swift - Swift 3 中的滑动手势

Question

我试图让 UISwipeGestureRecognizer 在 Swift 3 中工作，默认的向右滑动可以正常工作，但不能上下或向左滑动。

我已经尝试过通过控制拖动 Action 来实现

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

并且，在 ViewDidLoad 中

//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)

我的方法

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")
        }
    }
}

现在，除了默认的右侧滑动之外，所有滑动都不起作用。有什么想法吗？

Answer 1

第 1 步:在 viewDidLoad() 方法中添加滑动手势。

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)
}

第2步:检查handleGesture()方法中的手势检测

func handleGesture(gesture: UISwipeGestureRecognizer) {
   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")
   }
}

我希望这会对某人有所帮助。

更新:

您需要使用 @objc 来调用最新 swift 版本的“选择器”方法。即，

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