Spin button infinitely: Swift - xcode

Question

I found this code that allows you to rotate/spin 90 degrees when button is pushed in Swift. But what I would like to do is rotate/spin the button infinitely when it is pushed, and stop spinning when the button is pushed again. Here is the code I have:
import UIKit
class ViewController: UIViewController {
#IBOutlet var otherbutton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func Rotate(sender: AnyObject) {
UIView.animateWithDuration(1.0,
animations: ({
self.otherbutton.transform = CGAffineTransformMakeRotation(90)
}))
}
}

Answer 1

You can use a CABasicAnimation to animate it infinitely as follow:
class ViewController: UIViewController {
#IBOutlet weak var spinButton: UIButton!
// create a bool var to know if it is rotating or not
var isRotating = false
#IBAction func spinAction(sender: AnyObject) {
// check if it is not rotating
if !isRotating {
// create a spin animation
let spinAnimation = CABasicAnimation()
// starts from 0
spinAnimation.fromValue = 0
// goes to 360 ( 2 * π )
spinAnimation.toValue = M_PI*2
// define how long it will take to complete a 360
spinAnimation.duration = 1
// make it spin infinitely
spinAnimation.repeatCount = Float.infinity
// do not remove when completed
spinAnimation.removedOnCompletion = false
// specify the fill mode
spinAnimation.fillMode = kCAFillModeForwards
// and the animation acceleration
spinAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
// add the animation to the button layer
spinButton.layer.addAnimation(spinAnimation, forKey: "transform.rotation.z")
} else {
// remove the animation
spinButton.layer.removeAllAnimations()
}
// toggle its state
isRotating = !isRotating
}
}

Answer 2

It should be the same as yours.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var spinButtton: UIButton!
var isRotating = false
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func spinAction(sender: AnyObject) {
if !isRotating {
let spinAnimation = CABasicAnimation()
// start from 0
spinAnimation.fromValue = 0
// goes to 360
spinAnimation.toValue = M_1_PI * 2
// define how long it will take to complete a 360
spinAnimation.duration = 1
// make spin infinitely
spinAnimation.repeatCount = Float.infinity
// do not remove when completed
spinAnimation.removedOnCompletion = false
// specify the fill mode
spinAnimation.fillMode = kCAFillModeForwards
// animation acceleration
spinAnimation.timingFunction = CAMediaTimingFunction (name: kCAMediaTimingFunctionLinear)
// add the animation to the button layer
spinAnimation.layer.addAnimation(spinAnimation, forKey: "transform.rotation.z")
} else {
// remove the animation
spinButtton.layer.removeAllAnimations()
}
// toggle its state
isRotating = !isRotating
}
}