Geste de balayage dans Swift 3

Question

J'essaie de faire fonctionner un UISwipeGestureRecognizer dans Swift 3, le swipe droit par défaut fonctionne correctement mais pas le haut, le bas ou la gauche.

J'ai essayé de le faire en faisant glisser un contrôle sur une action.

@IBAction func hole(_ recognizer: UISwipeGestureRecognizer) {
    if (recognizer.direction == UISwipeGestureRecognizerDirection.left)
    {
        print("left")
    }else if recognizer.direction == .right {
        print("right")
    }else {
        print("other")
    }
}

Et, dans ViewDidLoad

//gesture recognisers
let swipeRight = UISwipeGestureRecognizer(target: self, action: "holeSwiped:")
swipeRight.direction = UISwipeGestureRecognizerDirection.right
self.view.addGestureRecognizer(swipeRight)

let swipeLeft = UISwipeGestureRecognizer(target: self, action: "holeSwiped:")
swipeLeft.direction = UISwipeGestureRecognizerDirection.left
self.view.addGestureRecognizer(swipeLeft)

à ma méthode

func holeSwiped(gesture: UISwipeGestureRecognizer)
{
    if let swipeGesture = gesture as? UISwipeGestureRecognizer{
        switch swipeGesture.direction {
        case UISwipeGestureRecognizerDirection.right:
            print("right swipe")
        case UISwipeGestureRecognizerDirection.left:
            print("left swipe")
        default:
            print("other swipe")
        }
    }
}

Maintenant, aucun des swipes ne fonctionne sauf le droit par défaut. Des idées ?

Answer 1

Étape 1 : Ajouter le(s) geste(s) de balayage dans viewDidLoad() méthode.

override func viewDidLoad() {
    super.viewDidLoad()

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

    let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
    swipeRight.direction = .right
    self.view.addGestureRecognizer(swipeRight)

    let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
    swipeUp.direction = .up
    self.view.addGestureRecognizer(swipeUp)

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

Étape 2 : Vérifiez la détection des gestes dans handleGesture() méthode

func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
   if gesture.direction == .right {
        print("Swipe Right")
   }
   else if gesture.direction == .left {
        print("Swipe Left")
   }
   else if gesture.direction == .up {
        print("Swipe Up")
   }
   else if gesture.direction == .down {
        print("Swipe Down")
   }
}

J'espère que cela aidera quelqu'un.

UPDATE :

Vous devez utiliser @objc pour appeler votre méthode 'Selector' pour les dernières versions de Swift. Par exemple,

@objc func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
  .
  .
  .
}

Answer 2

Swift 4, Xcode 9.2 Ce code vous permettra de reconnaître la direction du glissement de l'utilisateur sur l'ensemble du ViewController (tout l'écran de l'iPhone, pas spécifique à un bouton). Merci @Ram-madhavan

import UIKit

class ViewController: UIViewController {

    //Label to show test and see Gesture direction. 

    @IBOutlet weak var swipeDirectionLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
      //Defining the Various Swipe directions (left, right, up, down)  
        let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
        swipeLeft.direction = .left
        self.view.addGestureRecognizer(swipeLeft)

        let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
        swipeRight.direction = .right
        self.view.addGestureRecognizer(swipeRight)

        let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
        swipeUp.direction = .up
        self.view.addGestureRecognizer(swipeUp)

        let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
        swipeDown.direction = .down
        self.view.addGestureRecognizer(swipeDown) 
    }

    //Function to Print to console Swipe Direction, and Change the label to show the directions. The @objc before func is a must, since we are using #selector (above). You can add to the function, in my case, I'll add a sound, so when someone flips the page, it plays a page sound. 

    @objc func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
        if gesture.direction == UISwipeGestureRecognizerDirection.right {
            print("Swipe Right")
            swipeDirectionLabel.text = "Swiped Right"
        }
        else if gesture.direction == UISwipeGestureRecognizerDirection.left {
            print("Swipe Left")
            swipeDirectionLabel.text = "Swiped Left"

        }
        else if gesture.direction == UISwipeGestureRecognizerDirection.up {
            print("Swipe Up")
            swipeDirectionLabel.text = "Swiped Up"

        }
        else if gesture.direction == UISwipeGestureRecognizerDirection.down {
            print("Swipe Down")
            swipeDirectionLabel.text = "Swiped Down"

        }
    }
}

Answer 3

J'avais le même problème. En fait, tout balayage faisait planter mon code (de Rob Percival, non ?). J'ai donc téléchargé son code fini, l'ai ouvert dans XCode 8 et l'ai laissé convertir en Swift 3. Deux points ont été modifiés.

In ViewDidLoad:
  let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(ViewController.swiped(_:)))

Et à l'intérieur de la fonction :

func swiped(_ gesture: UIGestureRecognizer)

Answer 4

Dans Swift 3, vous pouvez essayer ceci.

let swipeRightOrange = UISwipeGestureRecognizer(target: self, action:#selector(slideToRightWithGestureRecognizer))
swipeRightOrange.direction = UISwipeGestureRecognizerDirection.Right;

let swipeLeftOrange:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(slideToLeftWithGestureRecognizer))
swipeLeftOrange.direction = UISwipeGestureRecognizerDirection.Left;

@IBAction func  slideToLeftWithGestureRecognizer(gestureRecognizer:UISwipeGestureRecognizer)
{
viewOrange.backgroundColor = UIColor.blueColor()
}
@IBAction func slideToRightWithGestureRecognizer
(gestureRecognizer:UISwipeGestureRecognizer)
{
viewOrange.backgroundColor = UIColor.lightGrayColor()
}

Answer 5

    func holeSwiped(gesture: UISwipeGestureRecognizer)
    {
    if let swipeGesture = gesture as? UISwipeGestureRecognizer{
    switch swipeGesture.direction {
    case UISwipeGestureRecognizerDirection.right:
        NSLog("right swipe")
    case UISwipeGestureRecognizerDirection.left:
        NSLog("left swipe")
    default:
        NSLog("other swipe")
    }
   }
  }