MJRefreshBackNormalFooter.m
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//
// MJRefreshBackNormalFooter.m
// MJRefreshExample
//
// Created by MJ Lee on 15/4/24.
// Copyright (c) 2015年 小码哥. All rights reserved.
//
#import "MJRefreshBackNormalFooter.h"
#import "NSBundle+MJRefresh.h"
@interface MJRefreshBackNormalFooter()
{
__unsafe_unretained UIImageView *_arrowView;
}
@property (weak, nonatomic) UIActivityIndicatorView *loadingView;
@end
@implementation MJRefreshBackNormalFooter
#pragma mark - 懒加载子控件
- (UIImageView *)arrowView
{
if (!_arrowView) {
UIImageView *arrowView = [[UIImageView alloc] initWithImage:[NSBundle mj_arrowImage]];
[self addSubview:_arrowView = arrowView];
}
return _arrowView;
}
- (UIActivityIndicatorView *)loadingView
{
if (!_loadingView) {
UIActivityIndicatorView *loadingView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:self.activityIndicatorViewStyle];
loadingView.hidesWhenStopped = YES;
[self addSubview:_loadingView = loadingView];
}
return _loadingView;
}
- (void)setActivityIndicatorViewStyle:(UIActivityIndicatorViewStyle)activityIndicatorViewStyle
{
_activityIndicatorViewStyle = activityIndicatorViewStyle;
self.loadingView = nil;
[self setNeedsLayout];
}
#pragma mark - 重写父类的方法
- (void)prepare
{
[super prepare];
self.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
}
- (void)placeSubviews
{
[super placeSubviews];
// 箭头的中心点
CGFloat arrowCenterX = self.mj_w * 0.5;
if (!self.stateLabel.hidden) {
arrowCenterX -= self.labelLeftInset + self.stateLabel.mj_textWith * 0.5;
}
CGFloat arrowCenterY = self.mj_h * 0.5;
CGPoint arrowCenter = CGPointMake(arrowCenterX, arrowCenterY);
// 箭头
if (self.arrowView.constraints.count == 0) {
self.arrowView.mj_size = self.arrowView.image.size;
self.arrowView.center = arrowCenter;
}
// 圈圈
if (self.loadingView.constraints.count == 0) {
self.loadingView.center = arrowCenter;
}
self.arrowView.tintColor = self.stateLabel.textColor;
}
- (void)setState:(MJRefreshState)state
{
MJRefreshCheckState
// 根据状态做事情
if (state == MJRefreshStateIdle) {
if (oldState == MJRefreshStateRefreshing) {
self.arrowView.transform = CGAffineTransformMakeRotation(0.000001 - M_PI);
[UIView animateWithDuration:MJRefreshSlowAnimationDuration animations:^{
self.loadingView.alpha = 0.0;
} completion:^(BOOL finished) {
// 防止动画结束后，状态已经不是MJRefreshStateIdle
if (state != MJRefreshStateIdle) return;
self.loadingView.alpha = 1.0;
[self.loadingView stopAnimating];
self.arrowView.hidden = NO;
}];
} else {
self.arrowView.hidden = NO;
[self.loadingView stopAnimating];
[UIView animateWithDuration:MJRefreshFastAnimationDuration animations:^{
self.arrowView.transform = CGAffineTransformMakeRotation(0.000001 - M_PI);
}];
}
} else if (state == MJRefreshStatePulling) {
self.arrowView.hidden = NO;
[self.loadingView stopAnimating];
[UIView animateWithDuration:MJRefreshFastAnimationDuration animations:^{
self.arrowView.transform = CGAffineTransformIdentity;
}];
} else if (state == MJRefreshStateRefreshing) {
self.arrowView.hidden = YES;
[self.loadingView startAnimating];
} else if (state == MJRefreshStateNoMoreData) {
self.arrowView.hidden = YES;
[self.loadingView stopAnimating];
}
}
@end