ios - iPhone: UIImagePickerControllerDelegate methods not Invoked?

Question

I have a camera controller based on a UIImagePickerController:

@interface CameraController : UIImagePickerController
    <UIImagePickerControllerDelegate>
    // <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
{
}

@end

Init generates a warning that UINavigationControllerDelegate is not implemented (it is expected since I don't want my object to be that delegate):

- (id) init
{
    if(!(self = [super init]))
        return nil;

    super.sourceType =  UIImagePickerControllerSourceTypeCamera;
    // Commenting delegat does not help
    super.delegate = self;

    return self;
}

Despite being a UIImagePickerControllerDelegate delegate, imagePickerController:didFinishPickingMediaWithInfo: is not called. I also verified the other two delegate methods are not being called either.

If I do claim adherence to UINavigationControllerDelegate, imagePickerController:didFinishPickingMediaWith is called but I crash on dismissModalViewControllerAnimated:

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

    // Commenting does not help
    [picker autorelease];

    UIImage* image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];   
    ASSERT_VALID(image);

    // Image processing commented out

    // super.delegate = nil;
    // picker.delegate = nil;

    // [self dismissModalViewControllerAnimated:YES];
    // [super dismissModalViewControllerAnimated:YES];
    // [self performSelector:@selector(dismissModalViewControllerAnimated:) withObject:nil afterDelay:0.0f];
    // [self dismissModalViewControllerAnimated:NO];
    // [super dismissModalViewControllerAnimated:NO];
    [self performSelector:@selector(dismissModalViewControllerAnimated:) withObject:nil afterDelay:0.5f];
}

I've looked at a number of posts on this CURSED view controller. The closest, UIImagePickerControllerDelegate not responding properly and iPhone - UIImagePickerControllerDelegate inheritance, did not help.

Any ideas what might be this time? Two questions immediately come to mind: (1) what does being a UINavigationControllerDelegate have to do with invoking my callback with the image, and (2) why can't this object clean itself up properly?

Thanks in advance,

Answer 1

The UIImagePickerController class is not supposed to be subclassed. The reference manual says:

This class is intended to be used as-is and does not support subclassing.

And there's no reason to. Just create a subclass of a UIViewController and implement the delegates.

I've successfully used it many times. I've always declared that my view controller implements UINavigationControllerDelegate but haven't implemented any of the methods of this protocol.