class ViewController: UIViewController {

//1.
let interactor = Interactor()

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

//2.
@IBAction func homeButtonPressed(_ sender: UIBarButtonItem) {
performSegue(withIdentifier: "showSlidingMenu", sender: nil)
}

//3. Add a Pan Gesture to slide the menu from Certain Direction
@IBAction func edgePanGesture(sender: UIScreenEdgePanGestureRecognizer) {
let translation = sender.translation(in: view)

let progress = MenuHelper.calculateProgress(translationInView: translation, viewBounds: view.bounds, direction: .Right)

MenuHelper.mapGestureStateToInteractor(
gestureState: sender.state,
progress: progress,
interactor: interactor){
self.performSegue(withIdentifier: "showSlidingMenu", sender: nil)
}
}

//4. Prepare for segue
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destinationViewController = segue.destination as? SlidingViewController {
destinationViewController.transitioningDelegate = self
destinationViewController.interactor = self.interactor
}
}
}

extension ViewController: UIViewControllerTransitioningDelegate {

func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return PresentMenuAnimator()
}

func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
return DismissMenuAnimator()
}

func interactionControllerForDismissal(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
return interactor.hasStarted ? interactor : nil
}

func interactionControllerForPresentation(using animator: UIViewControllerAnimatedTransitioning) -> UIViewControllerInteractiveTransitioning? {
return interactor.hasStarted ? interactor : nil
}
}

class SlidingViewController: UIViewController{

var interactor:Interactor? = nil

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

//Handle Gesture
@IBAction func handleGesture(sender: UIPanGestureRecognizer) {
let translation = sender.translation(in: view)

let progress = MenuHelper.calculateProgress(translationInView: translation, viewBounds: view.bounds, direction: .Left)

MenuHelper.mapGestureStateToInteractor(
gestureState: sender.state,
progress: progress,
interactor: interactor){
self.dismiss(animated: true, completion: nil)
}
}

@IBAction func closeBtnPressed(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
}