How to specify an beginTime for an animation by using CFTimeInterval?

Question

For my understanding, beginTime can be used to say \"hey, start at exactly 12:00 \'o clock\". But how would I tell this with an CFTimeInterval type? I thought that this one is n

Answer 1

You first need to convert to the layer's timespace like so:

let currentLayerTime = myLayer.convertTime(CACurrentMediaTime(), from: nil)

Then you can set the beginTime relative to the layer's now time. For instance, to make an animation begin in 2s:

myAnimation.beginTime = currentLayerTime + 2

You'll also likely want to set the fillMode to .backwards, so that you can set the final property value before you add the animation:

myAnimation.fillMode = .backwards
myLayer.someProperty = someFinalValue
myLayer.addAnimation(myAnimation, forKey: "myAnimationName")