iOS:作为后台任务运行时是否可以截屏? [英] iOS: Is it possible to take screenshots while running as a background task?

问题描述

我想在我的应用处于后台时截取任何正在运行的应用的屏幕截图.

I want to take screenshots of any running app, while my app is in the background.

我知道我可以使用以下方法在 iOS 中截屏:

I know I can take screenshots in iOS using:

UIGraphicsBeginImageContext(webview.frame.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

但这在后台任务中实际上是不可能的，因为 UIGraphicsGetCurrentContext 返回 NULL 并且我想要正在运行的应用程序的屏幕截图而不是我的视图.有没有其他办法?

But this is not really possible in a background task as UIGraphicsGetCurrentContext returns NULL and I want a screenshot of the running app and not my view. Is there any other way?

推荐答案

在运行股票操作系统时，iOS 应用安全沙箱将阻止您的应用访问任何其他应用的视图内容.

When running the stock OS, the iOS app security sandbox will prevent your app from having access to the contents of the view of any other app.

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