Smooth change ImageView // swift 3

//// Vladimir Zhelnov - neatek.pw - Web/iOS dev

let fadeAnim:CABasicAnimation = CABasicAnimation(keyPath: "contents");
fadeAnim.fromValue = self.imageViewOut.image;
fadeAnim.toValue   = image; // new image
fadeAnim.duration  = 0.8;         //smoothest value
self.imageblur.layer.add(fadeAnim, forKey: "contents");
self.imageblur.image = image; // set new image