objective-c - 如何拍摄圆形屏幕截图？

Question

我看过很多关于截图的问题和答案，我知道该怎么做，这不是我的问题，这是我的代码:

- (void)takeScreenShot
{
    //UIGraphicsBeginImageContextWithOptions(CGSizeMake(320, 340), YES, 0.);
    UIGraphicsBeginImageContext(CGSizeMake(320, 480));
    [self.view.window.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
}

如何拍摄圆形屏幕截图而不是仅 320x480 的方框？

Answer 1

你可以试试这个:

- (UIImage *)takeRoundedScreenShot:(CGPoint)center
{
  float cornerRadius = self.view.window.layer.cornerRadius;
  CGAffineTransform savedTransform = self.view.window.transform;

  UIGraphicsBeginImageContext(CGSizeMake(320, 320));
  self.view.window.layer.cornerRadius = 160;
  self.view.window.clipsToBounds = YES;
  self.view.window.transform = CGAffineTransformMakeTranslation(-(center.x-160), -(center.y-160));
  [self.view.window.layer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();

  self.view.window.transform = savedTransform;
  self.view.window.layer.cornerRadius = cornerRadius.

  return viewImage;
}