CODEWITHSUNDEEP
ioscalayer
auburg
auburg

Reputation: 1475

calayer rotation

I'm attempting to rotate my calayer object in my callback for a rotation gesture recognizer as such:

CGFloat angle = [(NSNumber *)[hitlayer valueForKeyPath:@"transform.rotation.z"] floatValue];

hitlayer.transform = CATransform3DMakeRotation( (angle+90) / 180.0 * M_PI, 0.0, 0.0, 1.0);

[hitlayer setValue:[NSNumber numberWithFloat:(angle+90)] forKey:@"transform.rotation.z"];

This works fine the first time. But subsequent times, the value returned by transform.rotation.z is still the original value (not the transformed value) so the layer doesn't rotate any further. Any ideas what i'm missing ?

thanks

Upvotes: 1

Views: 702

Answers (1)

Marius Soutier
Marius Soutier

Reputation: 11274

The transform property does not change the view's or layer's bounds or center. It just applies a transformation when it gets drawn, so it simply looks differently. So in your case, you have to keep track of the last degree value and add 90 on each call.

Upvotes: 2

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