segueing到不同的视图控制器后动画停止

Question

I have an animation in my app that basically just makes a UIButton grow and shrink to make it obvious to the user that they should tap.

The problem is that while it works fine when the view first appears, it doesn't work if I go to a different view controller (with a segue) and then return (nothing happens).

Here is my code:

override func viewWillAppear(animated: Bool) {
    expandAnimation()
}

func expandAnimation() {
    var animation = CABasicAnimation(keyPath: "transform.scale")
    animation.toValue = NSNumber(float: 0.9)
    animation.duration = 1
    animation.repeatCount = 100
    animation.autoreverses = true
    animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
    appDevButton.layer.addAnimation(animation, forKey: nil)
}

I'm sure it's a simple fix, but I couldn't find any info online.

Answer 1

Remove the animation from the button when you leave the view,

    override func viewDidDisappear(animated: Bool) {
        super.viewDidDisappear(animated)
        appDevButton.layer.removeAllAnimations()
    }

Answer 2

Try Solution:

    // Allows the animation to appear on View Controller
    override func viewWillAppear(_ animated: Bool) {
        super.viewDidAppear(true)

        // Function call
        expandAnimation()
    }

    // Allows the animation to disappear from View Controller 
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(true)

        // Function call
        expandAnimation()
    }