IOS屏幕截图

要使用位图上下文

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *data = UIImagePNGRepresentation(image);
NSString *path = @"/Users/jacob/Desktop/capture.png";
[data writeToFile:path atomically:YES];

}