UIImagePickerController takePicture没有响应 [英] UIImagePickerController takePicture not responding

问题描述

我初始化UIImagePickerController:

I init the UIImagePickerController:

    imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;
    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;

，然后使用此方法 [imagePicker takePicture];

而且我没有收到任何对委托方法的调用:

and I not get any call to the delegate method:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

知道为什么吗?

推荐答案

您没有提到是否实际上是通过调用 -presentViewController:animated:completion:(或较旧的 presentViewController:animated:).

You don't mention if you're actually presenting the image picker controller to the user by calling -presentViewController:animated:completion: (or the older presentViewController:animated:).

Apple的文档没有明确说明，但我很确定需要在屏幕上显示图像选择器控制器，以使 -takePicture 正常工作，否则您将能够图片，而用户不知道.

Apple's docs don't explicitly say so, but I'm pretty sure the image picker controller needs to be shown on screen in order for -takePicture to work, otherwise you would be able to take pictures without the user knowing.

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