How to delay a CABasicAnimation?

58
votes

I have a CABasicAnimation and want to start it after a delay. In UIKit I can specify delays. The CAMediaTiming protocol has a timeOffset property but I can't see an effect. My next try is to use GCD to delay it but it feels like overkill.

2
iosuikitcore-animationcabasicanimation
I would just use GCD. ` dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ <#code to be executed on the main queue after delay#> });` – BooRanger
@BooRanger what is wrong with the beginTime property? – David Rönnqvist
This answer should answer your question – David Rönnqvist

2 Answers

150
votes

Shouldn't you be using the [CAMediaTiming beginTime] property (reference)?

See Customizing the Timing of an Animation in the Core Animation Programming Guide.

CABasicAnimation *animation;
animation.beginTime = CACurrentMediaTime() + 0.3; //0.3 seconds delay
20
votes

In Swift 3.0:

func animateYourView () {
   let myDelay = 5.0
   let scalePulseAnimation: CABasicAnimation = CABasicAnimation(keyPath: "transform.scale")
   scalePulseAnimation.beginTime = CACurrentMediaTime() + myDelay
   scalePulseAnimation.duration = 0.5
   scalePulseAnimation.repeatCount = 2.0
   scalePulseAnimation.autoreverses = true
   scalePulseAnimation.fromValue = 1.0
   scalePulseAnimation.toValue = 0.5
   myView.layer.add(scalePulseAnimation, forKey: "scale")
}

Where the key line for the delay is:

  scalePulseAnimation.beginTime = CACurrentMediaTime() + myDelay