tylerlantern

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

func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
    presentationAnimator = BHMenuPresentation(presentedViewController: presented, presenting: presenting)

    interactionTransition.attachViewController(presentedViewController : presented)
    interactionTransition.setUpGestureOnView(view: presentationAnimator?.dimmingView)
    interactionTransition.setUpGestureOnView(view: presented.view)

tylerlantern

fileprivate let threshold : CGFloat = 300
@objc func handlePanGesture(sender: UIPanGestureRecognizer) {
    let view = sender.view!
    let viewTranslation = sender.translation(in: view)
    switch sender.state {
    case .began:
        transitionInProgress = true
        presentedViewController.dismiss(animated: true, completion: nil)
        break
    case .changed:

tylerlantern

class BHMenuInteraction: UIPercentDrivenInteractiveTransition {
    var transitionInProgress = false
    var shouldCompleteTransition = false
    var const :  CGFloat = 0
    var presentedViewController : UIViewController!
    func attachViewController(presentedViewController vc : UIViewController)  {
        presentedViewController = vc
    }
    func setUpGestureOnView(view : UIView?){
        guard let view = view else {return}

tylerlantern

class BHMenuInteraction: UIPercentDrivenInteractiveTransition {
    var transitionInProgress = false
    var shouldCompleteTransition = false
    var const :  CGFloat = 0
    var presentedViewController : UIViewController!
    func attachViewController(presentedViewController vc : UIViewController)  {
        presentedViewController = vc
    }
    func setUpGestureOnView(view : UIView?){
        guard let view = view else {return}

tylerlantern

extension BHMenuTransitionManager : UIViewControllerTransitioningDelegate {  

 func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
     presentationAnimator = BHMenuPresentation(presentedViewController: presented, presenting: presenting)
     return presentationAnimator
 }

}

tylerlantern

  override public func presentationTransitionWillBegin() {
        super.presentationTransitionWillBegin()
        dimmingView.frame = presentingViewController.view.bounds
        containerView?.addSubview(dimmingView)
        guard let coordinator = presentedViewController.transitionCoordinator else {
            return
        }
        coordinator.animate(alongsideTransition: { (context) in
            self.dimmingView.alpha = 0.5
        }, completion: nil)

tylerlantern

public class BHMenuPresentation: UIPresentationController {
    
    var bhDelegate : BHMenuPresentationDelegate?
    public var dimmingView: UIView!
    
    override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
      super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
      setupDimmingView()
    }
    

tylerlantern

class MenuViewController : UIViewController {
  
  @IBAction func action_dismiss(_ sender: Any) {
    self.dismiss(animated: true, completion: nil)
  }
  
  override func viewDidLoad() {
    super.viewDidLoad()
  }
  

tylerlantern

class FirstViewController: UIViewController {
  
  lazy var transitionManager = BHMenuTransitionManager(instance: self, fromViewController: self.navigationController!)
  @IBAction func action_openSideMenu(_ sender: Any) {
    self.performSegue(withIdentifier: "segueMenu", sender: nil)
  }
  
  override func viewDidLoad() {
    super.viewDidLoad()
  }

tylerlantern

extension BHMenuTransitionManager : UIViewControllerTransitioningDelegate {
  
  func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return transitionAnimator
  }
  
  func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return transitionAnimator
  }