How to pause and resume UIView.animateWithDuration

Question

I have an image, I animate it with this code, in viewDidAppear:

UIView.animateWithDuration(10.5, delay:0.0, options: [], animations:{
self.myImage.transform          


        

Answer 1

Since iOS 10 provides UIViewPropertyAnimator you can solve your problem easier.

Declare these properties in your controller:

var animationPaused = false
lazy var animator: UIViewPropertyAnimator = UIViewPropertyAnimator(duration: 10.5, curve: .easeInOut, animations: {

    self.myImage.transform = CGAffineTransform(translationX: 0.0, y: 200)
})

Add the following code to the tap handler of myPauseButton:

if self.animator.state == .active { // Don't start or pause the animation when it's finished

    self.animationPaused = !self.animationPaused
    self.animationPaused ? self.animator.pauseAnimation() : self.animator.startAnimation()
}

Start the animation in viewDidAppear(_ animated: Bool) with these lines of code:

self.animationPaused = false
self.animator.startAnimation()