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

Swipe Right to dismiss the View Controller

Swift 5 Version - (Also removed the gesture recognition when swiping from right - to - left)

Important - In ‘Attributes inspector’ of VC2, set the ‘Presentation’ value from ‘Full Screen’ to ‘Over Full Screen’. This will allow VC1 to be visible during dismissing VC2 via gesture — without it, there will be black screen behind VC2 instead of VC1.

class ViewController: UIGestureRecognizerDelegate, UINavigationControllerDelegate {

    var initialTouchPoint: CGPoint = CGPoint(x: 0, y: 0)

    override func viewDidLoad() {
        super.viewDidLoad()

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

    @objc func handlePanGesture(_ sender: UIPanGestureRecognizer) {
        let touchPoint = sender.location(in: self.view?.window)
        let percent = max(sender.translation(in: view).x, 0) / view.frame.width
        let velocity = sender.velocity(in: view).x

        if sender.state == UIGestureRecognizer.State.began {
            initialTouchPoint = touchPoint
        } else if sender.state == UIGestureRecognizer.State.changed {
            if touchPoint.x - initialTouchPoint.x > 0 {
                self.view.frame = CGRect(x: touchPoint.x - initialTouchPoint.x, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height)
            }
        } else if sender.state == UIGestureRecognizer.State.ended || sender.state == UIGestureRecognizer.State.cancelled {

            if percent > 0.5 || velocity > 1000 {
                navigationController?.popViewController(animated: true)
            } else {
                UIView.animate(withDuration: 0.3, animations: {
                    self.view.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height)
                })
            }
        }
    }
}

Hope this helps. Feel free to suggest changes if necessary.