How can I combine multiple CAKeyframeAnimations into single keyframe animation?

Say I want to combine transform

CAKeyframeAnimation *animation = [CAKeyframeAnimation
   animationWithKeyPath:@"transform"];

and opacity

CAKeyframeAnimation *animation = [CAKeyframeAnimation
   an开发者_开发问答imationWithKeyPath:@"opacity"];

into keyframe animation. How do I combine and specify transform/opacity values for each keyframe?

Create two animations just like you do, use the same keyTimes for both of them, and add them both to the layer with addAnimation:forKey:. It's that easy.