How to animate layer shadowOpacity?

Question

I have a view on which I\'ve set the layerOpacity to 1.

    theView.layer.shadowOpacity = 1.0;

This looks fine when the view is farther down th

Answer 1

This will work properly:

#import 

CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"shadowOpacity"];
anim.fromValue = [NSNumber numberWithFloat:1.0];
anim.toValue = [NSNumber numberWithFloat:0.0];
anim.duration = 1.0;
[vv.layer addAnimation:anim forKey:@"shadowOpacity"];
vv.layer.shadowOpacity = 0.0;

For Swift 3.0:

 let animation = CABasicAnimation(keyPath: "shadowOpacity")
 animation.fromValue = layer.shadowOpacity
 animation.toValue = 0.0
 animation.duration = 1.0
 view.layer.add(animation, forKey: animation.keyPath)
 view.layer.shadowOpacity = 0.0