iPhone和iPad，播放视频时截图
我的应用程序需要在屏幕上播放视频时截取一些屏幕截图。视频由AVPlayer和AVPlayerLayer播放。当我尝试使用旧方法时出现的问题，例如：
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
CGRect rect = [keyWindow bounds];
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
UIGraphicsBeginImageContextWithOptions(rect.size, NO, [UIScreen mainScreen].scale);
else
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[keyWindow.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
它返回屏幕图像和黑色区域（视频应该在那里）。我可以使用 UIGetScreenImage() 成功截取屏幕截图，但它是一个私有 API，所以我不确定是否可以使用它
My app need to take some screenshot when a video is being played on the screen. The video is played by AVPlayer and AVPlayerLayer. The problem when I try to use old methods, such as:
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
CGRect rect = [keyWindow bounds];
if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
UIGraphicsBeginImageContextWithOptions(rect.size, NO, [UIScreen mainScreen].scale);
else
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[keyWindow.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
It returns an image of the screen and a black area (which the video should be there). I can take a screenshot successfully with UIGetScreenImage() but it is a private API so I am not sure if I can use it or not
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评论（2）
据我所知，许多已发布的应用程序一直在使用
UIGetScreenImage()。看来苹果对它的使用相当宽松。或许你可以抓住机会...From what I have read, many published apps have been using
UIGetScreenImage(). It seems like Apple is quite lenient with its usage. Perhaps you could take a chance...尽管已经过去了很多时间 - 我想指出现在可以在 iOS 7 上使用 UIView 上的快照命令：
https://developer.apple.com/library/ios/documentation/uikit/reference/uiview_class/uiview/uiview.html#//apple_ref/occ/instm/UIView/snapshotViewAfterScreenUpdates：
Although a lot of time has passed - I would like to note this is now possible on iOS 7 using the snapshot command on a UIView:
https://developer.apple.com/library/ios/documentation/uikit/reference/uiview_class/uiview/uiview.html#//apple_ref/occ/instm/UIView/snapshotViewAfterScreenUpdates: