class CoinView: UIViewController, CAAnimationDelegate {

  @IBOutlet weak var coinImageView: UIImageView!
  let coinProvider = CoinSideProvider()

  override func viewDidLoad() {
    super.viewDidLoad()
    let flipCoin = UIPanGestureRecognizer(target: self, action: #selector(flippCoinPan))

     coinImageView .addGestureRecognizer(flipCoin )
  }

  @objc func flippCoinPan(recognizer: UIPanGestureRecognizer) {
     if recognizer.state == .began {
      print("dgdf")
      coinImageView.image = #imageLiteral(resourceName: "coinSide.png")

      rotateCoin()
    }

  }

  func rotateCoin() {
    let rotateAnimation = CABasicAnimation()
    rotateAnimation.keyPath = "transform.rotation"
    rotateAnimation.fromValue = 0
    rotateAnimation.toValue = 4 * Double.pi
    rotateAnimation.duration = 0.4
    rotateAnimation.isRemovedOnCompletion = false
    rotateAnimation.delegate = self

    coinImageView.layer.add(rotateAnimation,
                            forKey: nil)
  }
  func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
    coinImageView.image = coinProvider.randomCoinSide()
  }
}