在Swift 3中滑动手势

发布时间：2020-12-14 05:49:49 所属栏目：百科来源：网络整理

导读：我试图让UISwipeGestureRecognizer在Swift 3中工作，默认滑动右边工作正常但不向上或向左。我通过控制拖动Action来尝试它 @IBAction func hole(_ recognizer: UISwipeGestureRecognizer) { if (recognizer.direction == UISwipeGestureRecognizerDirection.

我试图让UISwipeGestureRecognizer在Swift 3中工作，默认滑动右边工作正常但不向上或向左。

我通过控制拖动Action来尝试它

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

而且，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，除默认权限外，没有任何滑动工作正在进行。有任何想法吗？

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

我希望这会对某人有所帮助。

（编辑：李大同）

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