UIImagePickerController:检测相机按钮(快门)按下 [英] UIImagePickerController: Detecting Camera button (shutter) pressed

问题描述

我想在用户按下相机快门后立即调用一个接收 NSNotification 的方法(即当预览"标签栏有重拍"和使用"按钮时).

I would like to call a method that takes an NSNotification immediately after the user presses the camera shutter (i.e when the "Preview" tab bar has the buttons "Retake" and "Use").

我不能使用 didFinishPickingImage 方法，因为此时用户已经按下了使用"按钮.

I can't use the didFinishPickingImage method because at this time the user has already pressed the "Use" button.

我已经通过 UIImagePickerController 的 cameraOverlayView 属性实现了这个(见评论)，但我想知道是否有更快的方法来观察"这个动作.

I have already implemented this by cameraOverlayView property of UIImagePickerController(see comments), but I wonder whether there are quicker ways of 'observing' this action.

有什么想法吗?

推荐答案

要了解相机按钮按下事件，您可以为其触发 NSNotification.

To learn about camera button press event, you can fire a NSNotification for it.

// Add observer for when camera button is pressed
NSNotificationCenter.defaultCenter().addObserver(self, selector: @selector(yourFunctionToPerform), name: "_UIImagePickerControllerUserDidCaptureItem", object: nil)

还将以下方法添加到您正在创建 ImagePickerViewController 的 ViewController 中:

Also add the following method to the ViewController where you are creating ImagePickerViewController:

-(void) yourFunctionToPerform{

    //Do what you want to do on Camera button tap event

}

我也在寻找这个问题，事件的关键/名称真的很模糊.

I was searching for this problem too, the key/name for the event is really obscure.

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