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

extension UIImageView
{
    func mySetImage(image:UIImage)
    {
        guard let currentImage = self.image where currentImage != image else { return }
        let animation = CATransition()
        animation.duration = 0.3
        animation.type = kCATransitionFade
        layer.add(animation, forKey: "ImageFade")
        self.image = image
    }
}