Core Animation is not working with "alpha" value
[CABasicAnimation animationWithKeyPath:@"opacity"];UIView exposes this as alpha where as CALayer exposes this as opacity.
For Swift:
let opacity = CABasicAnimation(keyPath: "opacity")opacity.fromValue = fromValueopacity.toValue = toValueopacity.duration = durationopacity.beginTime = CACurrentMediaTime() + beginTime //If a delay is neededview.layer.add(opacity, forKey: nil)If you want to keep the final alpha value, you have to set the current view controller as the delegate of the opacity animation:
opacity.delegate = selfAnd, in the delegate function animationDidStop, you should do:
extension ViewController: CAAnimationDelegate { func animationDidStop(_ anim: CAAnimation, finished flag: Bool) { view.alpha = toValue }}
@ohho answers the posted question. Mine will be a bit more generic. For a list what can and how be animated with CABasicAnimation please refer to Apple's documentation