Core Animation on UIButton Example

buttonAnimationExtension.swift

// Swift 3

extension UIButton {
    
    func pulsate() {
        
        let pulse = CASpringAnimation(keyPath: "transform.scale")
        pulse.duration = 0.6
        pulse.fromValue = 0.95
        pulse.toValue = 1.0
        pulse.autoreverses = true
        pulse.repeatCount = 2
        pulse.initialVelocity = 0.5
        pulse.damping = 1.0
        
        layer.add(pulse, forKey: "pulse")
    }
  
      func flash() {
        
        let flash = CABasicAnimation(keyPath: "opacity")
        flash.duration = 0.5
        flash.fromValue = 1
        flash.toValue = 0.1
        flash.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
        flash.autoreverses = true
        flash.repeatCount = 3
        
        layer.add(flash, forKey: nil)
    }
    
  
    func shake() {
        
        let shake = CABasicAnimation(keyPath: "position")
        shake.duration = 0.1
        shake.repeatCount = 2
        shake.autoreverses = true
        
        let fromPoint = CGPoint(x: center.x - 5, y: center.y)
        let fromValue = NSValue(cgPoint: fromPoint)
        
        let toPoint = CGPoint(x: center.x + 5, y: center.y)
        let toValue = NSValue(cgPoint: toPoint)
        
        shake.fromValue = fromValue
        shake.toValue = toValue
        
        layer.add(shake, forKey: "position")
    }
}


// Example of using the extension on button press

    @IBAction func pulseButtonPressed(_ sender: UIButton) {
        sender.pulsate()
    }
    
    @IBAction func flashButtonPressed(_ sender: UIButton) {
        sender.flash()
    }

    @IBAction func shakeButtonPressed(_ sender: UIButton) {
        sender.shake()
    }

Hi Sean, I would like to write this comment for you as this gist helped me to add some handy animations for my recent Swift control.

You can see that Swift file here and top of the above, I have added your name and link to this Gist for your [unknown] contribution to my control.

Thank you so much!

Kind regards,
Hemang

Hi Sean,
Thank you very much for the tutorial, i loved the way you did but i have one issue. you did this in swift 3 but i am working in swift 4. Now, in the NSValue part, do i need to add NS or not?
thanks.

swift 4 update:

flash.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)