iOS实现截图的代码

- (UIImage *) captureScreen {      UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];      CGRect rect = [keyWindow bounds];      UIGraphicsBeginImageContext(rect.size);      CGContextRef context = UIGraphicsGetCurrentContext();      [keyWindow.layer renderInContext:context];         UIImage *img = UIGraphicsGetImageFromCurrentImageContext();      UIGraphicsEndImageContext();      return img;  }

- (void)saveScreenshotToPhotosAlbum:(UIView *)view       {          UIImageWriteToSavedPhotosAlbum([self captureScreen], nil, nil, nil);      }