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Editorial Team
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Asked: 2026-05-23T11:18:19+00:00

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

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-(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

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1 Answer

  1. Editorial Team

    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.

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