lazy var countdownView: BRCountDownView = {
  let countdownView = BRCountDownView(timeSeconds: /* 30000 */ 5)
  countdownView.animationStyle = .slideInFromBottom

  /** you can make animate that you would like to perform in this closure if you would.
  To do this, you should change animationStyle property to 'true'.
  */
  //    countdownView.animationStyle = .custom
  //    countdownView.customAnimation = {
  //      [unowned self] animateView, duration in
  //      UIView.animate(withDuration: duration, animations: {
  //        animateView.alpha = 0.0
  //      }, completion:{ finished in
  //        if finished {
  //          animateView.alpha = 1.0
  //        }
  //      })
  //    }

  countdownView.didFinish = {
    [unowned self] (countdownView) -> Void in

    DispatchQueue.main.async {
      self.checkTestLabel.text = "countdown is finished..."
    }

    /** you can again repeat countdown with seconds you want whenever you want. */
    // self.countdownView.repeatCountDown(in: 5)
  }

  countdownView.didRepeat = {
    [unowned self] (countdownView) -> Void in
    
    // it is fired when count-down repeat gets started.
    DispatchQueue.main.async {
      self.checkTestLabel.text = "countdown is repeated..."
    }
  }

  countdownView.didResume = {
    [unowned self] (countdownView) -> Void in
    /**
      do any task here if you need.
    */
    print("didResume!")
  }

  countdownView.didTerminate = {
    [unowned self] (countdownView) -> Void in
    /**
      do any task here if you need.
    */
    print("didTerminate!")
  }

  countdownView.didStop = {
    [unowned self] (countdownView) -> Void in
    /**
      do any task here if you need.
    */
    print("didStop!")
  }

  countdownView.isUserInteractionEnabled = true
  countdownView.didTouchBegin = {
    [unowned self] sender in
    
    print("didTouchBegin!?")
  }

  countdownView.didTouchEnd = {
    [unowned self] sender in
    
    print("didTouchEnd!?")
  }

  return countdownView
}()

override func viewDidLoad() {
  super.viewDidLoad()
  // Do any additional setup after loading the view, typically from a nib.

  self.view.addSubview(countdownView)

  // get center.
  countdownView.center = CGPoint(x: self.view.frame.size.width  / 2,
  y: self.view.frame.size.height / 2)
}