Delegate after subclassing?

Question

I'm sorry, i was not able to formulate a short question for the title..

In case i subclass a class with a delegate protocol and property, does my delegate still need to implement the delegate protocol of the superclass, or do i have to define a new one for the subclass?

In my case I subclassed UIImagePickerController:

[(UIImagePickerController *)self.myUIImagePickerControllerSubclassInstance setDelegate:self];

When I try to set its delegate to self, from some view controller I get the following warning:

warning: Semantic Issue: Sending 'ViewController *' to parameter of incompatible type 'id'

Answer 1

Your delegate needs to comply with UIImagePickerController property declaration:

@property (nonatomic, assign) id<UINavigationControllerDelegate, UIImagePickerControllerDelegate> delegate

So, try adding <UIImagePickerControllerDelegate> to your subclass interface:

@interface YourPicker : UIImagePickerController <UIImagePickerControllerDelegate>
...
@end

And probably you'll need UINavigationControllerDelegate and implement mandatory methods, if any.