swift - 在Swift 3中滑动手势

我试图让UISwipeGestureRecognizer在Swift 3中工作，但默认的向右滑动是正确的，尽管不是向上或向下。

我通过控制拖动 Action 来尝试

@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)

按照我的方法

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，除默认权限外，所有滑动均不起作用。有任何想法吗？

最佳答案

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)
}

步骤2:在 handleGesture()方法中检查手势检测

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")
   }
}

希望对您有所帮助。

更新:

您需要使用@objc来调用“选择器”方法以获取最新的Swift版本。
即

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

关于swift - 在Swift 3中滑动手势，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/39764088/