@interface CaptureViewController ()
@property (nonatomic, strong) UIImageView *backgrounView; //控制器背景
@property (nonatomic, strong) UIView *captureView; //整个半透明图层
@property (nonatomic, strong) UIView *alertview; // 图层中间的view
@property (nonatomic, strong) UIImageView *captureImageView; //截屏后展示imageView
@property (nonatomic, strong) UIImage *captureImage; //截屏图片
@end
- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"截屏";
[self initAllViews];
}
- (void)initAllViews { //设置背景图片
self.backgrounView = [[UIImageView alloc]init];
[self.backgrounView setImage:[UIImage imageNamed:@"背景图片.jpg"]];
[self.view addSubview:self.backgrounView];
WeakSelf(weakSelf);
[self.backgrounView mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(weakSelf.view);
}];
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { //在这不创建按钮 使用系统的触摸事件
//开启上下文（开始绘制图片）
UIGraphicsBeginImageContext(self.view.frame.size);
//获取上下文（绘制内容）
CGContextRef context = UIGraphicsGetCurrentContext();
//把控制器的view的内容画到上下文当中
[self.view.layer renderInContext:context];
//从上下文当中生成一张图片
self.captureImage = UIGraphicsGetImageFromCurrentImageContext();
//关闭上下文（绘制结束）
UIGraphicsEndImageContext();
self.captureView = [[UIView alloc]init];
[self.captureView setFrame: [UIScreen mainScreen].bounds];
//应用这种形式设置透明度
self.captureView.backgroundColor = [UIColor colorWithRed:255 / 255.0 green:255 / 255.0 blue:255 / 255.0 alpha:0.5];
/*
//这个种方法设置透明度 会影响子视图的透明度
self.captureView.backgroundColor = [UIColor blackColor];
self.captureView.alpha = 0.5;
*/
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapgesture)];
tap.numberOfTouchesRequired = 1;
tap.numberOfTapsRequired = 1;
[self.captureView addGestureRecognizer:tap];
[[UIApplication sharedApplication].keyWindow addSubview:self.captureView];
[self.captureView addSubview:self.alertview];
self.captureImageView = [[UIImageView alloc]init];
[self.alertview addSubview: self.captureImageView];
[self.captureImageView setImage:self.captureImage];
WeakSelf(weakSelf);
[self.alertview mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(weakSelf.captureView).offset(84);
make.left.equalTo(weakSelf.captureView).offset(20);
make.right.equalTo(weakSelf.captureView).offset(-20);
make.bottom.equalTo(weakSelf.captureView).offset(-64);
}];
[self.captureImageView mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(weakSelf.alertview);
}];
}
- (void)tapgesture { //移除视图
[self.captureView removeFromSuperview];
}