Swift 3 中的滑动手势 [英] Swipe gesture in Swift 3

问题描述

我正在尝试让 UISwipeGestureRecognizer 在 Swift 3 中工作，默认向右滑动可以正常工作，但不能向上或向左滑动.

Im trying to get a UISwipeGestureRecognizer to work in Swift 3, the default swipe right is working correctly though not up down or left.

我已经通过控制拖动一个动作尝试过

I have tried it by control dragging an Action

@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

And, in 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)

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，除了默认的权限之外，其他任何滑动都不起作用.有什么想法吗?

Now, none of the swipes are working except the default right. Any ideas?

推荐答案

步骤 1:在 viewDidLoad() 方法中添加滑动手势.

Step 1: Add swipe Gesture(s) in viewDidLoad() method.

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

Step 2: Check the gesture detection in handleGesture() method

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")
   }
}

我希望这会对某人有所帮助.

I hope this will help someone.

更新:

您需要使用@objc 为最新的 swift 版本调用您的选择器"方法.即，

You need to use @objc to call your 'Selector' method for latest swift versions. ie,

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

这篇关于Swift 3 中的滑动手势的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！