How to crossfade between 2 images on iPhone using Core Animation

Question

I\'m doing this to learn how to work with Core Animation animatable properties on iPhone (not to learn how to crossfade images, per se).

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Answer 1

Solution in swift

let image1:UIImage = UIImage(named: "someImage1")!;
let image2:UIImage = UIImage(named: "someImage2")!;
let crossFade:CABasicAnimation = CABasicAnimation(keyPath: "contents");
crossFade.duration = 5.0;
crossFade.fromValue = image1.CGImage;
crossFade.toValue = image2.CGImage;
imageView.layer.addAnimation(crossFade, forKey:"animateContents");