Drag to dismiss

README.md

Drag to dismiss

Steps:

• Add the view controller that you want to be able to dismiss.
• From the calling view controller, add an action to present it modally.
• On the segue, change Presentation value to Over Current Context.
• See code below.

ViewController.swift

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        let recognizer = UIPanGestureRecognizer(target: self, action: #selector(pan(_:)))
        self.view.addGestureRecognizer(recognizer)
    }

    func pan(_ recognizer: UIPanGestureRecognizer) {
        let translation = recognizer.translation(in: view)
        view.frame.origin.y = translation.y

        if recognizer.state == .ended {
            let velocity = recognizer.velocity(in: view)
            if velocity.y >= 800 || translation.y >= view.frame.height / 3 * 2 {
                dismiss(animated: true, completion: nil)
            } else {
                restoreView()
            }
        } else if recognizer.state == .cancelled {
            restoreView()
        }
    }

    func restoreView() {
        UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseOut, animations: {
            self.view.frame.origin = CGPoint(x: 0, y: 0)
        }, completion: nil)
    }
}