Warning while adding and using a new method in external library protocol

Question

I am using a external library and one of my view controller is registering as delegate for a class in that framework. Now, at one place I want to execute some code on this d

Answer 1

• (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { if ([self.libraryController.delegate respondsToSelector:@selector(actionTaken)]) { [self.libraryController.delegate performSelector:@selector(actionTaken)]; }

Using performSelector instead of directly calling a method will remove warning for sure.

Answer 2

Write a new protocol that extends the old one, and conform to that, something like:

@protocol MyNewProtocol <OtherProtocol>
   - (void) myCoolMethod;
@end

Answer 3

The property libraryController.delegate is defined in the external library to conform to LibraryDelegate. Try to downcast to MyExtendedDelegate before you call the method from your extended protocol.

if ([self.libraryController.delegate conformsToProtocol:@protocol(MyExtendedDelegate)])
{
    id<MyExtendedDelegate> extendedDelegate = (id<MyExtendedDelegate>)self.libraryController.delegate;
    if ([extendedDelegate respondsToSelector:@selector(actionTaken)])
    {
        [extendedDelegate actionTaken];
    }
}