BBASMScanView.m
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//
// BBASMScanView.m
// SwanAppDemo
//
// Created by Ren,Tao on 2019/1/12.
// Copyright © 2019 baidu. All rights reserved.
//
#import "BBASMScanView.h"
#define LeftDistance 60
@interface BBASMScanView ()
@property (nonatomic, assign) NSInteger heightScale;
@property (nonatomic, assign) BOOL needStop;
@property (nonatomic, strong) UIImageView *lineImageView;
@end
@implementation BBASMScanView
-(id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.backgroundColor = [UIColor clearColor];
self.heightScale = 1;
self.lineImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"scan_blue_line"]];
self.needStop = NO;
[self startAnimating];
}
return self;
}
- (void)layoutSubviews {
[super layoutSubviews];
CGFloat Left = LeftDistance / _heightScale;
CGSize sizeRetangle = CGSizeMake(self.frame.size.width - Left * 2, self.frame.size.width - Left * 2);
CGFloat YMinRetangle = self.frame.size.height / 2.0 - sizeRetangle.height/(2.0 * _heightScale);
_lineImageView.frame = CGRectMake(Left, YMinRetangle + 2, sizeRetangle.width - 4, 5);
[self addSubview:_lineImageView];
}
- (void)startAnimating {
if (_needStop) {
return;
}
CGFloat Left = LeftDistance / _heightScale;
CGSize sizeRetangle = CGSizeMake(self.frame.size.width - Left * 2, (self.frame.size.width - Left * 2) / _heightScale);
CGFloat YMinRetangle = self.frame.size.height / 2.0 - sizeRetangle.height/2.0;
CGFloat YMaxRetangle = YMinRetangle + sizeRetangle.height;
CGRect initFrame = CGRectMake(Left, YMinRetangle + 2, sizeRetangle.width - 4, 5);
_lineImageView.frame = initFrame;
_lineImageView.alpha = 1;
[UIView animateWithDuration:1.5 animations:^{
self.lineImageView.frame = CGRectMake(initFrame.origin.x, YMaxRetangle - 2, initFrame.size.width, initFrame.size.height);
} completion:^(BOOL finished) {
self.lineImageView.alpha = 0;
self.lineImageView.frame = initFrame;
[self performSelector:@selector(startAnimating) withObject:nil afterDelay:0.3];
}];
}
- (void)stopAnimating {
_needStop = YES;
}
- (void)drawRect:(CGRect)rect {
[super drawRect:rect];
[self drawScanRect];
}
- (void)drawScanRect {
//扫码区域Y轴最小坐标
CGFloat Left = LeftDistance / _heightScale;
CGSize sizeRetangle = CGSizeMake(self.frame.size.width - Left * 2, self.frame.size.width - Left * 2);
CGFloat YMinRetangle = self.frame.size.height / 2.0 - sizeRetangle.height/(2.0 * _heightScale);
CGFloat YMaxRetangle = YMinRetangle + sizeRetangle.height / _heightScale;
CGFloat XRetangleRight = self.frame.size.width - Left;
CGContextRef context = UIGraphicsGetCurrentContext();
//非扫码区域半透明
//设置非识别区域颜色
CGContextSetRGBFillColor(context, 0, 0, 0, 0.5);
//扫码区域上面填充
CGRect rect = CGRectMake(0, 0, self.frame.size.width, YMinRetangle);
CGContextFillRect(context, rect);
//扫码区域左边填充
rect = CGRectMake(0, YMinRetangle, Left, sizeRetangle.height/_heightScale);
CGContextFillRect(context, rect);
//扫码区域右边填充
rect = CGRectMake(XRetangleRight, YMinRetangle, Left,sizeRetangle.height/_heightScale);
CGContextFillRect(context, rect);
//扫码区域下面填充
rect = CGRectMake(0, YMaxRetangle, self.frame.size.width, self.frame.size.height - YMaxRetangle);
CGContextFillRect(context, rect);
//执行绘画
CGContextStrokePath(context);
//执行绘画
CGContextStrokePath(context);
//中间画矩形(正方形)
CGContextSetStrokeColorWithColor(context, [UIColor colorWithRed:255 green:255 blue:255 alpha:1.00].CGColor);
CGContextSetLineWidth(context, 1);
CGContextAddRect(context, CGRectMake(Left, YMinRetangle, sizeRetangle.width, sizeRetangle.height/_heightScale));
CGContextStrokePath(context);
//画矩形框4格外围相框角
//相框角的宽度和高度
int wAngle = 15;
int hAngle = 15;
//4个角的 线的宽度
CGFloat linewidthAngle = 4;// 经验参数：6和4
//画扫码矩形以及周边半透明黑色坐标参数
CGFloat diffAngle = linewidthAngle/3;
//diffAngle = linewidthAngle / 2; //框外面4个角，与框有缝隙
//diffAngle = linewidthAngle/2; //框4个角 在线上加4个角效果
//diffAngle = 0;//与矩形框重合
CGContextSetStrokeColorWithColor(context, [UIColor colorWithRed:0.110 green:0.659 blue:0.894 alpha:1.00].CGColor);
CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0);
// Draw them with a 2.0 stroke width so they are a bit more visible.
CGContextSetLineWidth(context, linewidthAngle);
//
CGFloat leftX = Left - diffAngle;
CGFloat topY = YMinRetangle - diffAngle;
CGFloat rightX = XRetangleRight + diffAngle;
CGFloat bottomY = YMaxRetangle + diffAngle;
//左上角水平线
CGContextMoveToPoint(context, leftX-linewidthAngle/2, topY);
CGContextAddLineToPoint(context, leftX + wAngle, topY);
//左上角垂直线
CGContextMoveToPoint(context, leftX, topY-linewidthAngle/2);
CGContextAddLineToPoint(context, leftX, topY+hAngle);
//左下角水平线
CGContextMoveToPoint(context, leftX-linewidthAngle/2, bottomY);
CGContextAddLineToPoint(context, leftX + wAngle, bottomY);
//左下角垂直线
CGContextMoveToPoint(context, leftX, bottomY+linewidthAngle/2);
CGContextAddLineToPoint(context, leftX, bottomY - hAngle);
//右上角水平线
CGContextMoveToPoint(context, rightX+linewidthAngle/2, topY);
CGContextAddLineToPoint(context, rightX - wAngle, topY);
//右上角垂直线
CGContextMoveToPoint(context, rightX, topY-linewidthAngle/2);
CGContextAddLineToPoint(context, rightX, topY + hAngle);
//右下角水平线
CGContextMoveToPoint(context, rightX+linewidthAngle/2, bottomY);
CGContextAddLineToPoint(context, rightX - wAngle, bottomY);
//右下角垂直线
CGContextMoveToPoint(context, rightX, bottomY+linewidthAngle/2);
CGContextAddLineToPoint(context, rightX, bottomY - hAngle);
CGContextStrokePath(context);
}
@end