Ios 使用UIImagePickerController拍摄两次照片

在我的应用程序中，我正在使用UIImagePickerController拍照，拍照时，应用程序会显示另一个视图控制器，在该控制器中，我允许用户将农场添加到他的照片中。在这个视图控制器中，我将给用户重新拍摄图片的机会，因此我创建了一个按钮来调用UIImagePickerController，我使用了以下代码：

- (IBAction)buttonRetakePic:(UIBarButtonItem *)sender {
    UIImagePickerController *picker = [[UIImagePickerController alloc]init];
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    picker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
    [self presentViewController:picker animated:YES completion:nil];
}

#pragma mark imagePicker delegate
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSError *error;

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *imagePath = [documentsDirectory stringByAppendingPathComponent:@"/Immagini"];

    if (![[NSFileManager defaultManager] fileExistsAtPath:imagePath]) {
        [[NSFileManager defaultManager] createDirectoryAtPath:imagePath withIntermediateDirectories:NO attributes:nil error:&error];
    }

    NSArray *fileList = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:imagePath error:nil];
    long count = [fileList count];
    NSString *filename = [NSString stringWithFormat:@"Nivea_%ld.jpg", count++];
    NSString *imagePathWithFileName = [imagePath stringByAppendingPathComponent:filename];
    [[NSUserDefaults standardUserDefaults]setObject:filename forKey:@"Filename"];
    [[NSUserDefaults standardUserDefaults] synchronize];

    UIImage *picture = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
    NSData *thumbData = UIImageJPEGRepresentation(picture, 1);
    [thumbData writeToFile:imagePathWithFileName atomically:YES];

    UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *vc = [storyBoard instantiateViewControllerWithIdentifier:@"Picture"];
    [[[[UIApplication sharedApplication] delegate] window] setRootViewController:vc];
}

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但当我按下按钮后，它会显示带有旧图片的UIImagePickerController，我可以在不查看相机的情况下拍照。为什么它不起作用？发生了什么？还有别的方法可以重拍这张照片吗？谢谢

您只是在召回UIImagePicker，它不会打开新的。您将不得不放弃接收到的数据。或者重新加载数据。

首先关闭先前显示的imagePickerController。然后在完成时，尝试演示新的imagePickerController。

没问题，我以前也曾多次尝试过同样的事情：）