UIImagePickerController委托没有调用 [英] UIImagePickerController delegate is not calling

问题描述

我使用以下代码从IPAD前置摄像头自动拍照：

Iam using the following code for taking the picture automatically from IPAD front camera:

UIImagePickerController *imgPkr = [[UIImagePickerController alloc] init];
        imgPkr.sourceType = UIImagePickerControllerSourceTypeCamera;
        imgPkr.delegate = self;

        imgPkr.cameraDevice=UIImagePickerControllerCameraDeviceFront;
        [self presentModalViewController:imgPkr animated:YES];
        imgPkr.showsCameraControls = NO;
        [imgPkr takePicture];

但这段代码不带任何图片，也不会给代表打电话：

But this code Dont take any picture and dont call the delegate:

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

知道代码有什么问题

推荐答案

我的第一个猜测是 [imgPkr takePicture]; 在呈现选择器之前被调用。试试这样：

My first guess is that [imgPkr takePicture]; is being called before the picker is done being presented. Try it like this:

UIImagePickerController *imgPkr = [[UIImagePickerController alloc] init];
        imgPkr.sourceType = UIImagePickerControllerSourceTypeCamera;
        imgPkr.delegate = self;

        imgPkr.cameraDevice=UIImagePickerControllerCameraDeviceFront;
        [self presentModalViewController:imgPkr animated:YES];
        imgPkr.showsCameraControls = NO;
        [self performSelector:@selector(takePicture) withObject:self afterDelay:1.0];

OR

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(takePicture)
                                             name:AVCaptureSessionDidStartRunningNotification 

object:nil];

&

- (void)takePicture
{
    [imgPkr takePicture];
}

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