iOS - Facebook pop framework - Repeat forever "shake" animation

Question

I'm using Facebook pop framework to perform some cool animations. I'm shaking a button in this way :

let rotation = POPSpringAnimation.init(propertyNamed: kPOPLayerRotation)
rotation.springBounciness = 30
rotation.springSpeed = 20
rotation.velocity = 30.0
rotation.repeatForever = true

button.layer.pop_addAnimation(rotation, forKey: "rotation")

Despite of the repeatForever set to true the animation doesn't repeat. I noticed that if we have the toValue property set, the animation repeats. Am I doing something wrong?

score 2 · Answer 1 · answered Jun 12 '17 at 13:44

2

I solved this issue adding the following:

rotation.fromValue = 0.0

answered Jun 12 '17 at 13:44

Angels

21
3

score 0 · Accepted Answer · answered Aug 17 '16 at 00:57

You can do it with POPBasicAnimation. If you're rotating forever, you may not need the spring animation.

Looking at your code, you don't have a rotation.toValue You need to tell the animation how far to rotate. Try this:

func configureBtnRotation(btn: UIButton) {
  let rotation = POPBasicAnimation(propertyNamed: kPOPLayerRotation)
  rotation.toValue = 90.0
  rotation.duration = 100.0 //this sets the speed of rotation
  rotation.repeatForever = true
  button.layer.pop_addAnimation(rotation, forKey: "rotation")
}

Hope this helps.

iOS - Facebook pop framework - Repeat forever "shake" animation

2 Answers2