Multiple Methods named '-setTransform:' found

Question

-(void)rotateView:(id)sender {
CGAffineTransform rotateTransform = CGAffineTransformRotate(CGAffineTransformIdentity, M_PI);
[sender setTransform:rotateTransform];//the error is shown here
}

I am getting this caution error that shows up and says Multiple methods named -setTransform: found. It only shows up when I have #import AVFoundation/AVFoundation.h in my header file. Any suggestions? Thanks

Answer 1

Cast sender to the proper class type and the warning should go away:

[(YourClassHere *)sender setTransform:rotateTransform];

As sender is passed to rotateView: as type id Xcode cannot know what actual class type it is and by that which method to call.

Edit: Coincidentally just today Matt Gallagher of Cocoa With Love fame published an article about all kinds of issues caused by calling an ambiguous method on id in Objective-C.