (![languages hasPrefix:@"zh-Hans"]) {
-                _type = YBIBCopywriterTypeEnglish;
-            }
-        }
-        
-        [self initCopy];
-    }
-    return self;
-}
-
-#pragma mark - private
-
-- (void)initCopy {
-    BOOL en = self.type == YBIBCopywriterTypeEnglish;
-    
-    self.videoIsInvalid = en ? @"Video is invalid" : @"视频无效";
-    self.videoError = en ? @"Video error" : @"视频错误";
-    self.unableToSave = en ? @"Unable to save" : @"无法保存";
-    self.imageIsInvalid = en ? @"Image is invalid" : @"图片无效";
-    self.downloadFailed = en ? @"Download failed" : @"加载图片失败";
-    self.getPhotoAlbumAuthorizationFailed = en ? @"Failed to get album authorization" : @"获取相册权限失败";
-    self.saveToPhotoAlbumSuccess = en ? @"Save successful" : @"已保存到系统相册";
-    self.saveToPhotoAlbumFailed = en ? @"Save failed" : @"保存失败";
-    self.saveToPhotoAlbum = en ? @"Save" : @"保存到相册";
-    self.cancel = en ? @"Cancel" : @"取消";
-}
-
-#pragma mark - public
-
-- (void)setType:(YBIBCopywriterType)type {
-    _type = type;
-    [self initCopy];
-}
-
-@end
-//
-//  YBIBIconManager.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/8/29.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface UIImage (YBImageBrowser)
-
-/**
- 获取图片便利构造方法
-
- @param name 图片名字
- @param bundle 资源对象
- @return 图片实例
- */
-+ (instancetype)ybib_imageNamed:(NSString *)name bundle:(NSBundle *)bundle;
-
-@end
-
-
-/// 获取图片闭包
-typedef UIImage * _Nullable (^YBIBIconBlock)(void);
-
-/**
- 图标管理类
- */
-@interface YBIBIconManager : NSObject
-
-/**
- 唯一有效单例
- */
-+ (instancetype)sharedManager;
-
-#pragma - 以下图片可更改
-
-/// 基本-加载
-@property (nonatomic, copy) YBIBIconBlock loadingImage;
-
-/// 工具视图-保存
-@property (nonatomic, copy) YBIBIconBlock toolSaveImage;
-/// 工具视图-更多
-@property (nonatomic, copy) YBIBIconBlock toolMoreImage;
-
-/// 视频-播放
-@property (nonatomic, copy) YBIBIconBlock videoPlayImage;
-/// 视频-暂停
-@property (nonatomic, copy) YBIBIconBlock videoPauseImage;
-/// 视频-取消
-@property (nonatomic, copy) YBIBIconBlock videoCancelImage;
-/// 视频-播放大图
-@property (nonatomic, copy) YBIBIconBlock videoBigPlayImage;
-/// 视频-拖动圆点
-@property (nonatomic, copy) YBIBIconBlock videoDragCircleImage;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBIconManager.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/8/29.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import "YBIBIconManager.h"
-
-// The best order for path scale search.
-static NSArray *_NSBundlePreferredScales() {
-    static NSArray *scales;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        CGFloat screenScale = [UIScreen mainScreen].scale;
-        if (screenScale <= 1) {
-            scales = @[@1,@2,@3];
-        } else if (screenScale <= 2) {
-            scales = @[@2,@3,@1];
-        } else {
-            scales = @[@3,@2,@1];
-        }
-    });
-    return scales;
-}
-
-// Add scale modifier to the file name (without path extension), from @"name" to @"name@2x".
-static NSString *_NSStringByAppendingNameScale(NSString *string, CGFloat scale) {
-    if (!string) return nil;
-    if (fabs(scale - 1) <= __FLT_EPSILON__ || string.length == 0 || [string hasSuffix:@"/"]) return string.copy;
-    return [string stringByAppendingFormat:@"@%@x", @(scale)];
-}
-
-@implementation UIImage (YBImageBrowser)
-
-+ (instancetype)ybib_imageNamed:(NSString *)name bundle:(NSBundle *)bundle {
-    if (name.length == 0) return nil;
-    if ([name hasSuffix:@"/"]) return nil;
-    
-    NSString *res = name.stringByDeletingPathExtension;
-    NSString *ext = name.pathExtension;
-    NSString *path = nil;
-    CGFloat scale = 1;
-    
-    // If no extension, guess by system supported (same as UIImage).
-    NSArray *exts = ext.length > 0 ? @[ext] : @[@"", @"png", @"jpeg", @"jpg", @"gif", @"webp", @"apng"];
-    NSArray *scales = _NSBundlePreferredScales();
-    for (int s = 0; s < scales.count; s++) {
-        scale = ((NSNumber *)scales[s]).floatValue;
-        NSString *scaledName = _NSStringByAppendingNameScale(res, scale);
-        for (NSString *e in exts) {
-            path = [bundle pathForResource:scaledName ofType:e];
-            if (path) break;
-        }
-        if (path) break;
-    }
-    if (path.length == 0) {
-        // Assets.xcassets supported.
-        return [self imageNamed:name];
-    }
-    
-    NSData *data = [NSData dataWithContentsOfFile:path];
-    if (data.length == 0) return nil;
-    
-    return [[self alloc] initWithData:data scale:scale];
-}
-
-@end
-
-
-NSBundle *YBIBDefaultBundle(void) {
-    static NSBundle *bundle = nil;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        NSBundle *_bundle = [NSBundle bundleForClass:NSClassFromString(@"YBImageBrowser")];
-        NSString *path = [_bundle pathForResource:@"YBImageBrowser" ofType:@"bundle"];
-        bundle = [NSBundle bundleWithPath:path];
-    });
-    return bundle;
-}
-
-NSBundle *YBIBVideoBundle(void) {
-    static NSBundle *bundle = nil;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        NSBundle *_bundle = [NSBundle bundleForClass:NSClassFromString(@"YBImageBrowser")];
-        NSString *path = [_bundle pathForResource:@"YBImageBrowserVideo" ofType:@"bundle"];
-        bundle = [NSBundle bundleWithPath:path];
-    });
-    return bundle;
-}
-
-@implementation YBIBIconManager
-
-+ (instancetype)sharedManager {
-    static YBIBIconManager *manager = nil;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        manager = [YBIBIconManager new];
-    });
-    return manager;
-}
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        _loadingImage = ^UIImage * _Nullable{
-            return [UIImage ybib_imageNamed:@"ybib_loading" bundle:YBIBDefaultBundle()];
-        };
-        
-        _toolSaveImage = ^UIImage * _Nullable{
-            return [UIImage ybib_imageNamed:@"ybib_save" bundle:YBIBDefaultBundle()];
-        };
-        _toolMoreImage = ^UIImage * _Nullable{
-            return [UIImage ybib_imageNamed:@"ybib_more" bundle:YBIBDefaultBundle()];
-        };
-        
-        _videoPlayImage = ^UIImage * _Nullable{
-            return [UIImage ybib_imageNamed:@"ybib_play" bundle:YBIBVideoBundle()];
-        };
-        _videoPauseImage = ^UIImage * _Nullable{
-            return [UIImage ybib_imageNamed:@"ybib_pause" bundle:YBIBVideoBundle()];
-        };
-        _videoCancelImage = ^UIImage * _Nullable{
-            return [UIImage ybib_imageNamed:@"ybib_cancel" bundle:YBIBVideoBundle()];
-        };
-        _videoBigPlayImage = ^UIImage * _Nullable{
-            return [UIImage ybib_imageNamed:@"ybib_bigPlay" bundle:YBIBVideoBundle()];
-        };
-        _videoDragCircleImage = ^UIImage * _Nullable{
-            return [UIImage ybib_imageNamed:@"ybib_circlePoint" bundle:YBIBVideoBundle()];
-        };
-    }
-    return self;
-}
-
-@end
-//
-//  YBIBPhotoAlbumManager.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/8/28.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import <Photos/Photos.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface YBIBPhotoAlbumManager : NSObject
-
-/**
- Get photo album authorization.
- */
-+ (void)getPhotoAlbumAuthorizationSuccess:(void(^)(void))success failed:(void(^)(void))failed;
-
-/**
- Get 'AVAsset' by 'PHAsset' asynchronously, callback is in child thread.
- */
-+ (void)getAVAssetWithPHAsset:(PHAsset *)phAsset completion:(void(^)(AVAsset * _Nullable asset))completion;
-
-/**
- Get 'ImageData' by 'PHAsset' synchronously, callback is in child thread.
- */
-+ (void)getImageDataWithPHAsset:(PHAsset *)phAsset completion:(void(^)(NSData * _Nullable data))completion;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBPhotoAlbumManager.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/8/28.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import "YBIBPhotoAlbumManager.h"
-#import "YBIBUtilities.h"
-
-@implementation YBIBPhotoAlbumManager
-
-+ (void)getAVAssetWithPHAsset:(PHAsset *)phAsset completion:(nonnull void (^)(AVAsset * _Nullable))completion {
-    PHVideoRequestOptions *options = [PHVideoRequestOptions new];
-    options.networkAccessAllowed = YES;
-    [[PHImageManager defaultManager] requestAVAssetForVideo:phAsset options:options resultHandler:^(AVAsset * _Nullable asset, AVAudioMix * _Nullable audioMix, NSDictionary * _Nullable info) {
-        completion(asset);
-    }];
-}
-
-+ (void)getImageDataWithPHAsset:(PHAsset *)phAsset completion:(nonnull void (^)(NSData * _Nullable))completion {
-    PHImageRequestOptions *options = [PHImageRequestOptions new];
-    options.networkAccessAllowed = YES;
-    options.resizeMode = PHImageRequestOptionsResizeModeNone;
-    // Only when this property is YES, the callback will in child thread.
-    options.synchronous = YES;
-    [[PHImageManager defaultManager] requestImageDataForAsset:phAsset options:options resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
-        BOOL complete = ![[info objectForKey:PHImageCancelledKey] boolValue] && ![info objectForKey:PHImageErrorKey] && ![[info objectForKey:PHImageResultIsDegradedKey] boolValue];
-        if (complete && imageData) {
-            completion(imageData);
-        } else {
-            completion(nil);
-        }
-    }];
-}
-
-+ (void)getPhotoAlbumAuthorizationSuccess:(void(^)(void))success failed:(void(^)(void))failed {
-    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
-    switch (status) {
-        case PHAuthorizationStatusDenied:
-            if (failed) failed();
-            break;
-        case PHAuthorizationStatusRestricted:
-            if (failed) failed();
-            break;
-        case PHAuthorizationStatusNotDetermined: {
-            [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status){
-                YBIB_DISPATCH_ASYNC_MAIN(^{
-                    if (status == PHAuthorizationStatusAuthorized) {
-                        if (success) success();
-                    } else {
-                        if (failed) failed();
-                    }
-                })
-            }];
-        }
-            break;
-        case PHAuthorizationStatusAuthorized:
-            if (success) success();
-            break;
-    }
-}
-
-@end
-//
-//  YBIBSentinel.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/18.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import <Foundation/Foundation.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-/**
- Thread safe.
- */
-@interface YBIBSentinel : NSObject
-
-/// Returns the current value of the counter.
-@property (readonly) int32_t value;
-
-/**
- Increase the value atomically.
- @return The new value.
- */
-- (int32_t)increase;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBSentinel.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/18.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBSentinel.h"
-#import <libkern/OSAtomic.h>
-
-@implementation YBIBSentinel {
-    int32_t _value;
-}
-
-- (int32_t)value {
-    return _value;
-}
-
-- (int32_t)increase {
-    return OSAtomicIncrement32(&_value);
-}
-
-@end
-//
-//  YBIBUtilities.h
-//  YBImageBrowserDemo
-//
-//  Created by 杨少 on 2018/4/11.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-
-#define YBIB_DISPATCH_ASYNC(queue, block)\
-if (strcmp(dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL), dispatch_queue_get_label(queue)) == 0) {\
-block();\
-} else {\
-dispatch_async(queue, block);\
-}
-
-#define YBIB_DISPATCH_ASYNC_MAIN(block) YBIB_DISPATCH_ASYNC(dispatch_get_main_queue(), block)
-
-
-#define YBIB_CODE_EXEC_TIME(KEY, ...) \
-CFAbsoluteTime startTime = CFAbsoluteTimeGetCurrent(); \
-__VA_ARGS__ \
-CFAbsoluteTime linkTime = (CFAbsoluteTimeGetCurrent() - startTime); \
-NSLog(@"%@ Time-Consuming: %fms", KEY, linkTime * 1000.0);
-
-
-UIWindow * _Nonnull YBIBNormalWindow(void);
-
-UIViewController * _Nullable YBIBTopController(void);
-UIViewController * _Nullable YBIBTopControllerByWindow(UIWindow *);
-
-BOOL YBIBLowMemory(void);
-
-BOOL YBIBIsIphoneXSeries(void);
-CGFloat YBIBStatusbarHeight(void);
-CGFloat YBIBSafeAreaBottomHeight(void);
-
-UIImage *YBIBSnapshotView(UIView *);
-
-/// This is orientation of 'YBImageBrowser' not 'UIDevice'.
-UIEdgeInsets YBIBPaddingByBrowserOrientation(UIDeviceOrientation);
-
-
-@interface YBIBUtilities : NSObject
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBUtilities.m
-//  YBImageBrowserDemo
-//
-//  Created by 杨少 on 2018/4/11.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import "YBIBUtilities.h"
-#import <sys/utsname.h>
-
-
-UIWindow * _Nullable YBIBNormalWindow(void) {
-    UIWindow *window = [[UIApplication sharedApplication] keyWindow];
-    if (window.windowLevel != UIWindowLevelNormal) {
-        NSArray *windows = [[UIApplication sharedApplication] windows];
-        for(UIWindow *temp in windows) {
-            if (temp.windowLevel == UIWindowLevelNormal) {
-                return temp;
-            }
-        }
-    }
-    return window;
-}
-
-UIViewController * _Nullable YBIBTopController(void) {
-    return YBIBTopControllerByWindow(YBIBNormalWindow());
-}
-
-UIViewController * _Nullable YBIBTopControllerByWindow(UIWindow *window) {
-    if (!window) return nil;
-        
-    UIViewController *top = nil;
-    id nextResponder;
-    if (window.subviews.count > 0) {
-        UIView *frontView = [window.subviews objectAtIndex:0];
-        nextResponder = frontView.nextResponder;
-    }
-    if (nextResponder && [nextResponder isKindOfClass:UIViewController.class]) {
-        top = nextResponder;
-    } else {
-        top = window.rootViewController;
-    }
-    
-    while ([top isKindOfClass:UITabBarController.class] || [top isKindOfClass:UINavigationController.class] || top.presentedViewController) {
-        if ([top isKindOfClass:UITabBarController.class]) {
-            top = ((UITabBarController *)top).selectedViewController;
-        } else if ([top isKindOfClass:UINavigationController.class]) {
-            top = ((UINavigationController *)top).topViewController;
-        } else if (top.presentedViewController) {
-            top = top.presentedViewController;
-        }
-    }
-    return top;
-}
-
-BOOL YBIBLowMemory(void) {
-    static BOOL lowMemory = NO;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        unsigned long long physicalMemory = [[NSProcessInfo processInfo] physicalMemory];
-        lowMemory = physicalMemory > 0 && physicalMemory < 1024 * 1024 * 1500;
-    });
-    return lowMemory;
-}
-
-BOOL YBIBIsIphoneXSeries(void) {
-    return YBIBStatusbarHeight() > 20;
-}
-
-CGFloat YBIBStatusbarHeight(void) {
-    CGFloat height = 0;
-    if (@available(iOS 11.0, *)) {
-        height = UIApplication.sharedApplication.delegate.window.safeAreaInsets.top;
-    }
-    if (height <= 0) {
-        height = UIApplication.sharedApplication.statusBarFrame.size.height;
-    }
-    if (height <= 0) {
-        height = 20;
-    }
-    return height;
-}
-
-CGFloat YBIBSafeAreaBottomHeight(void) {
-    CGFloat bottom = 0;
-    if (@available(iOS 11.0, *)) {
-        bottom = UIApplication.sharedApplication.delegate.window.safeAreaInsets.bottom;
-    }
-    return bottom;
-}
-
-UIImage *YBIBSnapshotView(UIView *view) {
-    UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, [UIScreen mainScreen].scale);
-    [view drawViewHierarchyInRect:view.bounds afterScreenUpdates:NO];
-    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
-    UIGraphicsEndImageContext();
-    return image;
-}
-
-UIEdgeInsets YBIBPaddingByBrowserOrientation(UIDeviceOrientation orientation) {
-    UIEdgeInsets padding = UIEdgeInsetsZero;
-    if (!YBIBIsIphoneXSeries()) return padding;
-    
-    UIDeviceOrientation barOrientation = (UIDeviceOrientation)UIApplication.sharedApplication.statusBarOrientation;
-    
-    if (UIDeviceOrientationIsLandscape(orientation)) {
-        BOOL same = orientation == barOrientation;
-        BOOL reverse = !same && UIDeviceOrientationIsLandscape(barOrientation);
-        if (same) {
-            padding.bottom = YBIBSafeAreaBottomHeight();
-            padding.top = 0;
-        } else if (reverse) {
-            padding.top = YBIBSafeAreaBottomHeight();
-            padding.bottom = 0;
-        }
-        padding.left = padding.right = MAX(YBIBSafeAreaBottomHeight(), YBIBStatusbarHeight());
-    } else {
-        if (orientation == UIDeviceOrientationPortrait) {
-            padding.top = YBIBStatusbarHeight();
-            padding.bottom = barOrientation == UIDeviceOrientationPortrait ? YBIBSafeAreaBottomHeight() : 0;
-        } else {
-            padding.bottom = YBIBStatusbarHeight();
-            padding.top = barOrientation == UIDeviceOrientationPortrait ? YBIBSafeAreaBottomHeight() : 0;
-        }
-        padding.left = padding.right = UIDeviceOrientationIsLandscape(barOrientation) ? YBIBSafeAreaBottomHeight() : 0 ;
-    }
-    return padding;
-}
-
-
-@implementation YBIBUtilities
-
-@end
-//
-//  YBIBImageCache+Internal.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/13.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBImageCache.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-typedef NS_ENUM(NSInteger, YBIBImageCacheType) {
-    YBIBImageCacheTypeOrigin,
-    YBIBImageCacheTypeCompressed
-};
-
-/**
- Not thread safe.
- */
-@interface YBIBImageCache ()
-
-- (void)setImage:(UIImage *)image type:(YBIBImageCacheType)type forKey:(NSString *)key resident:(BOOL)resident;
-
-- (nullable UIImage *)imageForKey:(NSString *)key type:(YBIBImageCacheType)type;
-
-- (void)removeForKey:(NSString *)key;
-
-- (void)removeResidentForKey:(NSString *)key;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBImageCache.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/13.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@class YBIBImageCache;
-
-@interface NSObject (YBIBImageCache)
-
-/// 图片浏览器持有的图片缓存管理类
-@property (nonatomic, strong, readonly) YBIBImageCache *ybib_imageCache;
-
-@end
-
-
-@interface YBIBImageCache : NSObject
-
-/// 缓存数量限制（一个单位表示一个 YBIBImageData 产生的所有图片数据）
-@property (nonatomic, assign) NSUInteger imageCacheCountLimit;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBImageCache.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/13.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBImageCache.h"
-#import "YBIBImageCache+Internal.h"
-#import "YBIBUtilities.h"
-#import <objc/runtime.h>
-
-
-@implementation NSObject (YBIBImageCache)
-static void *YBIBImageCacheKey = &YBIBImageCacheKey;
-- (void)setYbib_imageCache:(YBIBImageCache *)ybib_imageCache {
-    objc_setAssociatedObject(self, YBIBImageCacheKey, ybib_imageCache, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
-}
-- (YBIBImageCache *)ybib_imageCache {
-    YBIBImageCache *cache = objc_getAssociatedObject(self, YBIBImageCacheKey);
-    if (!cache) {
-        cache = [YBIBImageCache new];
-        self.ybib_imageCache = cache;
-    }
-    return cache;
-}
-@end
-
-
-@interface YBIBImageCachePack : NSObject
-@property (nonatomic, strong) UIImage *originImage;
-@property (nonatomic, strong) UIImage *compressedImage;
-@end
-@implementation YBIBImageCachePack
-@end
-
-
-@implementation YBIBImageCache {
-    NSCache<NSString *, YBIBImageCachePack *> *_imageCache;
-    NSMutableDictionary<NSString *, YBIBImageCachePack *> *_residentCache;
-}
-
-#pragma mark - life cycle
-
-- (void)dealloc {
-    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
-}
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        _imageCache = [NSCache new];
-        _imageCache.countLimit = _imageCacheCountLimit = YBIBLowMemory() ? 6 : 12;
-        _residentCache = [NSMutableDictionary dictionary];
-        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
-    }
-    return self;
-}
-
-#pragma mark - event
-
-- (void)didReceiveMemoryWarning:(NSNotification *)notification {
-    [_imageCache removeAllObjects];
-    [_residentCache removeAllObjects];
-}
-
-#pragma mark - public
-
-- (void)setImage:(UIImage *)image type:(YBIBImageCacheType)type forKey:(NSString *)key resident:(BOOL)resident {
-    YBIBImageCachePack *pack = [_imageCache objectForKey:key];
-    if (!pack) {
-        pack = [YBIBImageCachePack new];
-        [_imageCache setObject:pack forKey:key];
-    }
-    switch (type) {
-        case YBIBImageCacheTypeOrigin:
-            pack.originImage = image;
-            break;
-        case YBIBImageCacheTypeCompressed:
-            pack.compressedImage = image;
-            break;
-    }
-    [_residentCache setObject:pack forKey:key];
-}
-
-- (UIImage *)imageForKey:(NSString *)key type:(YBIBImageCacheType)type {
-    YBIBImageCachePack *pack = [_imageCache objectForKey:key] ?: [_residentCache objectForKey:key];
-    switch (type) {
-        case YBIBImageCacheTypeOrigin: return pack.originImage;
-        case YBIBImageCacheTypeCompressed: return pack.compressedImage;
-        default: return nil;
-    }
-}
-
-- (void)removeForKey:(NSString *)key {
-    [_imageCache removeObjectForKey:key];
-    [_residentCache removeObjectForKey:key];
-}
-
-- (void)removeResidentForKey:(NSString *)key {
-    [_residentCache removeObjectForKey:key];
-}
-
-#pragma mark - setter
-
-- (void)setImageCacheCountLimit:(NSUInteger)imageCacheCountLimit {
-    _imageCacheCountLimit = imageCacheCountLimit;
-    _imageCache.countLimit = imageCacheCountLimit;
-}
-
-@end
-//
-//  YBIBImageCell+Internal.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/12/23.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import "YBIBImageCell.h"
-#import "YBIBImageScrollView.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface YBIBImageCell ()
-
-@property (nonatomic, strong) YBIBImageScrollView *imageScrollView;
-
-@property (nonatomic, strong) UIImageView *tailoringImageView;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBImageCell.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/5.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBCellProtocol.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface YBIBImageCell : UICollectionViewCell <YBIBCellProtocol>
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBImageCell.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/5.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBImageCell.h"
-#import "YBIBImageData.h"
-#import "YBIBIconManager.h"
-#import "YBIBImageCell+Internal.h"
-#import "YBIBImageData+Internal.h"
-#import "YBIBCopywriter.h"
-#import "YBIBUtilities.h"
-
-@interface YBIBImageCell () <YBIBImageDataDelegate, UIScrollViewDelegate, UIGestureRecognizerDelegate>
-@end
-
-@implementation YBIBImageCell {
-    CGPoint _interactStartPoint;
-    BOOL _interacting;
-}
-
-#pragma mark - life cycle
-
-- (instancetype)initWithFrame:(CGRect)frame {
-    self = [super initWithFrame:frame];
-    if (self) {
-        [self initValue];
-        [self.contentView addSubview:self.imageScrollView];
-        [self addGesture];
-    }
-    return self;
-}
-
-- (void)layoutSubviews {
-    [super layoutSubviews];
-    self.imageScrollView.frame = self.bounds;
-}
-
-- (void)initValue {
-    _interactStartPoint = CGPointZero;
-    _interacting = NO;
-}
-
-- (void)prepareForReuse {
-    ((YBIBImageData *)self.yb_cellData).delegate = nil;
-    [self.imageScrollView reset];
-    [self hideTailoringImageView];
-    [self hideAuxiliaryView];
-    [super prepareForReuse];
-}
-
-#pragma mark - <YBIBCellProtocol>
-
-@synthesize yb_currentOrientation = _yb_currentOrientation;
-@synthesize yb_containerSize = _yb_containerSize;
-@synthesize yb_backView = _yb_backView;
-@synthesize yb_collectionView = _yb_collectionView;
-@synthesize yb_isTransitioning = _yb_isTransitioning;
-@synthesize yb_isRotating = _yb_isRotating;
-@synthesize yb_auxiliaryViewHandler = _yb_auxiliaryViewHandler;
-@synthesize yb_hideStatusBar = _yb_hideStatusBar;
-@synthesize yb_hideBrowser = _yb_hideBrowser;
-@synthesize yb_hideToolViews = _yb_hideToolViews;
-@synthesize yb_cellData = _yb_cellData;
-@synthesize yb_cellIsInCenter = _yb_cellIsInCenter;
-@synthesize yb_selfPage = _yb_selfPage;
-@synthesize yb_currentPage = _yb_currentPage;
-
-- (void)setYb_cellData:(id<YBIBDataProtocol>)yb_cellData {
-    _yb_cellData = yb_cellData;
-    ((YBIBImageData *)yb_cellData).delegate = self;
-}
-
-- (UIView *)yb_foregroundView {
-    return self.imageScrollView.imageView;
-}
-
-- (void)yb_orientationWillChangeWithExpectOrientation:(UIDeviceOrientation)orientation {
-    [self hideTailoringImageView];
-}
-
-- (void)yb_orientationChangeAnimationWithExpectOrientation:(UIDeviceOrientation)orientation {
-    [self updateImageLayoutWithOrientation:orientation previousImageSize:self.imageScrollView.imageView.image.size];
-}
-
-#pragma mark - private
-
-- (CGSize)contentSizeWithContainerSize:(CGSize)containerSize imageViewFrame:(CGRect)imageViewFrame {
-    return CGSizeMake(MAX(containerSize.width, imageViewFrame.size.width), MAX(containerSize.height, imageViewFrame.size.height));
-}
-
-- (void)updateImageLayoutWithOrientation:(UIDeviceOrientation)orientation previousImageSize:(CGSize)previousImageSize {
-    if (_interacting) [self restoreInteractionWithDuration:0];
-    
-    YBIBImageData *data = self.yb_cellData;
-    
-    CGSize imageSize;
-    
-    UIImage *image = self.imageScrollView.imageView.image;
-    YBIBScrollImageType imageType = self.imageScrollView.imageType;
-    if (imageType == YBIBScrollImageTypeCompressed) {
-        imageSize = data.originImage ? data.originImage.size : image.size;
-    } else {
-        imageSize = image.size;
-    }
-    
-    CGSize containerSize = self.yb_containerSize(orientation);
-    CGRect imageViewFrame = [data.layout yb_imageViewFrameWithContainerSize:containerSize imageSize:imageSize orientation:orientation];
-    CGSize contentSize = [self contentSizeWithContainerSize:containerSize imageViewFrame:imageViewFrame];
-    CGFloat maxZoomScale = imageType == YBIBScrollImageTypeThumb ? 1 : [data.layout yb_maximumZoomScaleWithContainerSize:containerSize imageSize:imageSize orientation:orientation];
-    
-    // 'zoomScale' must set before 'contentSize' and 'imageView.frame'.
-    self.imageScrollView.zoomScale = 1;
-    self.imageScrollView.contentSize = contentSize;
-    self.imageScrollView.minimumZoomScale = 1;
-    self.imageScrollView.maximumZoomScale = maxZoomScale;
-    
-    CGFloat scale;
-    if (previousImageSize.width > 0 && previousImageSize.height > 0) {
-        scale = imageSize.width / imageSize.height - previousImageSize.width / previousImageSize.height;
-    } else {
-        scale = 0;
-    }
-    // '0.001' is admissible error.
-    if (ABS(scale) <= 0.001) {
-        self.imageScrollView.imageView.frame = imageViewFrame;
-    } else {
-        [UIView animateWithDuration:0.25 animations:^{
-            self.imageScrollView.imageView.frame = imageViewFrame;
-        }];
-    }
-}
-
-- (void)cuttingImage {
-    // This method has been delayed called, so 'browser' may be in transit now.
-    if (self.yb_isTransitioning()) return;
-    if (_interacting) return;
-    
-    YBIBImageData *data = self.yb_cellData;
-    if (!data.originImage) return;
-    
-    if (self.imageScrollView.zoomScale < data.cuttingZoomScale) return;
-    
-    if ([data shouldCompress]) {
-        [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(cuttingImage_) object:nil];
-        [self performSelector:@selector(cuttingImage_) withObject:nil afterDelay:0.15];
-    }
-}
-- (void)cuttingImage_ {
-    YBIBImageData *data = self.yb_cellData;
-    if (!data.originImage) return;
-    
-    CGFloat scale = data.originImage.size.width / self.imageScrollView.contentSize.width;
-    CGFloat x = self.imageScrollView.contentOffset.x * scale,
-    y = self.imageScrollView.contentOffset.y * scale,
-    width = self.imageScrollView.bounds.size.width * scale,
-    height = self.imageScrollView.bounds.size.height * scale;
-    
-    __weak typeof(self) wSelf = self;
-    [data cuttingImageToRect:CGRectMake(x, y, width, height) complete:^(UIImage *image) {
-        if (!image) return;
-        YBIB_DISPATCH_ASYNC_MAIN(^{
-            __strong typeof(wSelf) self = wSelf;
-            if (!self) return;
-            if (data == self.yb_cellData && !self.imageScrollView.isDragging && !self->_interacting && !self.yb_isTransitioning()) {
-                [self showTailoringImageView:image];
-            }
-        })
-    }];
-}
-
-- (void)showTailoringImageView:(UIImage *)image {
-    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
-    if (!self.tailoringImageView.superview) {
-        [self.contentView addSubview:self.tailoringImageView];
-    }
-    self.tailoringImageView.frame = CGRectMake(0, 0, containerSize.width, containerSize.height);
-    self.tailoringImageView.hidden = NO;
-    self.tailoringImageView.image = image;
-}
-
-- (void)hideTailoringImageView {
-    // Don't use 'getter' method, because it's according to the need to load.
-    if (_tailoringImageView) {
-        self.tailoringImageView.hidden = YES;
-    }
-}
-
-- (void)hideAuxiliaryView {
-    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
-    [self.yb_auxiliaryViewHandler() yb_hideToastWithContainer:self];
-}
-
-- (void)hideBrowser {
-    ((YBIBImageData *)self.yb_cellData).delegate = nil;
-    [self hideTailoringImageView];
-    [self hideAuxiliaryView];
-    self.yb_hideBrowser();
-    _interacting = NO;
-}
-
-#pragma mark - <YBIBImageDataDelegate>
-
-- (void)yb_imageData:(YBIBImageData *)data startLoadingWithStatus:(YBIBImageLoadingStatus)status {
-    switch (status) {
-        case YBIBImageLoadingStatusDecoding: {
-            if (!self.imageScrollView.imageView.image) {
-                [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
-            }
-        }
-            break;
-        case YBIBImageLoadingStatusProcessing: {
-            if (!self.imageScrollView.imageView.image) {
-                [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
-            }
-        }
-            break;
-        case YBIBImageLoadingStatusCompressing: {
-            if (!self.imageScrollView.imageView.image) {
-                [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
-            }
-        }
-            break;
-        case YBIBImageLoadingStatusReadingPHAsset: {
-            if (!self.imageScrollView.imageView.image) {
-                [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self];
-            }
-        }
-            break;
-        case YBIBImageLoadingStatusNone: {
-            [self hideAuxiliaryView];
-        }
-            break;
-        default:
-            break;
-    }
-}
-
-- (void)yb_imageData:(YBIBImageData *)data readyForImage:(__kindof UIImage *)image {
-    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
-    if (self.imageScrollView.imageView.image == image) return;
-    
-    CGSize size = self.imageScrollView.imageView.image.size;
-    [self.imageScrollView setImage:image type:YBIBScrollImageTypeOriginal];
-    [self updateImageLayoutWithOrientation:self.yb_currentOrientation() previousImageSize:size];
-}
-
-- (void)yb_imageData:(YBIBImageData *)data readyForCompressedImage:(__kindof UIImage *)image {
-    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
-    if (self.imageScrollView.imageView.image == image) return;
-    
-    CGSize size = self.imageScrollView.imageView.image.size;
-    [self.imageScrollView setImage:image type:YBIBScrollImageTypeCompressed];
-    [self updateImageLayoutWithOrientation:self.yb_currentOrientation() previousImageSize:size];
-}
-
-- (void)yb_imageData:(YBIBImageData *)data readyForThumbImage:(__kindof UIImage *)image {
-    if (self.imageScrollView.imageView.image) return;
-    
-    [self.imageScrollView setImage:image type:YBIBScrollImageTypeThumb];
-    [self updateImageLayoutWithOrientation:self.yb_currentOrientation() previousImageSize:image.size];
-}
-
-- (void)yb_imageIsInvalidForData:(YBIBImageData *)data {
-    [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
-    NSString *imageIsInvalid = [YBIBCopywriter sharedCopywriter].imageIsInvalid;
-    if (self.imageScrollView.imageView.image) {
-        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self text:imageIsInvalid];
-    } else {
-        [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self text:imageIsInvalid];
-    }
-}
-
-- (void)yb_imageData:(YBIBImageData *)data downloadProgress:(CGFloat)progress {
-    [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self progress:progress];
-}
-
-- (void)yb_imageDownloadFailedForData:(YBIBImageData *)data {
-    if (self.imageScrollView.imageView.image) {
-        [self.yb_auxiliaryViewHandler() yb_hideLoadingWithContainer:self];
-        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self text:[YBIBCopywriter sharedCopywriter].downloadFailed];
-    } else {
-        [self.yb_auxiliaryViewHandler() yb_showLoadingWithContainer:self text:[YBIBCopywriter sharedCopywriter].downloadFailed];
-    }
-}
-
-#pragma mark - gesture
-
-- (void)addGesture {
-    UITapGestureRecognizer *tapSingle = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToTapSingle:)];
-    tapSingle.numberOfTapsRequired = 1;
-    UITapGestureRecognizer *tapDouble = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToTapDouble:)];
-    tapDouble.numberOfTapsRequired = 2;
-    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(respondsToPan:)];
-    pan.maximumNumberOfTouches = 1;
-    pan.delegate = self;
-    
-    [tapSingle requireGestureRecognizerToFail:tapDouble];
-    [tapSingle requireGestureRecognizerToFail:pan];
-    [tapDouble requireGestureRecognizerToFail:pan];
-    
-    [self addGestureRecognizer:tapSingle];
-    [self addGestureRecognizer:tapDouble];
-    [self addGestureRecognizer:pan];
-}
-
-- (void)respondsToTapSingle:(UITapGestureRecognizer *)tap {
-    if (self.yb_isRotating()) return;
-    
-    YBIBImageData *data = self.yb_cellData;
-    if (data.singleTouchBlock) {
-        data.singleTouchBlock(data);
-    } else {
-        [self hideTailoringImageView];
-        [self hideAuxiliaryView];
-        self.yb_hideBrowser();
-    }
-}
-
-- (void)respondsToTapDouble:(UITapGestureRecognizer *)tap {
-    if (self.yb_isRotating()) return;
-    
-    [self hideTailoringImageView];
-    
-    UIScrollView *scrollView = self.imageScrollView;
-    UIView *zoomView = [self viewForZoomingInScrollView:scrollView];
-    CGPoint point = [tap locationInView:zoomView];
-    if (!CGRectContainsPoint(zoomView.bounds, point)) return;
-    if (scrollView.zoomScale == scrollView.maximumZoomScale) {
-        [scrollView setZoomScale:1 animated:YES];
-    } else {
-        [scrollView zoomToRect:CGRectMake(point.x, point.y, 1, 1) animated:YES];
-    }
-}
-
-- (void)respondsToPan:(UIPanGestureRecognizer *)pan {
-    if (self.yb_isRotating()) return;
-    
-    YBIBInteractionProfile *profile = ((YBIBImageData *)self.yb_cellData).interactionProfile;
-    if (profile.disable) return;
-    if ((CGRectIsEmpty(self.imageScrollView.imageView.frame) || !self.imageScrollView.imageView.image)) return;
-    
-    CGPoint point = [pan locationInView:self];
-    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
-    
-    if (pan.state == UIGestureRecognizerStateBegan) {
-        _interactStartPoint = point;
-    } else if (pan.state == UIGestureRecognizerStateCancelled || pan.state == UIGestureRecognizerStateEnded || pan.state == UIGestureRecognizerStateRecognized || pan.state == UIGestureRecognizerStateFailed) {
-        
-        // End.
-        if (_interacting) {
-            CGPoint velocity = [pan velocityInView:self.imageScrollView];
-            
-            BOOL velocityArrive = ABS(velocity.y) > profile.dismissVelocityY;
-            BOOL distanceArrive = ABS(point.y - _interactStartPoint.y) > containerSize.height * profile.dismissScale;
-            
-            BOOL shouldDismiss = distanceArrive || velocityArrive;
-            if (shouldDismiss) {
-                [self hideBrowser];
-            } else {
-                [self restoreInteractionWithDuration:profile.restoreDuration];
-            }
-        }
-        
-    } else if (pan.state == UIGestureRecognizerStateChanged) {
-        if (_interacting) {
-
-            // Change.
-            self.imageScrollView.center = point;
-            CGFloat scale = 1 - ABS(point.y - _interactStartPoint.y) / (containerSize.height * 1.2);
-            if (scale > 1) scale = 1;
-            if (scale < 0.35) scale = 0.35;
-            self.imageScrollView.transform = CGAffineTransformMakeScale(scale, scale);
-
-            CGFloat alpha = 1 - ABS(point.y - _interactStartPoint.y) / (containerSize.height * 0.7);
-            if (alpha > 1) alpha = 1;
-            if (alpha < 0) alpha = 0;
-            self.yb_backView.backgroundColor = [self.yb_backView.backgroundColor colorWithAlphaComponent:alpha];
-
-        } else {
-
-            // Start.
-            if (CGPointEqualToPoint(_interactStartPoint, CGPointZero) || self.yb_currentPage() != self.yb_selfPage() || !self.yb_cellIsInCenter() || self.imageScrollView.isZooming) return;
-
-            CGPoint velocity = [pan velocityInView:self.imageScrollView];
-            CGFloat triggerDistance = profile.triggerDistance;
-            CGFloat offsetY = self.imageScrollView.contentOffset.y, height = self.imageScrollView.bounds.size.height;
-
-            BOOL distanceArrive = ABS(point.x - _interactStartPoint.x) < triggerDistance && ABS(velocity.x) < 500;
-            BOOL upArrive = point.y - _interactStartPoint.y > triggerDistance && offsetY <= 1;
-            BOOL downArrive = point.y - _interactStartPoint.y < -triggerDistance && offsetY + height >= MAX(self.imageScrollView.contentSize.height, height) - 1;
-
-            BOOL shouldStart = (upArrive || downArrive) && distanceArrive;
-            if (!shouldStart) return;
-
-            _interactStartPoint = point;
-
-            CGRect startFrame = self.imageScrollView.frame;
-            CGFloat anchorX = point.x / startFrame.size.width, anchorY = point.y / startFrame.size.height;
-            self.imageScrollView.layer.anchorPoint = CGPointMake(anchorX, anchorY);
-            self.imageScrollView.userInteractionEnabled = NO;
-            self.imageScrollView.scrollEnabled = NO;
-            self.imageScrollView.center = point;
-            
-            self.yb_hideToolViews(YES);
-            self.yb_hideStatusBar(NO);
-            self.yb_collectionView().scrollEnabled = NO;
-            [self hideTailoringImageView];
-
-            _interacting = YES;
-        }
-    }
-}
-
-- (void)restoreInteractionWithDuration:(NSTimeInterval)duration {
-    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
-    
-    void (^animations)(void) = ^{
-        self.yb_backView.backgroundColor = [self.yb_backView.backgroundColor colorWithAlphaComponent:1];
-        
-        CGPoint anchorPoint = self.imageScrollView.layer.anchorPoint;
-        self.imageScrollView.center = CGPointMake(containerSize.width * anchorPoint.x, containerSize.height * anchorPoint.y);
-        self.imageScrollView.transform = CGAffineTransformIdentity;
-    };
-    void (^completion)(BOOL finished) = ^(BOOL finished){
-        self.imageScrollView.layer.anchorPoint = CGPointMake(0.5, 0.5);
-        self.imageScrollView.center = CGPointMake(containerSize.width * 0.5, containerSize.height * 0.5);
-        self.imageScrollView.userInteractionEnabled = YES;
-        self.imageScrollView.scrollEnabled = YES;
-        
-        self.yb_hideToolViews(NO);
-        self.yb_hideStatusBar(YES);
-        self.yb_collectionView().scrollEnabled = YES;
-        [self cuttingImage];
-        
-        self->_interactStartPoint = CGPointZero;
-        self->_interacting = NO;
-    };
-    
-    if (duration <= 0) {
-        animations();
-        completion(NO);
-    } else {
-        [UIView animateWithDuration:duration animations:animations completion:completion];
-    }
-}
-
-#pragma mark - <UIScrollViewDelegate>
-
-- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
-    YBIBImageData *data = self.yb_cellData;
-    if (data.imageDidZoomBlock) {
-        data.imageDidZoomBlock(data, scrollView);
-    }
-    
-    CGRect imageViewFrame = self.imageScrollView.imageView.frame;
-    CGFloat width = imageViewFrame.size.width,
-    height = imageViewFrame.size.height,
-    sHeight = scrollView.bounds.size.height,
-    sWidth = scrollView.bounds.size.width;
-    if (height > sHeight) {
-        imageViewFrame.origin.y = 0;
-    } else {
-        imageViewFrame.origin.y = (sHeight - height) / 2.0;
-    }
-    if (width > sWidth) {
-        imageViewFrame.origin.x = 0;
-    } else {
-        imageViewFrame.origin.x = (sWidth - width) / 2.0;
-    }
-    self.imageScrollView.imageView.frame = imageViewFrame;
-}
-
-- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
-    return self.imageScrollView.imageView;
-}
-
-- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
-    YBIBImageData *data = self.yb_cellData;
-    if (data.imageDidScrollBlock) {
-        data.imageDidScrollBlock(data, scrollView);
-    }
-    
-    [self cuttingImage];
-}
-
-- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view {
-    [self hideTailoringImageView];
-}
-
-- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
-    [self hideTailoringImageView];
-}
-
-#pragma mark - <UIGestureRecognizerDelegate>
-
-- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
-    return YES;
-}
-
-#pragma mark - getters
-
-- (YBIBImageScrollView *)imageScrollView {
-    if (!_imageScrollView) {
-        _imageScrollView = [YBIBImageScrollView new];
-        _imageScrollView.delegate = self;
-    }
-    return _imageScrollView;
-}
-
-- (UIImageView *)tailoringImageView {
-    if (!_tailoringImageView) {
-        _tailoringImageView = [UIImageView new];
-        _tailoringImageView.contentMode = UIViewContentModeScaleAspectFit;
-    }
-    return _tailoringImageView;
-}
-
-@end
-//
-//  YBIBImageData+Internal.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/12.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBImageData.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-typedef NS_ENUM(NSInteger, YBIBImageLoadingStatus) {
-    YBIBImageLoadingStatusNone,
-    YBIBImageLoadingStatusCompressing,
-    YBIBImageLoadingStatusDecoding,
-    YBIBImageLoadingStatusQuerying,
-    YBIBImageLoadingStatusProcessing,
-    YBIBImageLoadingStatusDownloading,
-    YBIBImageLoadingStatusReadingPHAsset,
-};
-
-@class YBIBImageData;
-
-@protocol YBIBImageDataDelegate <NSObject>
-@required
-
-- (void)yb_imageData:(YBIBImageData *)data startLoadingWithStatus:(YBIBImageLoadingStatus)status;
-
-- (void)yb_imageIsInvalidForData:(YBIBImageData *)data;
-
-- (void)yb_imageData:(YBIBImageData *)data readyForImage:(__kindof UIImage *)image;
-
-- (void)yb_imageData:(YBIBImageData *)data readyForThumbImage:(__kindof UIImage *)image;
-
-- (void)yb_imageData:(YBIBImageData *)data readyForCompressedImage:(__kindof UIImage *)image;
-
-- (void)yb_imageData:(YBIBImageData *)data downloadProgress:(CGFloat)progress;
-
-- (void)yb_imageDownloadFailedForData:(YBIBImageData *)data;
-
-@end
-
-@interface YBIBImageData ()
-
-@property (nonatomic, weak) id<YBIBImageDataDelegate> delegate;
-
-/// The status of asynchronous tasks.
-@property (nonatomic, assign) YBIBImageLoadingStatus loadingStatus;
-
-/// The origin image.
-@property (nonatomic, strong) UIImage *originImage;
-
-/// The image compressed by 'originImage' if need.
-@property (nonatomic, strong) UIImage *compressedImage;
-
-- (BOOL)shouldCompress;
-
-- (void)cuttingImageToRect:(CGRect)rect complete:(void(^)(UIImage * _Nullable image))complete;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBImageData.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/5.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import <Photos/Photos.h>
-#import "YBIBDataProtocol.h"
-#import "YBIBImageLayout.h"
-#import "YBIBImageCache.h"
-#import "YBIBInteractionProfile.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@class YBIBImageData;
-
-/// 获取 NSData 的闭包
-typedef NSData * _Nullable (^YBIBImageDataBlock)(void);
-
-/// 获取 UIImage 的闭包
-typedef UIImage * _Nullable (^YBIBImageBlock)(void);
-
-/// 修改 NSURLRequest 并返回的闭包
-typedef NSURLRequest * _Nullable (^YBIBRequestModifierBlock)(YBIBImageData *imageData, NSURLRequest *request);
-
-/// 根据图片逻辑像素和 scale 判断是否需要预解码的闭包
-typedef BOOL (^YBIBPreDecodeDecisionBlock)(YBIBImageData *imageData, CGSize imageSize, CGFloat scale);
-
-/// 修改 UIImage 并返回的闭包
-typedef void (^YBIBImageModifierBlock)(YBIBImageData *imageData, UIImage *image, void(^completion)(UIImage *processedImage));
-
-/// 单击事件的处理闭包
-typedef void (^YBIBImageSingleTouchBlock)(YBIBImageData *imageData);
-
-/// 内部图片滚动视图状态回调闭包
-typedef void (^YBIBImageScrollViewStatusBlock)(YBIBImageData *imageData, UIScrollView *scrollView);
-
-
-/**
- 图片数据类，承担配置数据和处理数据的责任
- */
-@interface YBIBImageData : NSObject <YBIBDataProtocol>
-
-/// 本地图片名字
-@property (nonatomic, copy, nullable) NSString *imageName;
-
-/// 本地图片路径
-@property (nonatomic, copy, nullable) NSString *imagePath;
-
-/// 本地图片字节码，返回 NSData
-@property (nonatomic, copy, nullable) YBIBImageDataBlock imageData;
-
-/// 本地图片，返回 UIImage 及其衍生类 (若不是遵循'YYAnimatedImage'协议的类型，将失去对动图和拓展格式的支持)
-@property (nonatomic, copy, nullable) YBIBImageBlock image;
-
-/// 网络图片资源
-@property (nonatomic, copy, nullable) NSURL *imageURL;
-
-/// 修改 NSURLRequest 并返回
-@property (nonatomic, copy, nullable) YBIBRequestModifierBlock requestModifier;
-
-/// 相册图片资源
-@property (nonatomic, strong, nullable) PHAsset *imagePHAsset;
-
-/// 投影视图，当前数据模型对应外界业务的 UIView (通常为 UIImageView)，做转场动效用
-@property (nonatomic, weak, nullable) __kindof UIView *projectiveView;
-
-/// 预览图/缩约图，注意若这个图片过大会导致内存压力（若 projectiveView 存在且是 UIImageView 类型将会自动获取缩约图）
-@property (nonatomic, strong, nullable) UIImage *thumbImage;
-
-/// 预览图/缩约图 URL，缓存中未找到则忽略（若 projectiveView 存在且是 UIImageView 类型将会自动获取缩约图）
-@property (nonatomic, copy, nullable) NSURL *thumbURL;
-
-/// 是否允许保存到相册
-@property (nonatomic, assign) BOOL allowSaveToPhotoAlbum;
-
-/// 根据图片信息判断是否需要预解码
-@property (nonatomic, copy, nullable) YBIBPreDecodeDecisionBlock preDecodeDecision;
-
-/// 是否异步预解码，默认为 YES
-@property (nonatomic, assign) BOOL shouldPreDecodeAsync;
-
-/// 压缩物理像素界限大小，当图片超过这个值将会被压缩显示，默认为 4096*4096
-@property (nonatomic, assign) CGFloat compressingSize;
-
-/// 触发裁剪的缩放比例，必须大于等于 1，默认情况内部会动态计算 (仅当图片需要压缩显示时有效)
-@property (nonatomic, assign) CGFloat cuttingZoomScale;
-
-/**
- 判断图片是否需要压缩显示
- */
-- (BOOL)shouldCompressWithImage:(UIImage *)image;
-
-/**
- 修改原始图片并返回处理后的图片 (特别注意当 image 是大图的时候，避免 OOM)
- Example:
-    [... setImageModifier:^(YBIBImageData *imageData, UIImage * _Nonnull image, void (^ _Nonnull completion)(UIImage * _Nonnull)) {
-        //step 1 : Add watermark, trademark, etc. (Sync or async).
-        ... processing code ...
-        //step 2 : Return the processed UIImage.
-        completion(image);
-    }];
- */
-@property (nonatomic, copy, nullable) YBIBImageModifierBlock originImageModifier;
-
-/// 修改压缩图片并返回处理后的图片 (仅在当前图片需要被压缩时有效)
-@property (nonatomic, copy, nullable) YBIBImageModifierBlock compressedImageModifier;
-
-/// 修改裁剪图片并返回处理后的图片 (仅在当前图片需要被裁剪时有效)
-@property (nonatomic, copy, nullable) YBIBImageModifierBlock cuttedImageModifier;
-
-/// 预留属性可随意使用
-@property (nonatomic, strong, nullable) id extraData;
-
-/// 手势交互动效配置文件
-@property (nonatomic, strong) YBIBInteractionProfile *interactionProfile;
-
-/// 单击的处理，默认是退出图片浏览器
-@property (nonatomic, copy, nullable) YBIBImageSingleTouchBlock singleTouchBlock;
-
-/// 图片滚动的回调
-@property (nonatomic, copy, nullable) YBIBImageScrollViewStatusBlock imageDidScrollBlock;
-
-/// 图片缩放的回调
-@property (nonatomic, copy, nullable) YBIBImageScrollViewStatusBlock imageDidZoomBlock;
-
-/// 图片布局类 (赋值可自定义)
-@property (nonatomic, strong) id<YBIBImageLayout> layout;
-/// 默认图片布局类 (可配置其属性)
-@property (nonatomic, weak, readonly) YBIBImageLayout *defaultLayout;
-
-/**
- 终止处理数据程序
- */
-- (void)stopLoading;
-
-/**
- 清除缓存的数据
- */
-- (void)clearCache;
-
-/**
- 加载数据，一般不需要调用这个方法，当该数据对象做了数据更新时调用
- */
-- (void)loadData;
-
-/// 处理后的原始图片
-@property (nonatomic, strong, readonly) UIImage *originImage;
-
-/// 处理后的压缩图片
-@property (nonatomic, strong, readonly) UIImage *compressedImage;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBImageData.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/5.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBImage.h"
-#import "YBIBImageData.h"
-#import "YBIBImageCell.h"
-#import "YBIBPhotoAlbumManager.h"
-#import "YBIBImageData+Internal.h"
-#import "YBIBUtilities.h"
-#import "YBIBImageCache+Internal.h"
-#import "YBIBSentinel.h"
-#import "YBIBCopywriter.h"
-#import <AssetsLibrary/AssetsLibrary.h>
-
-extern CGImageRef YYCGImageCreateDecodedCopy(CGImageRef imageRef, BOOL decodeForDisplay);
-
-static dispatch_queue_t YBIBImageProcessingQueue(void) {
-    static dispatch_queue_t queue;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        queue = dispatch_queue_create("com.yangbo.imagebrowser.imageprocessing", DISPATCH_QUEUE_CONCURRENT);
-    });
-    return queue;
-}
-
-@implementation YBIBImageData {
-    __weak id _downloadToken;
-    YBIBSentinel *_cuttingSentinel;
-    /// Stop processing tasks when in freeze.
-    BOOL _freezing;
-}
-
-#pragma mark - life cycle
-
-- (void)dealloc {
-    if (_downloadToken && [self.yb_webImageMediator() respondsToSelector:@selector(yb_cancelTaskWithDownloadToken:)]) {
-        [self.yb_webImageMediator() yb_cancelTaskWithDownloadToken:_downloadToken];
-    }
-    [self.imageCache removeForKey:self.cacheKey];
-}
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        [self initValue];
-    }
-    return self;
-}
-
-- (void)initValue {
-    _defaultLayout = _layout = [YBIBImageLayout new];
-    _loadingStatus = YBIBImageLoadingStatusNone;
-    _compressingSize = 4096 * 4096;
-    _shouldPreDecodeAsync = YES;
-    _freezing = NO;
-    _cuttingSentinel = [YBIBSentinel new];
-    _interactionProfile = [YBIBInteractionProfile new];
-    _allowSaveToPhotoAlbum = YES;
-}
-
-#pragma mark - load data
-
-- (void)loadData {
-    _freezing = NO;
-    
-    // Avoid handling asynchronous tasks repeatedly.
-    if (self.loadingStatus != YBIBImageLoadingStatusNone) {
-        [self loadThumbImage];
-        self.loadingStatus = self.loadingStatus;
-        return;
-    }
-    
-    if (self.originImage) {
-        [self loadOriginImage];
-    } else if (self.imageName || self.imagePath || self.imageData) {
-        [self loadYBImage];
-    } else if (self.image) {
-        [self loadImageBlock];
-    } else if (self.imageURL) {
-        [self loadThumbImage];
-        [self loadURL];
-    } else if (self.imagePHAsset) {
-        [self loadThumbImage];
-        [self loadPHAsset];
-    } else {
-        [self.delegate yb_imageIsInvalidForData:self];
-    }
-}
-
-- (void)loadOriginImage {
-    if (_freezing) return;
-    if (!self.originImage) return;
-    
-    if ([self shouldCompress]) {
-        if (self.compressedImage) {
-            [self.delegate yb_imageData:self readyForCompressedImage:self.compressedImage];
-        } else {
-            [self loadThumbImage];
-            [self loadOriginImage_compress];
-        }
-    } else {
-        [self.delegate yb_imageData:self readyForImage:self.originImage];
-    }
-}
-- (void)loadOriginImage_compress {
-    if (_freezing) return;
-    if (!self.originImage) return;
-    
-    self.loadingStatus = YBIBImageLoadingStatusCompressing;
-    __weak typeof(self) wSelf = self;
-    CGSize size = [self bestSizeOfCompressing];
-
-    YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
-        if (self->_freezing) {
-            self.loadingStatus = YBIBImageLoadingStatusNone;
-            return;
-        }
-        // Ensure the best display effect.
-        UIGraphicsBeginImageContextWithOptions(size, NO, UIScreen.mainScreen.scale);
-        [self.originImage drawInRect:CGRectMake(0, 0, size.width, size.height)];
-        if (self->_freezing) {
-            UIGraphicsEndImageContext();
-            self.loadingStatus = YBIBImageLoadingStatusNone;
-            return;
-        }
-        UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
-        UIGraphicsEndImageContext();
-        
-        YBIB_DISPATCH_ASYNC_MAIN(^{
-            __strong typeof(wSelf) self = wSelf;
-            if (!self) return;
-            
-            self.loadingStatus = YBIBImageLoadingStatusNone;
-            
-            [self modifyImageWithModifier:self.compressedImageModifier image:resultImage completion:^(UIImage *processedImage) {
-                __strong typeof(wSelf) self = wSelf;
-                if (!self) return;
-                self.compressedImage = processedImage ?: self.originImage;
-                [self.delegate yb_imageData:self readyForCompressedImage:self.compressedImage];
-            }];
-        })
-    })
-}
-
-- (void)loadYBImage {
-    if (_freezing) return;
-    NSString *name = self.imageName.copy;
-    NSString *path = self.imagePath.copy;
-    NSData *data = self.imageData ? self.imageData().copy : nil;
-    if (name.length == 0 && path.length == 0 && data.length == 0) return;
-    
-    YBImageDecodeDecision decision = [self defaultDecodeDecision];
-    
-    __block YBImage *image;
-    __weak typeof(self) wSelf = self;
-    void(^dealBlock)(void) = ^{
-        if (name.length > 0) {
-            image = [YBImage imageNamed:name decodeDecision:decision];
-        } else if (path.length > 0) {
-            image = [YBImage imageWithContentsOfFile:path decodeDecision:decision];
-        } else if (data.length > 0) {
-            image = [YBImage imageWithData:data scale:UIScreen.mainScreen.scale decodeDecision:decision];
-        }
-        YBIB_DISPATCH_ASYNC_MAIN(^{
-            __strong typeof(wSelf) self = wSelf;
-            if (!self) return;
-            self.loadingStatus = YBIBImageLoadingStatusNone;
-            if (image) {
-                [self setOriginImageAndLoadWithImage:image];
-            } else {
-                [self.delegate yb_imageIsInvalidForData:self];
-            }
-        })
-    };
-    
-    if (self.shouldPreDecodeAsync) {
-        [self loadThumbImage];
-        self.loadingStatus = YBIBImageLoadingStatusDecoding;
-        YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), dealBlock)
-    } else {
-        self.loadingStatus = YBIBImageLoadingStatusDecoding;
-        dealBlock();
-    }
-}
-
-- (void)loadImageBlock {
-    if (_freezing) return;
-    __block UIImage *image = self.image ? self.image() : nil;
-    if (!image) return;
-    
-    BOOL shouldPreDecode = self.preDecodeDecision ? self.preDecodeDecision(self, image.size, image.scale) : ![self shouldCompressWithImage:image];
-    
-    __weak typeof(self) wSelf = self;
-    void(^dealBlock)(void) = ^{
-        // Do not need to decode If 'image' conformed 'YYAnimatedImage'. (Not entirely accurate.)
-        if (![image conformsToProtocol:@protocol(YYAnimatedImage)]) {
-            CGImageRef cgImage = YYCGImageCreateDecodedCopy(image.CGImage, shouldPreDecode);
-            image = [UIImage imageWithCGImage:cgImage scale:image.scale orientation:image.imageOrientation];
-            if (cgImage) CGImageRelease(cgImage);
-        }
-        YBIB_DISPATCH_ASYNC_MAIN(^{
-            __strong typeof(wSelf) self = wSelf;
-            if (!self) return;
-            self.loadingStatus = YBIBImageLoadingStatusNone;
-            [self setOriginImageAndLoadWithImage:image];
-        })
-    };
-    
-    if (self.shouldPreDecodeAsync) {
-        [self loadThumbImage];
-        self.loadingStatus = YBIBImageLoadingStatusDecoding;
-        YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), dealBlock)
-    } else {
-        self.loadingStatus = YBIBImageLoadingStatusDecoding;
-        dealBlock();
-    }
-}
-
-- (void)loadURL {
-    if (!self.imageURL || self.imageURL.absoluteString.length == 0) return;
-    [self loadURL_queryCache];
-}
-- (void)loadURL_queryCache {
-    if (_freezing) return;
-    if (!self.imageURL || self.imageURL.absoluteString.length == 0) return;
-    
-    YBImageDecodeDecision decision = [self defaultDecodeDecision];
-    
-    self.loadingStatus = YBIBImageLoadingStatusQuerying;
-    [self.yb_webImageMediator() yb_queryCacheOperationForKey:self.imageURL completed:^(UIImage * _Nullable image, NSData * _Nullable imageData) {
-        if (!imageData || imageData.length == 0) {
-            YBIB_DISPATCH_ASYNC_MAIN(^{
-                self.loadingStatus = YBIBImageLoadingStatusNone;
-                [self loadURL_download];
-            })
-            return;
-        }
-        
-        YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
-            if (self->_freezing) {
-                self.loadingStatus = YBIBImageLoadingStatusNone;
-                return;
-            }
-            YBImage *image = [YBImage imageWithData:imageData scale:UIScreen.mainScreen.scale decodeDecision:decision];
-            __weak typeof(self) wSelf = self;
-            YBIB_DISPATCH_ASYNC_MAIN(^{
-                __strong typeof(wSelf) self = wSelf;
-                if (!self) return;
-                self.loadingStatus = YBIBImageLoadingStatusNone;
-                if (image) {    // Maybe the image data is invalid.
-                    [self setOriginImageAndLoadWithImage:image];
-                } else {
-                    [self loadURL_download];
-                }
-            })
-        })
-    }];
-}
-- (void)loadURL_download {
-    if (_freezing) return;
-    if (!self.imageURL || self.imageURL.absoluteString.length == 0) return;
-    
-    YBImageDecodeDecision decision = [self defaultDecodeDecision];
-    
-    self.loadingStatus = YBIBImageLoadingStatusDownloading;
-    __weak typeof(self) wSelf = self;
-    _downloadToken = [self.yb_webImageMediator() yb_downloadImageWithURL:self.imageURL requestModifier:^NSURLRequest * _Nullable(NSURLRequest * _Nonnull request) {
-        return self.requestModifier ? self.requestModifier(self, request) : request;
-    } progress:^(NSInteger receivedSize, NSInteger expectedSize) {
-        CGFloat progress = receivedSize * 1.0 / expectedSize ?: 0;
-        YBIB_DISPATCH_ASYNC_MAIN(^{
-            __strong typeof(wSelf) self = wSelf;
-            if (!self) return;
-            [self.delegate yb_imageData:self downloadProgress:progress];
-        })
-    } success:^(NSData * _Nullable imageData, BOOL finished) {
-        if (!finished) return;
-        
-        YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
-            if (self->_freezing) {
-                self.loadingStatus = YBIBImageLoadingStatusNone;
-                return;
-            }
-            YBImage *image = [YBImage imageWithData:imageData scale:UIScreen.mainScreen.scale decodeDecision:decision];
-            YBIB_DISPATCH_ASYNC_MAIN(^{
-                __strong typeof(wSelf) self = wSelf;
-                if (!self) return;
-                [self.yb_webImageMediator() yb_storeToDiskWithImageData:imageData forKey:self.imageURL];
-                self.loadingStatus = YBIBImageLoadingStatusNone;
-                if (image) {
-                    [self setOriginImageAndLoadWithImage:image];
-                } else {
-                    [self.delegate yb_imageIsInvalidForData:self];
-                }
-            })
-        })
-    } failed:^(NSError * _Nullable error, BOOL finished) {
-        if (!finished) return;
-        __strong typeof(wSelf) self = wSelf;
-        if (!self) return;
-        self.loadingStatus = YBIBImageLoadingStatusNone;
-        [self.delegate yb_imageDownloadFailedForData:self];
-    }];
-}
-
-- (void)loadPHAsset {
-    if (_freezing) return;
-    if (!self.imagePHAsset) return;
-    
-    YBImageDecodeDecision decision = [self defaultDecodeDecision];
-    
-    self.loadingStatus = YBIBImageLoadingStatusReadingPHAsset;
-    YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
-        [YBIBPhotoAlbumManager getImageDataWithPHAsset:self.imagePHAsset completion:^(NSData * _Nullable data) {
-            if (self->_freezing) {
-                self.loadingStatus = YBIBImageLoadingStatusNone;
-                return;
-            }
-            YBImage *image = [YBImage imageWithData:data scale:UIScreen.mainScreen.scale decodeDecision:decision];
-            __weak typeof(self) wSelf = self;
-            YBIB_DISPATCH_ASYNC_MAIN(^{
-                __strong typeof(wSelf) self = wSelf;
-                if (!self) return;
-                
-                self.loadingStatus = YBIBImageLoadingStatusNone;
-                if (image) {
-                    [self setOriginImageAndLoadWithImage:image];
-                } else {
-                    [self.delegate yb_imageIsInvalidForData:self];
-                }
-            })
-        }];
-    })
-}
-
-- (void)loadThumbImage {
-    if (_freezing) return;
-    if (self.thumbImage) {
-        [self.delegate yb_imageData:self readyForThumbImage:self.thumbImage];
-    } else if (self.thumbURL) {
-        __weak typeof(self) wSelf = self;
-        [self.yb_webImageMediator() yb_queryCacheOperationForKey:self.thumbURL completed:^(UIImage * _Nullable image, NSData * _Nullable imageData) {
-            __strong typeof(wSelf) self = wSelf;
-            if (!self) return;
-            
-            UIImage *thumbImage;
-            if (image) {
-                thumbImage = image;
-            } else if (imageData) {
-                thumbImage = [UIImage imageWithData:imageData];
-            }
-            // If the target image is ready, ignore the thumb image.
-            BOOL shouldIgnore = [self shouldCompress] ? (self.compressedImage != nil) : (self.originImage != nil);
-            if (!shouldIgnore && thumbImage) {
-                [self.delegate yb_imageData:self readyForThumbImage:thumbImage];
-            }
-        }];
-    } else if (self.projectiveView && [self.projectiveView isKindOfClass:UIImageView.self] && ((UIImageView *)self.projectiveView).image) {
-        UIImage *thumbImage = ((UIImageView *)self.projectiveView).image;
-        [self.delegate yb_imageData:self readyForThumbImage:thumbImage];
-    }
-}
-
-#pragma mark - internal
-
-- (void)cuttingImageToRect:(CGRect)rect complete:(void (^)(UIImage * _Nullable))complete {
-    if (_freezing) return;
-    if (!self.originImage) return;
-    
-    int32_t value = [_cuttingSentinel increase];
-    BOOL (^isCancelled)(void) = ^BOOL(void) {
-        if (self->_freezing) return YES;
-        return value != self->_cuttingSentinel.value;
-    };
-    
-    YBIB_DISPATCH_ASYNC(YBIBImageProcessingQueue(), ^{
-        if (isCancelled()) {
-            complete(nil);
-            return;
-        }
-        CGFloat scale = self.originImage.scale;
-        CGFloat width = self.originImage.size.width;
-        CGFloat height = self.originImage.size.height;
-        
-        BOOL reverseWidthHeight = NO;
-        CGAffineTransform transform = CGAffineTransformIdentity;
-        switch (self.originImage.imageOrientation) {
-            case UIImageOrientationDown:
-            case UIImageOrientationDownMirrored:
-                CGAffineTransformTranslate(CGAffineTransformMakeRotation(-M_PI), -width, -height);
-                break;
-            case UIImageOrientationLeft:
-            case UIImageOrientationLeftMirrored:
-                transform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(M_PI_2), 0, -height);
-                reverseWidthHeight = YES;
-                break;
-            case UIImageOrientationRight:
-            case UIImageOrientationRightMirrored:
-                transform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(-M_PI_2), -width, 0);
-                reverseWidthHeight = YES;
-                break;
-            default: break;
-        }
-        transform = CGAffineTransformScale(transform, scale, scale);
-        CGRect correctRect = CGRectApplyAffineTransform(rect, transform);
-        CGImageRef cgImage = CGImageCreateWithImageInRect(self.originImage.CGImage, correctRect);
-        
-        if (isCancelled()) {
-            complete(nil);
-            if (cgImage) CGImageRelease(cgImage);
-            return;
-        }
-        CGFloat cgWidth = reverseWidthHeight ? CGImageGetHeight(cgImage) : CGImageGetWidth(cgImage);
-        CGFloat cgHeight = reverseWidthHeight ? CGImageGetWidth(cgImage) : CGImageGetHeight(cgImage);
-        CGSize size = [self bestSizeOfCuttingWithOriginSize:CGSizeMake(cgWidth / scale, cgHeight / scale)];
-        UIImage *tmpImage = [UIImage imageWithCGImage:cgImage scale:self.originImage.scale orientation:self.originImage.imageOrientation];
-        if (isCancelled()) {
-            complete(nil);
-            if (cgImage) CGImageRelease(cgImage);
-            return;
-        }
-        
-        // Ensure the best display effect.
-        UIGraphicsBeginImageContextWithOptions(size, NO, UIScreen.mainScreen.scale);
-        [tmpImage drawInRect:CGRectMake(0, 0, size.width, size.height)];
-        if (isCancelled()) {
-            complete(nil);
-            UIGraphicsEndImageContext();
-            if (cgImage) CGImageRelease(cgImage);
-            return;
-        }
-        UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
-        UIGraphicsEndImageContext();
-        if (cgImage) CGImageRelease(cgImage);
-        
-        __weak typeof(self) wSelf = self;
-        YBIB_DISPATCH_ASYNC_MAIN(^{
-            __strong typeof(wSelf) self = wSelf;
-            if (!self) return;
-            
-            [self modifyImageWithModifier:self.cuttedImageModifier image:resultImage completion:^(UIImage *image) {
-                __strong typeof(wSelf) self = wSelf;
-                if (!self) return;
-                complete(image);
-            }];
-        })
-    })
-}
-
-- (BOOL)shouldCompress {
-    return [self shouldCompressWithImage:self.originImage];
-}
-
-#pragma mark - public
-
-- (BOOL)shouldCompressWithImage:(UIImage *)image {
-    if (!image) return NO;
-    return [self shouldCompressWithImageSize:image.size scale:image.scale];
-}
-
-- (void)stopLoading {
-    _freezing = YES;
-    self.loadingStatus = YBIBImageLoadingStatusNone;
-}
-
-- (void)clearCache {
-    [self.imageCache removeForKey:self.cacheKey];
-}
-
-#pragma mark - private
-
-/// 'size': logic pixel.
-- (BOOL)shouldCompressWithImageSize:(CGSize)size scale:(CGFloat)scale {
-    return size.width * scale * size.height * scale > self.compressingSize;
-}
-
-/// Logic pixel.
-- (CGSize)bestSizeOfCompressing {
-    if (!self.originImage) return CGSizeZero;
-    UIDeviceOrientation orientation = self.yb_currentOrientation();
-    CGRect imageViewFrame = [self.layout yb_imageViewFrameWithContainerSize:self.yb_containerSize(orientation) imageSize:self.originImage.size orientation:orientation];
-    return imageViewFrame.size;
-}
-
-/// Logic pixel.
-- (CGSize)bestSizeOfCuttingWithOriginSize:(CGSize)originSize {
-    CGSize containerSize = self.yb_containerSize(self.yb_currentOrientation());
-    CGFloat maxWidth = containerSize.width, maxHeight = containerSize.height;
-    CGFloat oWidth = originSize.width, oHeight = originSize.height;
-    if (maxWidth <= 0 || maxHeight <= 0 || oWidth <= 0 || oHeight <= 0) return CGSizeZero;
-    
-    if (oWidth <= maxWidth && oHeight <= maxHeight) {
-        return originSize;
-    }
-    CGFloat rWidth = 0, rHeight = 0;
-    if (oWidth / maxWidth < oHeight / maxHeight) {
-        rHeight = maxHeight;
-        rWidth = oWidth / oHeight * rHeight;
-    } else {
-        rWidth = maxWidth;
-        rHeight = oHeight / oWidth * rWidth;
-    }
-    return CGSizeMake(rWidth, rHeight);
-}
-
-- (YBImageDecodeDecision)defaultDecodeDecision {
-    __weak typeof(self) wSelf = self;
-    return ^BOOL(CGSize imageSize, CGFloat scale) {
-        __strong typeof(wSelf) self = wSelf;
-        if (!self) return NO;
-        CGSize logicSize = CGSizeMake(imageSize.width / scale, imageSize.height / scale);
-        if (self.preDecodeDecision) return self.preDecodeDecision(self, logicSize, scale);
-        if ([self shouldCompressWithImageSize:logicSize scale:scale]) return NO;
-        return YES;
-    };
-}
-
-- (void)modifyImageWithModifier:(YBIBImageModifierBlock)modifier image:(UIImage *)image completion:(void(^)(UIImage *processedImage))completion {
-    if (modifier) {
-        self.loadingStatus = YBIBImageLoadingStatusProcessing;
-        __weak typeof(self) wSelf = self;
-        modifier(self, image, ^(UIImage *processedImage){
-            // This step is necessary, maybe 'self' is already 'dealloc' if processing code takes too much time.
-            __strong typeof(wSelf) self = wSelf;
-            if (!self) return;
-            self.loadingStatus = YBIBImageLoadingStatusNone;
-            completion(processedImage);
-        });
-    } else {
-        completion(image);
-    }
-}
-
-- (void)setOriginImageAndLoadWithImage:(UIImage *)image {
-    __weak typeof(self) wSelf = self;
-    [self modifyImageWithModifier:self.originImageModifier image:image completion:^(UIImage *processedImage) {
-        __strong typeof(wSelf) self = wSelf;
-        if (!self) return;
-        self.originImage = processedImage;
-        [self loadOriginImage];
-    }];
-}
-
-- (void)saveToPhotoAlbumCompleteWithError:(nullable NSError *)error {
-    if (error) {
-        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].saveToPhotoAlbumFailed];
-    } else {
-        [self.yb_auxiliaryViewHandler() yb_showCorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].saveToPhotoAlbumSuccess];
-    }
-}
-
-- (void)UIImageWriteToSavedPhotosAlbum_completedWithImage:(UIImage *)image error:(NSError *)error context:(void *)context {
-    [self saveToPhotoAlbumCompleteWithError:error];
-}
-
-- (YBIBImageCache *)imageCache {
-    return self.yb_backView.ybib_imageCache;
-}
-
-#pragma mark - <YBIBDataProtocol>
-
-@synthesize yb_isHideTransitioning = _yb_isHideTransitioning;
-@synthesize yb_currentOrientation = _yb_currentOrientation;
-@synthesize yb_containerSize = _yb_containerSize;
-@synthesize yb_containerView = _yb_containerView;
-@synthesize yb_auxiliaryViewHandler = _yb_auxiliaryViewHandler;
-@synthesize yb_webImageMediator = _yb_webImageMediator;
-@synthesize yb_backView = _yb_backView;
-
-- (nonnull Class)yb_classOfCell {
-    return YBIBImageCell.self;
-}
-
-- (UIView *)yb_projectiveView {
-    return self.projectiveView;
-}
-
-- (CGRect)yb_imageViewFrameWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation {
-    return [self.layout yb_imageViewFrameWithContainerSize:containerSize imageSize:imageSize orientation:orientation];
-}
-
-- (void)yb_preload {
-    if (!self.delegate) {
-        [self loadData];
-    }
-}
-
-- (BOOL)yb_allowSaveToPhotoAlbum {
-    return self.allowSaveToPhotoAlbum;
-}
-
-- (void)yb_saveToPhotoAlbum {
-    void(^saveData)(NSData *) = ^(NSData * _Nonnull data){
-        [[ALAssetsLibrary new] writeImageDataToSavedPhotosAlbum:data metadata:nil completionBlock:^(NSURL *assetURL, NSError *error) {
-            [self saveToPhotoAlbumCompleteWithError:error];
-        }];
-    };
-    void(^saveImage)(UIImage *) = ^(UIImage * _Nonnull image){
-        UIImageWriteToSavedPhotosAlbum(image, self, @selector(UIImageWriteToSavedPhotosAlbum_completedWithImage:error:context:), NULL);
-    };
-    void(^unableToSave)(void) = ^(){
-        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].unableToSave];
-    };
-    
-    [YBIBPhotoAlbumManager getPhotoAlbumAuthorizationSuccess:^{
-        if ([self.originImage conformsToProtocol:@protocol(YYAnimatedImage)] && [self.originImage respondsToSelector:@selector(animatedImageData)] && [self.originImage performSelector:@selector(animatedImageData)]) {
-            NSData *data = [self.originImage performSelector:@selector(animatedImageData)];
-            data ? saveData(data) : unableToSave();
-        } else if (self.originImage) {
-            saveImage(self.originImage);
-        } else if (self.imageURL) {
-            [self.yb_webImageMediator() yb_queryCacheOperationForKey:self.imageURL completed:^(UIImage * _Nullable image, NSData * _Nullable data) {
-                if (data) {
-                    saveData(data);
-                } else if (image) {
-                    saveImage(image);
-                } else {
-                    unableToSave();
-                }
-            }];
-        } else {
-            unableToSave();
-        }
-    } failed:^{
-        [self.yb_auxiliaryViewHandler() yb_showIncorrectToastWithContainer:self.yb_containerView text:[YBIBCopywriter sharedCopywriter].getPhotoAlbumAuthorizationFailed];
-    }];
-}
-
-#pragma mark - getters & setters
-
-@synthesize delegate = _delegate;
-- (void)setDelegate:(id<YBIBImageDataDelegate>)delegate {
-    _delegate = delegate;
-    if (delegate) {
-        [self loadData];
-    } else {
-        _freezing = YES;
-        // Remove the resident cache if '_delegate' is nil.
-        [self.imageCache removeResidentForKey:self.cacheKey];
-    }
-}
-- (id<YBIBImageDataDelegate>)delegate {
-    // Stop sending data to the '_delegate' if it is transiting.
-    return self.yb_isHideTransitioning() ? nil : _delegate;
-}
-
-- (void)setImageURL:(NSURL *)imageURL {
-    _imageURL = [imageURL isKindOfClass:NSString.class] ? [NSURL URLWithString:(NSString *)imageURL] : imageURL;
-}
-
-- (NSString *)cacheKey {
-    return [NSString stringWithFormat:@"%p", self];
-}
-
-- (void)setOriginImage:(__kindof UIImage *)originImage {
-    // 'image' should be resident if '_delegate' exists.
-    [self.imageCache setImage:originImage type:YBIBImageCacheTypeOrigin forKey:self.cacheKey resident:self->_delegate != nil];
-}
-- (UIImage *)originImage {
-    return [self.imageCache imageForKey:self.cacheKey type:YBIBImageCacheTypeOrigin];
-}
-
-- (void)setCompressedImage:(UIImage *)compressedImage {
-    // 'image' should be resident if '_delegate' exists.
-    [self.imageCache setImage:compressedImage type:YBIBImageCacheTypeCompressed forKey:self.cacheKey resident:_delegate != nil];
-}
-- (UIImage *)compressedImage {
-    return [self.imageCache imageForKey:self.cacheKey type:YBIBImageCacheTypeCompressed];
-}
-
-- (void)setLoadingStatus:(YBIBImageLoadingStatus)loadingStatus {
-    // Ensure thread safety.
-    YBIB_DISPATCH_ASYNC_MAIN(^{
-        self->_loadingStatus = loadingStatus;
-        [self.delegate yb_imageData:self startLoadingWithStatus:loadingStatus];
-    });
-}
-
-- (CGFloat)cuttingZoomScale {
-    if (_cuttingZoomScale >= 1) return _cuttingZoomScale;
-    _cuttingZoomScale = 1.1;
-    if (!self.originImage) return _cuttingZoomScale;
-    CGFloat imagePixel = self.originImage.size.width * self.originImage.size.height * self.originImage.scale * self.originImage.scale;
-    // The larger the image size, the larger the '_cuttingZoomScale', in order to reduce the burden of CPU and memory.
-    CGFloat scale = YBIBLowMemory() ? 0.28 : 0.19;
-    _cuttingZoomScale += (imagePixel / self.compressingSize * scale);
-    return _cuttingZoomScale;
-}
-
-@end
-//
-//  YBIBImageLayout.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/12.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@protocol YBIBImageLayout <NSObject>
-@required
-
-/**
- 计算图片展示的位置
-
- @param containerSize 容器大小
- @param imageSize 图片大小 (逻辑像素)
- @param orientation 图片浏览器的方向
- @return 图片展示的位置 (frame)
- */
-- (CGRect)yb_imageViewFrameWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation;
-
-/**
- 计算最大缩放比例
-
- @param containerSize 容器大小
- @param imageSize 图片大小 (逻辑像素)
- @param orientation 图片浏览器的方向
- @return 最大缩放比例
- */
-- (CGFloat)yb_maximumZoomScaleWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation;
-
-@end
-
-typedef NS_ENUM(NSUInteger, YBIBImageFillType) {
-    /// 宽度优先填充满
-    YBIBImageFillTypeFullWidth,
-    /// 完整显示
-    YBIBImageFillTypeCompletely
-};
-
-@interface YBIBImageLayout : NSObject <YBIBImageLayout>
-
-/// 纵向的填充方式，默认 YBIBImageFillTypeCompletely
-@property (nonatomic, assign) YBIBImageFillType verticalFillType;
-
-/// 横向的填充方式，默认 YBIBImageFillTypeFullWidth
-@property (nonatomic, assign) YBIBImageFillType horizontalFillType;
-
-/// 最大缩放比例 (必须大于 1 才有效，若不指定内部会自动计算)
-@property (nonatomic, assign) CGFloat maxZoomScale;
-
-/// 自动计算严格缩放比例后，再乘以这个值作为最终缩放比例，默认 1.5
-@property (nonatomic, assign) CGFloat zoomScaleSurplus;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBImageLayout.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/12.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBImageLayout.h"
-
-@implementation YBIBImageLayout
-
-#pragma mark - life cycle
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        _verticalFillType = YBIBImageFillTypeCompletely;
-        _horizontalFillType = YBIBImageFillTypeFullWidth;
-        _zoomScaleSurplus = 1.5;
-    }
-    return self;
-}
-
-#pragma mark - private
-
-- (YBIBImageFillType)fillTypeByOrientation:(UIDeviceOrientation)orientation {
-    return UIDeviceOrientationIsLandscape(orientation) ? self.horizontalFillType : self.verticalFillType;
-}
-
-#pragma mark - <YBIBImageLayout>
-
-- (CGRect)yb_imageViewFrameWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation {
-    if (containerSize.width <= 0 || containerSize.height <= 0 || imageSize.width <= 0 || imageSize.height <= 0) return CGRectZero;
-    
-    CGFloat x = 0, y = 0, width = 0, height = 0;
-    switch ([self fillTypeByOrientation:orientation]) {
-        case YBIBImageFillTypeFullWidth: {
-            x = 0;
-            width = containerSize.width;
-            height = containerSize.width * (imageSize.height / imageSize.width);
-            if (imageSize.width / imageSize.height >= containerSize.width / containerSize.height)
-                y = (containerSize.height - height) / 2.0;
-            else
-                y = 0;
-        }
-            break;
-        case YBIBImageFillTypeCompletely: {
-            if (imageSize.width / imageSize.height >= containerSize.width / containerSize.height) {
-                width = containerSize.width;
-                height = containerSize.width * (imageSize.height / imageSize.width);
-                x = 0;
-                y = (containerSize.height - height) / 2.0;
-            } else {
-                height = containerSize.height;
-                width = containerSize.height * (imageSize.width / imageSize.height);
-                x = (containerSize.width - width) / 2.0;
-                y = 0;
-            }
-        }
-            break;
-        default: return CGRectZero;
-    }
-    return CGRectMake(x, y, width, height);
-}
-
-- (CGFloat)yb_maximumZoomScaleWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation {
-    if (self.maxZoomScale >= 1) return self.maxZoomScale;
-    
-    if (containerSize.width <= 0 || containerSize.height <= 0) return 0;
-    
-    CGFloat scale = [UIScreen mainScreen].scale;
-    if (scale <= 0) return 0;
-    
-    CGFloat widthScale = imageSize.width / scale / containerSize.width,
-    heightScale = imageSize.height / scale / containerSize.height,
-    maxScale = 1;
-    switch ([self fillTypeByOrientation:orientation]) {
-        case YBIBImageFillTypeFullWidth:
-            maxScale = widthScale;
-            break;
-        case YBIBImageFillTypeCompletely:
-            maxScale = MAX(widthScale, heightScale);
-            break;
-        default: return 0;
-    }
-    return MAX(maxScale, 1) * self.zoomScaleSurplus;
-}
-
-@end
-//
-//  YBIBImageScrollView.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/10.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBImage.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-typedef NS_ENUM(NSInteger, YBIBScrollImageType) {
-    YBIBScrollImageTypeNone,
-    YBIBScrollImageTypeOriginal,
-    YBIBScrollImageTypeCompressed,
-    YBIBScrollImageTypeThumb
-};
-
-@interface YBIBImageScrollView : UIScrollView
-
-- (void)setImage:(__kindof UIImage *)image type:(YBIBScrollImageType)type;
-
-@property (nonatomic, strong, readonly) YYAnimatedImageView *imageView;
-
-@property (nonatomic, assign) YBIBScrollImageType imageType;
-
-- (void)reset;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBImageScrollView.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/10.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBImageScrollView.h"
-
-@interface YBIBImageScrollView ()
-@property (nonatomic, strong) YYAnimatedImageView *imageView;
-@end
-
-@implementation YBIBImageScrollView
-
-#pragma mark - life cycle
-
-- (instancetype)initWithFrame:(CGRect)frame {
-    self = [super initWithFrame:frame];
-    if (self) {
-        self.showsHorizontalScrollIndicator = NO;
-        self.showsVerticalScrollIndicator = NO;
-        self.decelerationRate = UIScrollViewDecelerationRateFast;
-        self.maximumZoomScale = 1;
-        self.minimumZoomScale = 1;
-        self.alwaysBounceHorizontal = NO;
-        self.alwaysBounceVertical = NO;
-        self.layer.masksToBounds = NO;
-        if (@available(iOS 11.0, *)) {
-            self.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
-        }
-
-        [self addSubview:self.imageView];
-    }
-    return self;
-}
-
-#pragma mark - public
-
-- (void)setImage:(__kindof UIImage *)image type:(YBIBScrollImageType)type {
-    self.imageView.image = image;
-    self.imageType = type;
-}
-
-- (void)reset {
-    self.zoomScale = 1;
-    self.imageView.image = nil;
-    self.imageView.frame = CGRectZero;
-    self.imageType = YBIBScrollImageTypeNone;
-}
-
-#pragma mark - getters
-
-- (YYAnimatedImageView *)imageView {
-    if (!_imageView) {
-        _imageView = [YYAnimatedImageView new];
-        _imageView.contentMode = UIViewContentModeScaleAspectFill;
-        _imageView.layer.masksToBounds = YES;
-    }
-    return _imageView;
-}
-
-@end
-//
-//  YBIBInteractionProfile.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/30.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@interface YBIBInteractionProfile : NSObject
-
-/// 是否取消手势交互动效
-@property (nonatomic, assign) BOOL disable;
-
-/// 拖动的距离与最大高度的比例，达到这个比例就会出场
-@property (nonatomic, assign) CGFloat dismissScale;
-
-/// 拖动的速度，达到这个值就会出场
-@property (nonatomic, assign) CGFloat dismissVelocityY;
-
-/// 拖动动效复位时的时长
-@property (nonatomic, assign) CGFloat restoreDuration;
-
-/// 拖动触发手势交互动效的起始距离
-@property (nonatomic, assign) CGFloat triggerDistance;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBInteractionProfile.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/30.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import "YBIBInteractionProfile.h"
-
-@implementation YBIBInteractionProfile
-
-- (instancetype)init {
-    self = [super init];
-    if (self) {
-        _disable = NO;
-        _dismissScale = 0.22;
-        _dismissVelocityY = 800;
-        _restoreDuration = 0.15;
-        _triggerDistance = 3;
-    }
-    return self;
-}
-
-@end
-//
-//  YBImage.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/8/31.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#if __has_include(<YYImage/YYImage.h>)
-#import <YYImage/YYFrameImage.h>
-#import <YYImage/YYSpriteSheetImage.h>
-#import <YYImage/YYImageCoder.h>
-#import <YYImage/YYAnimatedImageView.h>
-#elif __has_include(<YYWebImage/YYImage.h>)
-#import <YYWebImage/YYFrameImage.h>
-#import <YYWebImage/YYSpriteSheetImage.h>
-#import <YYWebImage/YYImageCoder.h>
-#import <YYWebImage/YYAnimatedImageView.h>
-#else
-#import "YYFrameImage.h"
-#import "YYSpriteSheetImage.h"
-#import "YYImageCoder.h"
-#import "YYAnimatedImageView.h"
-#endif
-
-NS_ASSUME_NONNULL_BEGIN
-
-/// 🙄波儿菜：Decide whether should to decode by image size. ('imageSize': physical pixel)
-typedef BOOL(^YBImageDecodeDecision)(CGSize imageSize, CGFloat scale);
-
-/**
- It is a fully compatible `UIImage` subclass. It extends the UIImage
- to support animated WebP, APNG and GIF format image data decoding. It also
- support NSCoding protocol to archive and unarchive multi-frame image data.
- 
- If the image is created from multi-frame image data, and you want to play the
- animation, try replace UIImageView with `YYAnimatedImageView`.
- 
- 🙄波儿菜：Copied from 'YYImage' and made some extensions.
- */
-
-@interface YBImage : UIImage <YYAnimatedImage>
-
-+ (nullable __kindof UIImage *)imageNamed:(NSString *)name; // no cache!
-+ (nullable YBImage *)imageWithContentsOfFile:(NSString *)path;
-+ (nullable YBImage *)imageWithData:(NSData *)data;
-+ (nullable YBImage *)imageWithData:(NSData *)data scale:(CGFloat)scale;
-
-/// 🙄波儿菜：Expand methodes.
-/// Start ->
-+ (nullable __kindof UIImage *)imageNamed:(NSString *)name decodeDecision:(nullable YBImageDecodeDecision)decodeDecision;
-+ (nullable YBImage *)imageWithContentsOfFile:(NSString *)path decodeDecision:(nullable YBImageDecodeDecision)decodeDecision;
-+ (nullable YBImage *)imageWithData:(NSData *)data decodeDecision:(nullable YBImageDecodeDecision)decodeDecision;
-+ (nullable YBImage *)imageWithData:(NSData *)data scale:(CGFloat)scale decodeDecision:(nullable YBImageDecodeDecision)decodeDecision;
-/// <- End
-
-/**
- If the image is created from data or file, then the value indicates the data type.
- */
-@property (nonatomic, readonly) YYImageType animatedImageType;
-
-/**
- If the image is created from animated image data (multi-frame GIF/APNG/WebP),
- this property stores the original image data.
- */
-@property (nullable, nonatomic, readonly) NSData *animatedImageData;
-
-/**
- The total memory usage (in bytes) if all frame images was loaded into memory.
- The value is 0 if the image is not created from a multi-frame image data.
- */
-@property (nonatomic, readonly) NSUInteger animatedImageMemorySize;
-
-/**
- Preload all frame image to memory.
- 
- @discussion Set this property to `YES` will block the calling thread to decode
- all animation frame image to memory, set to `NO` will release the preloaded frames.
- If the image is shared by lots of image views (such as emoticon), preload all
- frames will reduce the CPU cost.
- 
- See `animatedImageMemorySize` for memory cost.
- */
-@property (nonatomic) BOOL preloadAllAnimatedImageFrames;
-
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBImage.m
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2018/8/31.
-//  Copyright © 2018年 波儿菜. All rights reserved.
-//
-
-#import "YBImage.h"
-#import "YBIBImageData.h"
-#import "YBIBUtilities.h"
-
-/**
- An array of NSNumber objects, shows the best order for path scale search.
- e.g. iPhone3GS:@[@1,@2,@3] iPhone5:@[@2,@3,@1]  iPhone6 Plus:@[@3,@2,@1]
- */
-static NSArray *_NSBundlePreferredScales() {
-    static NSArray *scales;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        CGFloat screenScale = [UIScreen mainScreen].scale;
-        if (screenScale <= 1) {
-            scales = @[@1,@2,@3];
-        } else if (screenScale <= 2) {
-            scales = @[@2,@3,@1];
-        } else {
-            scales = @[@3,@2,@1];
-        }
-    });
-    return scales;
-}
-
-/**
- Add scale modifier to the file name (without path extension),
- From @"name" to @"name@2x".
- 
- e.g.
- <table>
- <tr><th>Before     </th><th>After(scale:2)</th></tr>
- <tr><td>"icon"     </td><td>"icon@2x"     </td></tr>
- <tr><td>"icon "    </td><td>"icon @2x"    </td></tr>
- <tr><td>"icon.top" </td><td>"icon.top@2x" </td></tr>
- <tr><td>"/p/name"  </td><td>"/p/name@2x"  </td></tr>
- <tr><td>"/path/"   </td><td>"/path/"      </td></tr>
- </table>
- 
- @param scale Resource scale.
- @return String by add scale modifier, or just return if it's not end with file name.
- */
-static NSString *_NSStringByAppendingNameScale(NSString *string, CGFloat scale) {
-    if (!string) return nil;
-    if (fabs(scale - 1) <= __FLT_EPSILON__ || string.length == 0 || [string hasSuffix:@"/"]) return string.copy;
-    return [string stringByAppendingFormat:@"@%@x", @(scale)];
-}
-
-/**
- Return the path scale.
- 
- e.g.
- <table>
- <tr><th>Path            </th><th>Scale </th></tr>
- <tr><td>"icon.png"      </td><td>1     </td></tr>
- <tr><td>"icon@2x.png"   </td><td>2     </td></tr>
- <tr><td>"icon@2.5x.png" </td><td>2.5   </td></tr>
- <tr><td>"icon@2x"       </td><td>1     </td></tr>
- <tr><td>"icon@2x..png"  </td><td>1     </td></tr>
- <tr><td>"icon@2x.png/"  </td><td>1     </td></tr>
- </table>
- */
-static CGFloat _NSStringPathScale(NSString *string) {
-    if (string.length == 0 || [string hasSuffix:@"/"]) return 1;
-    NSString *name = string.stringByDeletingPathExtension;
-    __block CGFloat scale = 1;
-    
-    NSRegularExpression *pattern = [NSRegularExpression regularExpressionWithPattern:@"@[0-9]+\\.?[0-9]*x$" options:NSRegularExpressionAnchorsMatchLines error:nil];
-    [pattern enumerateMatchesInString:name options:kNilOptions range:NSMakeRange(0, name.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
-        if (result.range.location >= 3) {
-            scale = [string substringWithRange:NSMakeRange(result.range.location + 1, result.range.length - 2)].doubleValue;
-        }
-    }];
-    
-    return scale;
-}
-
-
-@implementation YBImage {
-    YYImageDecoder *_decoder;
-    NSArray *_preloadedFrames;
-    dispatch_semaphore_t _preloadedLock;
-    NSUInteger _bytesPerFrame;
-}
-
-+ (__kindof UIImage *)imageNamed:(NSString *)name {
-    return [self imageNamed:name decodeDecision:nil];
-}
-+ (__kindof UIImage *)imageNamed:(NSString *)name decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
-    if (name.length == 0) return nil;
-    if ([name hasSuffix:@"/"]) return nil;
-    
-    NSString *res = name.stringByDeletingPathExtension;
-    NSString *ext = name.pathExtension;
-    NSString *path = nil;
-    CGFloat scale = 1;
-    
-    // If no extension, guess by system supported (same as UIImage).
-    NSArray *exts = ext.length > 0 ? @[ext] : @[@"", @"png", @"jpeg", @"jpg", @"gif", @"webp", @"apng"];
-    NSArray *scales = _NSBundlePreferredScales();
-    for (int s = 0; s < scales.count; s++) {
-        scale = ((NSNumber *)scales[s]).floatValue;
-        NSString *scaledName = _NSStringByAppendingNameScale(res, scale);
-        for (NSString *e in exts) {
-            path = [[NSBundle mainBundle] pathForResource:scaledName ofType:e];
-            if (path) break;
-        }
-        if (path) break;
-    }
-    if (path.length == 0) {
-        // 🙄波儿菜：Assets.xcassets supported.
-        return [super imageNamed:name];
-    }
-    
-    NSData *data = [NSData dataWithContentsOfFile:path];
-    if (data.length == 0) return nil;
-    
-    return [[self alloc] initWithData:data scale:scale decodeDecision:decodeDecision];
-}
-
-+ (YBImage *)imageWithContentsOfFile:(NSString *)path {
-    return [self imageWithContentsOfFile:path decodeDecision:nil];
-}
-+ (YBImage *)imageWithContentsOfFile:(NSString *)path decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
-    return [[self alloc] initWithContentsOfFile:path decodeDecision:decodeDecision];
-}
-
-+ (YBImage *)imageWithData:(NSData *)data {
-    return [self imageWithData:data decodeDecision:nil];
-}
-+ (YBImage *)imageWithData:(NSData *)data decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
-    return [[self alloc] initWithData:data decodeDecision:decodeDecision];
-}
-
-+ (YBImage *)imageWithData:(NSData *)data scale:(CGFloat)scale {
-    return [self imageWithData:data scale:scale decodeDecision:nil];
-}
-+ (YBImage *)imageWithData:(NSData *)data scale:(CGFloat)scale decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
-    return [[self alloc] initWithData:data scale:scale decodeDecision:decodeDecision];
-}
-
-- (instancetype)initWithContentsOfFile:(NSString *)path {
-    return [self initWithContentsOfFile:path decodeDecision:nil];
-}
-- (instancetype)initWithContentsOfFile:(NSString *)path decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
-    NSData *data = [NSData dataWithContentsOfFile:path];
-    return [self initWithData:data scale:_NSStringPathScale(path) decodeDecision:decodeDecision];
-}
-
-- (instancetype)initWithData:(NSData *)data {
-    return [self initWithData:data decodeDecision:nil];
-}
-- (instancetype)initWithData:(NSData *)data decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
-    return [self initWithData:data scale:1 decodeDecision:decodeDecision];
-}
-
-- (instancetype)initWithData:(NSData *)data scale:(CGFloat)scale {
-    return [self initWithData:data scale:scale decodeDecision:nil];
-}
-- (instancetype)initWithData:(NSData *)data scale:(CGFloat)scale decodeDecision:(nullable YBImageDecodeDecision)decodeDecision {
-    if (data.length == 0) return nil;
-    if (scale <= 0) scale = [UIScreen mainScreen].scale;
-    _preloadedLock = dispatch_semaphore_create(1);
-    @autoreleasepool {
-        YYImageDecoder *decoder = [YYImageDecoder decoderWithData:data scale:scale];
-        
-        // 🙄波儿菜：Determine whether should to decode.
-        BOOL decodeForDisplay = YES;
-        if (decodeDecision) {
-            decodeForDisplay = decodeDecision(CGSizeMake(decoder.width, decoder.height), decoder.scale ?: 1);
-        }
-        
-        YYImageFrame *frame = [decoder frameAtIndex:0 decodeForDisplay:decodeForDisplay];
-        UIImage *image = frame.image;
-        if (!image) return nil;
-        self = [self initWithCGImage:image.CGImage scale:decoder.scale orientation:image.imageOrientation];
-        if (!self) return nil;
-        _animatedImageType = decoder.type;
-        if (decoder.frameCount > 1) {
-            _decoder = decoder;
-            _bytesPerFrame = CGImageGetBytesPerRow(image.CGImage) * CGImageGetHeight(image.CGImage);
-            _animatedImageMemorySize = _bytesPerFrame * decoder.frameCount;
-        }
-        self.yy_isDecodedForDisplay = YES;
-    }
-    return self;
-}
-
-- (NSData *)animatedImageData {
-    return _decoder.data;
-}
-
-- (void)setPreloadAllAnimatedImageFrames:(BOOL)preloadAllAnimatedImageFrames {
-    if (_preloadAllAnimatedImageFrames != preloadAllAnimatedImageFrames) {
-        if (preloadAllAnimatedImageFrames && _decoder.frameCount > 0) {
-            NSMutableArray *frames = [NSMutableArray new];
-            for (NSUInteger i = 0, max = _decoder.frameCount; i < max; i++) {
-                UIImage *img = [self animatedImageFrameAtIndex:i];
-                if (img) {
-                    [frames addObject:img];
-                } else {
-                    [frames addObject:[NSNull null]];
-                }
-            }
-            dispatch_semaphore_wait(_preloadedLock, DISPATCH_TIME_FOREVER);
-            _preloadedFrames = frames;
-            dispatch_semaphore_signal(_preloadedLock);
-        } else {
-            dispatch_semaphore_wait(_preloadedLock, DISPATCH_TIME_FOREVER);
-            _preloadedFrames = nil;
-            dispatch_semaphore_signal(_preloadedLock);
-        }
-    }
-}
-
-#pragma mark - protocol NSCoding
-
-- (instancetype)initWithCoder:(NSCoder *)aDecoder {
-    NSNumber *scale = [aDecoder decodeObjectForKey:@"YYImageScale"];
-    NSData *data = [aDecoder decodeObjectForKey:@"YYImageData"];
-    if (data.length) {
-        self = [self initWithData:data scale:scale.doubleValue];
-    } else {
-        self = [super initWithCoder:aDecoder];
-    }
-    return self;
-}
-
-- (void)encodeWithCoder:(NSCoder *)aCoder {
-    if (_decoder.data.length) {
-        [aCoder encodeObject:@(self.scale) forKey:@"YYImageScale"];
-        [aCoder encodeObject:_decoder.data forKey:@"YYImageData"];
-    } else {
-        [super encodeWithCoder:aCoder]; // Apple use UIImagePNGRepresentation() to encode UIImage.
-    }
-}
-
-#pragma mark - protocol YYAnimatedImage
-
-- (NSUInteger)animatedImageFrameCount {
-    return _decoder.frameCount;
-}
-
-- (NSUInteger)animatedImageLoopCount {
-    return _decoder.loopCount;
-}
-
-- (NSUInteger)animatedImageBytesPerFrame {
-    return _bytesPerFrame;
-}
-
-- (UIImage *)animatedImageFrameAtIndex:(NSUInteger)index {
-    if (index >= _decoder.frameCount) return nil;
-    dispatch_semaphore_wait(_preloadedLock, DISPATCH_TIME_FOREVER);
-    UIImage *image = _preloadedFrames[index];
-    dispatch_semaphore_signal(_preloadedLock);
-    if (image) return image == (id)[NSNull null] ? nil : image;
-    return [_decoder frameAtIndex:index decodeForDisplay:YES].image;
-}
-
-- (NSTimeInterval)animatedImageDurationAtIndex:(NSUInteger)index {
-    NSTimeInterval duration = [_decoder frameDurationAtIndex:index];
-    
-    /*
-     http://opensource.apple.com/source/WebCore/WebCore-7600.1.25/platform/graphics/cg/ImageSourceCG.cpp
-     Many annoying ads specify a 0 duration to make an image flash as quickly as
-     possible. We follow Safari and Firefox's behavior and use a duration of 100 ms
-     for any frames that specify a duration of <= 10 ms.
-     See <rdar://problem/7689300> and <http://webkit.org/b/36082> for more information.
-     
-     See also: http://nullsleep.tumblr.com/post/16524517190/animated-gif-minimum-frame-delay-browser.
-     */
-    if (duration < 0.011f) return 0.100f;
-    return duration;
-}
-
-@end
-//
-//  YBIBCellProtocol.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/5.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBGetBaseInfoProtocol.h"
-#import "YBIBOrientationReceiveProtocol.h"
-#import "YBIBOperateBrowserProtocol.h"
-
-@protocol YBIBDataProtocol;
-
-NS_ASSUME_NONNULL_BEGIN
-
-@protocol YBIBCellProtocol <YBIBGetBaseInfoProtocol, YBIBOperateBrowserProtocol, YBIBOrientationReceiveProtocol>
-
-@required
-
-/// Cell 对应的 Data
-@property (nonatomic, strong) id<YBIBDataProtocol> yb_cellData;
-
-@optional
-
-/**
- 获取前景视图，出入场时需要用这个返回值做动效
-
- @return 前景视图
- */
-- (__kindof UIView *)yb_foregroundView;
-
-/**
- 页码变化了
- */
-- (void)yb_pageChanged;
-
-/// 当前 Cell 的页码
-@property (nonatomic, copy) NSInteger(^yb_selfPage)(void);
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBDataProtocol.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/5.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import "YBIBGetBaseInfoProtocol.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@protocol YBIBDataProtocol <YBIBGetBaseInfoProtocol>
-
-@required
-
-/**
- 当前 Data 对应 Cell 的类类型
-
- @return Class 类型
- */
-- (Class)yb_classOfCell;
-
-@optional
-
-/**
- 获取投影视图，当前数据模型对应外界业务的 UIView (通常为 UIImageView)，做转场动效用
- 
- 这个方法会在做出入场动效时调用，若未实现时将无法进行平滑的入场
-
- @return 投影视图
- */
-- (__kindof UIView *)yb_projectiveView;
-
-/**
- 通过一系列数据，计算并返回图片视图在容器中的 frame
- 
- 这个方法会在做入场动效时调用，若未实现时将无法进行平滑的入场
-
- @param containerSize 容器大小
- @param imageSize 图片大小 (逻辑像素)
- @param orientation 图片浏览器的方向
- @return 计算好的 frame
- */
-- (CGRect)yb_imageViewFrameWithContainerSize:(CGSize)containerSize imageSize:(CGSize)imageSize orientation:(UIDeviceOrientation)orientation;
-
-/**
- 预加载数据，有效的预加载能提高性能，请注意管理内存
- */
-- (void)yb_preload;
-
-/**
- 保存到相册
- */
-- (void)yb_saveToPhotoAlbum;
-
-/**
- 是否允许保存到相册
- */
-- (BOOL)yb_allowSaveToPhotoAlbum;
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBGetBaseInfoProtocol.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/6/23.
-//  Copyright © 2019 波儿菜. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-#import "YBIBAuxiliaryViewHandler.h"
-#import "YBIBWebImageMediator.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-@protocol YBIBGetBaseInfoProtocol <NSObject>
-
-@optional
-
-/// 当前的方向
-@property (nonatomic, copy) UIDeviceOrientation(^yb_currentOrientation)(void);
-
-/// 根据方向获取容器大小
-@property (nonatomic, copy) CGSize(^yb_containerSize)(UIDeviceOrientation orientation);
-
-/// 容器视图 (可在上面添加子视图)
-@property (nonatomic, weak) UIView *yb_containerView;
-
-/// 辅助视图处理器
-@property (nonatomic, copy) id<YBIBAuxiliaryViewHandler>(^yb_auxiliaryViewHandler)(void);
-
-/// 图片下载缓存相关中介者
-@property (nonatomic, copy) id<YBIBWebImageMediator>(^yb_webImageMediator)(void);
-
-/// 当前页码
-@property (nonatomic, copy) NSInteger(^yb_currentPage)(void);
-
-/// 总页码数量
-@property (nonatomic, copy) NSInteger(^yb_totalPage)(void);
-
-/// 判断当前展示的 cell 是否恰好在屏幕中间
-@property (nonatomic, copy) BOOL(^yb_cellIsInCenter)(void);
-
-/// 是否正在转场
-@property (nonatomic, copy) BOOL(^yb_isTransitioning)(void);
-/// 是否正在展示过程转场
-@property (nonatomic, copy) BOOL(^yb_isShowTransitioning)(void);
-/// 是否正在隐藏过程转场
-@property (nonatomic, copy) BOOL(^yb_isHideTransitioning)(void);
-
-/// 是否正在旋转
-@property (nonatomic, copy) BOOL(^yb_isRotating)(void);
-
-/// 背景视图 (也就是 YBImageBrower 对象，不可在上面添加子视图。作用：一是可以更改透明度和颜色，入场和出场动效有用；二是可以用来比较内存指针，在做不同实例差异化功能时可能有用，虽然不提倡这么做)
-@property (nonatomic, weak) __kindof UIView *yb_backView;
-
-/// 集合视图
-@property (nonatomic, copy) __kindof UICollectionView *(^yb_collectionView)(void);
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBOperateBrowserProtocol.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/7/8.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import <Foundation/Foundation.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@protocol YBIBOperateBrowserProtocol <NSObject>
-
-@optional
-
-/// 隐藏图片浏览器
-@property (nonatomic, copy) void(^yb_hideBrowser)(void);
-
-/// 是否隐藏状态栏
-@property (nonatomic, copy) void(^yb_hideStatusBar)(BOOL);
-
-/// 是否隐藏工具视图
-@property (nonatomic, copy) void(^yb_hideToolViews)(BOOL);
-
-@end
-
-NS_ASSUME_NONNULL_END
-//
-//  YBIBOrientationReceiveProtocol.h
-//  YBImageBrowserDemo
-//
-//  Created by 波儿菜 on 2019/7/8.
-//  Copyright © 2019 杨波. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-NS_ASSUME_NONNULL_BEGIN
-
-@protocol YBIBOrientationReceiveProtocol <NSObject>
-
-@optional
-
-/**
- 图片浏览器的方向将要变化
-
- @param orientation 期望的方向
- */
-- (void)yb_orientationWillChangeWithExpectOrientation:(UIDeviceOrientation)orientation;
-
-/**
- 图片浏览器的方向变化动效调用，实现的变化会自动转换为动画
-
- @param orientation 期望的方向
- */
-- (void)yb_orientationChangeAnimationWithExpectOrientation:(UIDeviceOrientation)orientation;
-
-/**
- 图片浏览器的方向已经变化
-
- @param orientation 当前的方向
- */
-- (void)yb_orientationDidChangedWithOrientation:(UIDeviceOrientation)orientation;
-
-@end
-
-NS_ASSUME_NONNULL_END