CABasicAnimation chaining not working - swift

Question

I am having difficulties chaining multiple CABasicAnimations. I just want to make a button scale to 1.5 times it's size, then to 0.5 and fade away (while scaling down).
The problem is that only the scaling up works then the button goes back to the original state.
I would have used CGAffineTransformMakeScale but it creates a bug in iOS 7. On iOS 8 & 9 it works fine
I tried using a CAAnimationGroup but same result.
Here's the code:
let scaleUp = CABasicAnimation(keyPath: "transform.scale")
scaleUp.fromValue = 1
scaleUp.toValue = 1.5
scaleUp.duration = 0.2
scaleUp.beginTime = 0
scaleUp.removedOnCompletion = true
self.myButton.layer.addAnimation(scaleUp, forKey: "up")
let scaleDown = CABasicAnimation(keyPath: "transform.scale")
scaleDown.fromValue = 1
scaleDown.toValue = 0.5
scaleDown.duration = 0.2
scaleDown.beginTime = scaleUp.beginTime + scaleDown.duration
scaleDown.removedOnCompletion = true
self.myButton.layer.addAnimation(scaleDown, forKey: "down")
let fade = CABasicAnimation(keyPath: "opacity")
fade.fromValue = 1
fade.toValue = 0
fade.duration = 0.2
fade.beginTime = scaleUp.beginTime + scaleDown.duration
fade.removedOnCompletion = false
self.myButton.layer.addAnimation(fade, forKey: "fade")

Answer 1

that works for me quite well, feel free to play with the duration times, or other animation properties.
I tried to use your instructions for the animation, but it does not mean I have set all properties correctly for your expectations.
Swift (2.x)
func addGrowShrinkAndFadeOutAnimationToView(viewToAnimate: UIView) {
let easeInOutTiming = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
let viewScaleXAnimation = CAKeyframeAnimation(keyPath: "transform.scale.x")
viewScaleXAnimation.duration = 0.4
viewScaleXAnimation.values = [1.0 as Float, 1.5 as Float, 0.5 as Float]
viewScaleXAnimation.keyTimes = [0.0 as Float, 0.5 as Float, 1.0 as Float]
viewScaleXAnimation.timingFunctions = [easeInOutTiming, easeInOutTiming]
viewToAnimate.layer.addAnimation(viewScaleXAnimation, forKey:"Grow, Shrink and Fade out_ScaleX")
let viewScaleYAnimation = CAKeyframeAnimation(keyPath: "transform.scale.y")
viewScaleYAnimation.duration = 0.4
viewScaleYAnimation.values = [1.0 as Float, 1.5 as Float, 0.5 as Float]
viewScaleYAnimation.keyTimes = [0.0 as Float, 0.5 as Float, 1.0 as Float]
viewScaleYAnimation.timingFunctions = [easeInOutTiming, easeInOutTiming]
viewToAnimate.layer.addAnimation(viewScaleYAnimation, forKey:"Grow, Shrink and Fade out_ScaleY")
let viewOpacityAnimation = CAKeyframeAnimation(keyPath: "opacity")
viewOpacityAnimation.duration = 0.4
viewOpacityAnimation.values = [1.0 as Float, 1.0 as Float, 0.0 as Float]
viewOpacityAnimation.keyTimes = [0.0 as Float, 0.5 as Float, 1.0 as Float]
viewOpacityAnimation.timingFunctions = [easeInOutTiming, easeInOutTiming]
viewToAnimate.layer.addAnimation(viewOpacityAnimation, forKey:"Grow, Shrink and Fade out_Opacity")
}

Answer 2

Is there a specific reason you want to use CA animations? I find manipulating constraints easier. I have added a button in storyboard and created outlets for the height and width constraints of the button.
#IBOutlet weak var okButton: UIButton!
#IBOutlet weak var widthConstraint: NSLayoutConstraint!
#IBOutlet weak var heightConstraint: NSLayoutConstraint!
var buttonWidth : CGFloat?
var buttonHeight : CGFloat?
override func viewDidLoad() {
super.viewDidLoad()
self.buttonHeight = self.heightConstraint.constant
self.buttonWidth = self.widthConstraint.constant
}
#IBAction func okButtonTapped(button: UIButton) {
let animationDuration = 2.0
self.heightConstraint.constant = self.buttonWidth! * 2.0
self.widthConstraint.constant = self.buttonHeight! * 2.0
UIView.animateWithDuration(animationDuration, animations: {
button.layoutIfNeeded()
}) { (finished) in
self.heightConstraint.constant = self.buttonWidth! * 0.5
self.widthConstraint.constant = self.buttonHeight! * 0.5
UIView.animateWithDuration(animationDuration, animations: {
button.alpha = 0.0
button.layoutIfNeeded()
}, completion: { (finished) in
button.hidden = true
})
}
}