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

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

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)