How can I implement “drag right to dismiss” a View Controller that's in a navigation stack?

Question

By default, if you drag right from the left edge of the screen, it will drag away the ViewController and take it off the stack.

I want to extend this functionality t

Answer 1

Swift 4 version of the accepted answer by @Warif Akhand Rishi

Even though this answer does work there are 2 quirks that I found out about it.

1. if you swipe left it also dismisses just as if you were swiping right.
2. it's also very delicate because if even a slight swipe is directed in either direction it will dismiss the vc.

Other then that it definitely works and you can swipe either right or left to dismiss.

class ViewController: UIGestureRecognizerDelegate, UINavigationControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationController?.interactivePopGestureRecognizer?.delegate = self
        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture(_:)))
        view.addGestureRecognizer(panGesture)
    }

    @objc func handlePanGesture(_ gesture: UIPanGestureRecognizer){

        let interactiveTransition = UIPercentDrivenInteractiveTransition()

        let percent = max(gesture.translation(in: view).x, 0) / view.frame.width

        switch gesture.state {

        case .began:
            navigationController?.delegate = self

            // *** use this if the vc is PUSHED on the stack **
            navigationController?.popViewController(animated: true)

            // *** use this if the vc is PRESENTED **
            //navigationController?.dismiss(animated: true, completion: nil)

        case .changed:
            interactiveTransition.update(percent)

        case .ended:
            let velocity = gesture.velocity(in: view).x

            // Continue if drag more than 50% of screen width or velocity is higher than 1000
            if percent > 0.5 || velocity > 1000 {
                interactiveTransition.finish()
            } else {
                interactiveTransition.cancel()
            }

        case .cancelled, .failed:
            interactiveTransition.cancel()

        default:break
        }
    }
}