如何在相机内呈现UIImagePicker

Question

所以我在这里尝试做的只是从自定义相机overlayView中打开相机胶卷。我实现了自定义相机overlayView，创建了一个UIImagePickerController，并用我的自定义覆盖替换了默认覆盖。然后我创建了另一个UIImagePickerController实例，将sourceType设置为PhotoLibrary，并在按下overlayView上的按钮时尝试显示它。

按下按钮时显示以下错误消息：

Warning: Attempt to present <UIImagePickerController: 0x14da5440> on <UINavigationController: 0x14e63760> whose view is not in the window hierarchy!

这是我的代码：

- (IBAction)select:(id)sender
{

    if ([UIImagePickerController isSourceTypeAvailable:
         UIImagePickerControllerSourceTypeSavedPhotosAlbum])
    {
        UIImagePickerController *imagePicker =
        [[UIImagePickerController alloc] init];
        imagePicker.delegate = self;
        imagePicker.sourceType =
        UIImagePickerControllerSourceTypePhotoLibrary;
        imagePicker.allowsEditing = NO;
        [self presentViewController:imagePicker
                           animated:YES completion:nil];
    }
}

有谁知道这里的问题是什么？

谢谢！

Answer 1

当另一个视图控制器忽略如下时，您需要将完成块用于当前的一个视图控制器：

[self dismissViewControllerAnimated:YES completion:^{

            [self presentViewController:imagePicker
                                  animated:YES completion:nil];

    }];