捕获 UIImagePickerController 的预览
这个问题已经被问过很多次了。但大多数答案不适用于最新的操作系统（3.0+）或者“苹果将拒绝它”。
我需要的是以编程方式抓取 UIImagePickerController 预览中显示的图像，而无需用户拍照并使用该图像 - 我实际需要的是获取我的应用程序的屏幕截图，其中包含背景中的相机和其他前景上的东西。
我尝试了几种方法，最新的方法是：迭代 UIImagePickerController.view 的所有子视图，并使用 [view.layer renderInContext:] 方法将它们保存为图像。通过这种方法，我实际上可以获得控制器的所有资源（按钮等），但我永远看不到实际的预览。有没有人想办法在 3.0+ 中做到这一点？
This has been asked many times. But most answers are not applicable to the latest OS (3.0+) or they are "Apple will reject it".
What I need is to programmatically grab the image displayed in the preview of the UIImagePickerController without having the user take a photo and use the image - what I actually need is to get a screenshot of my app, which contains the camera in the background and other stuff on the foreground.
I have tried several methods, with the latest being: iterate through all the subviews of the UIImagePickerController.view and save them as images using the [view.layer renderInContext:] method. With this method, I can actually get all the controller's assets (the buttons etc) but I can never see the actual preview. Has anyone figured a way to do this in 3.0+ ?
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问题 1317978 已经回答了这个问题。另外，请查看描述数独解算器中的实时抓取
This has been answered in question 1317978 already. Also, have a look at the blog post describing live grabbing in sudoku solver