Pausing / resuming animation

[iwasrobbed]

Question

From an issue via email:

How do I pause and resume an animation (i.e. one that's in the middle of animating)?

Answer

Read Apple's technical note here: https://developer.apple.com/library/content/qa/qa1673/_index.html

e.g.

func pauseAnimation() {
  var pausedTime = layer.convertTime(CACurrentMediaTime(), fromLayer: nil)
  layer.speed = 0.0
  layer.timeOffset = pausedTime
}

func resumeAnimation() {
  var pausedTime = layer.timeOffset
  layer.speed = 1.0
  layer.timeOffset = 0.0
  layer.beginTime = 0.0
  let timeSincePause = layer.convertTime(CACurrentMediaTime(), fromLayer: nil) - pausedTime
  layer.beginTime = timeSincePause
}