Grouping two Core Animations with CAAnimationGroup causes one CABasicAnimation to not run

Question

I have two animations that I\'m trying to perform on a UILabel on the iPhone with OS 3.1.2. The first rocks the UILabel back and forth:

CAKeyframeAnimation *         


        

Answer 1

You are attempting to simultaneously animate two changes to one property, your CALayer's transform. In the first animation, you are using a helper keypath to change the transform to produce a rotation, and in the second you are changing the transform directly to produce a scaling. The second animation is overwriting the first, because you are constructing whole transforms that are only scaled and animating between them.

It appears that you can cause both scaling and rotation of your layer to occur by using helper keypaths for both animations. If you change your code on the scaling animation to read

CABasicAnimation *animation = nil;
animation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
[animation setToValue:[NSNumber numberWithDouble:3.5]];
[animation setFromValue:[NSNumber numberWithDouble:1.0]];
[animation setAutoreverses:YES];
[animation setDuration:30.0f];
[animation setRepeatCount:10000];
[animation setBeginTime:0.0f];

you should be able to have both rocking and scaling on your layer.