iphone - iOS 中背景视图的屏幕截图

Question

我想截取我的 iOS 应用程序的特定层（不是顶层）的屏幕截图。我知道可以使用 CALayer 的“renderInContect”方法来做到这一点。但我找到的所有示例代码都是截取当前屏幕的屏幕截图（顶部图层）。如果您对此主题有任何想法，请分享。谢谢

Answer 1

无论您的视图是在前台还是当前未显示，都应该没有区别。采用：

UIGraphicsBeginImageContextWithOptions(myBackgroundView.bounds.size, YES, 0.0);
[myBackgroundView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

请记住，UIGraphicsBeginImageContextWithOptions它仅适用于 iOS 4.0，否则使用UIGraphicsBeginImageContext.

Answer 2

当您想要捕获视图屏幕截图时隐藏其他视图和控件，之后也可见（取消隐藏）您在捕获图像之前隐藏的所有控件或视图

- (UIImage *)captureView {

  //hide controls if needed .. here hide another all view which you not want to display
    CGRect rect = [yourBackView bounds];

    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [yourBackView.layer renderInContext:context];   
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    //visible controls if needed .. here visible another all view which you want to display
    return img;


}

Answer 3

UIGraphicsBeginImageContext(self.view.bounds.size); // You can put your view here.
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *data = [UIImagePNGRepresentation(image) retain];
UIImage *screenShot = [UIImage imageWithData:data];