Swipe Gesture Recognizer

SwipeGestureRecognizer.swift

class PurpleViewController: UIViewController {
    fileprivate var label = UILabel()

    open override func viewDidLoad() {
        super.viewDidLoad()
        prepareView()
        prepareSwipe()
    }
}

extension PurpleViewController {
    fileprivate func prepareView() {
        isMotionEnabled = true
        view.backgroundColor = Color.pink.base
    }

    // Prepare swipe gestures
    fileprivate func prepareSwipe() {
        let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture))
        swipeRight.direction = UISwipeGestureRecognizerDirection.right
        view.addGestureRecognizer(swipeRight)

        let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture))
        swipeLeft.direction = UISwipeGestureRecognizerDirection.left
        view.addGestureRecognizer(swipeLeft)

        let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture))
        swipeDown.direction = UISwipeGestureRecognizerDirection.down
        view.addGestureRecognizer(swipeDown)

        let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture))
        swipeUp.direction = UISwipeGestureRecognizerDirection.up
        view.addGestureRecognizer(swipeUp)
    }
    
    // Respond to swipe
    @objc
    func respondToSwipeGesture(gesture: UIGestureRecognizer) {
        if let swipeGesture = gesture as? UISwipeGestureRecognizer {
            switch swipeGesture.direction {
            case UISwipeGestureRecognizerDirection.right:
                print("Swiped right")
                dismiss(animated: true) {
                    print("Dismissed after: \(swipeGesture.direction)")
                }
            case UISwipeGestureRecognizerDirection.down:
                print("Swiped down")
                dismiss(animated: true) {
                    print("Dismissed after: \(swipeGesture.direction)")
                }
            case UISwipeGestureRecognizerDirection.left:
                print("Swiped left")
                dismiss(animated: true) {
                    print("Dismissed after: \(swipeGesture.direction)")
                }
            case UISwipeGestureRecognizerDirection.up:
                print("Swiped up")
                dismiss(animated: true) {
                    print("Dismissed after: \(swipeGesture.direction)")
                }
            default:
                break
            }
        }
    }
}