UIPickerView UIImage 和 Segue

在我的应用程序中，我在我的 UserView 中使用带有 UIImagePickerCollection 的相机.但是一旦用户选择使用照片"，我希望将我的照片放在cameraView"的另一个视图中，因为我有一些处理.这是我的代码:

In my app, I use the camera with UIImagePickerCollection in my UserView. But once the user, select "use photo" I would like to have my photo in an other view which is "cameraView" because I have some treatment to do with. Here is my code :

-(void)takeAPicture{
NSLog(@"CHEESE");
UIImagePickerController *imagePicker =
[[UIImagePickerController alloc] init];

imagePicker.delegate = self;

imagePicker.sourceType =
UIImagePickerControllerSourceTypeCamera;

imagePicker.mediaTypes =
@[(NSString *) kUTTypeImage];

imagePicker.allowsEditing = NO;
[self presentViewController:imagePicker
                   animated:YES completion:nil];
}

-(void)imagePickerController:
(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [self dismissViewControllerAnimated:YES completion:^{
    _img = [info objectForKey:UIImagePickerControllerOriginalImage];
    if ([picker sourceType] == UIImagePickerControllerSourceTypeCamera) {
        UIImageWriteToSavedPhotosAlbum(_img, nil, nil, nil);
    }}];
    [self performSegueWithIdentifier:@"toCameraView" sender:self];
}

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([[segue identifier] isEqualToString:@"toCameraView"])
        {
            CameraViewController *transferViewController = segue.destinationViewController;
        transferViewController.img = _img;
    }
}

当我运行我的应用程序时，我收到一条警告消息:

When i'm running my app, I receive an warning message which is :

Warning: Attempt to present <CameraViewController: 0x17e20eb0> on <EIUserViewController: 0x189b1000> while a presentation is in progress!

我不明白它是什么以及如何处理它，我无法在另一个视图中接收我的图像并在选择使用图片"后直接显示我的视图.如果有人有解释或解决方案?谢谢你们！

I don't understand what it is, and how to deal with it, I can't manage to receive my image in the other view and showing my view directly after choosing "use picture". If someone has an explanation or a solution ? thank you guys !