Question

我正在创建swift应用程序，并且我正在使用UISwipegesture我正在向上和向下滑动方向，并且其工作正常，但是当usewr向上或向下滑动时，我将隐藏显示视图，并且按预期方式隐藏并显示，但是当滑动停止时，我想要查看自动显示

让我展示我的代码以更好地理解

代码

videDidLoad()
    let swipe = UISwipeGestureRecognizer(target: self, action: 
    #selector(respondToSwipeGesture(gesture:)))
    swipe.direction = UISwipeGestureRecognizer.Direction.up
    swipe.delegate = self
    self.view.addGestureRecognizer(swipe)

    let swipe1 = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture(gesture:)))
    swipe1.direction = UISwipeGestureRecognizer.Direction.down
    swipe1.delegate = self
    self.view.addGestureRecognizer(swipe1)



  @objc func respondToSwipeGesture(gesture: UIGestureRecognizer) {
        if let swipeGesture = gesture as? UISwipeGestureRecognizer {
            switch swipeGesture.direction {
            case UISwipeGestureRecognizer.Direction.up:
                print("Swiped up")
               viewFilter.isHidden = true
            case UISwipeGestureRecognizer.Direction.down:
                print("Swiped down")
               viewFilter.isHidden = true
            default:
                break
            }
        }
    }

在这里您可以看到上下方向我隐藏了视图，但是在滑动停止时我想再次显示该视图，这样我就不能站立该怎么做可以帮到我

Answer 1

使用UIGestureRecognizer.State appledoc

在选择器中执行以下操作

@objc func respondToSwipeGesture(gesture: UIGestureRecognizer) {
    if let swipeGesture = gesture as? UISwipeGestureRecognizer {
        switch swipeGesture.direction {
        case UISwipeGestureRecognizer.Direction.up:
            print("Swiped up")
           viewFilter.isHidden = true
        case UISwipeGestureRecognizer.Direction.down:
            print("Swiped down")
           viewFilter.isHidden = true
        default:
            break
        }

        // code for looking up which state the gesture currently is in.
        switch swipeGesture.state {
            case .ended, .failed:
                viewFilter.isHidden = false
            // list up other cases here
        }

    }

}

Answer 2

您可以将state用于手势识别器：

    @objc func respondToSwipeGesture(gesture: UIGestureRecognizer) {
    if let swipeGesture = gesture as? UISwipeGestureRecognizer {
        switch swipeGesture.direction {
        case UISwipeGestureRecognizer.Direction.up:
            print("Swiped up")
            viewFilter.isHidden = true
        case UISwipeGestureRecognizer.Direction.down:
            print("Swiped down")
            viewFilter.isHidden = true
        default:
            break
        }
        if swipeGesture.state == .ended {
            viewFilter.isHidden = false
        }
    }
}

Answer 3

您可以在下面进行操作，获得UIGestureRecognizer中的ended state。看到这个doc

 @objc func respondToSwipeGesture(gesture: UIGestureRecognizer) {
    if let swipeGesture = gesture as? UISwipeGestureRecognizer {
        if swipeGesture.state == .ended {
            viewFilter.isHidden = false
        }
    }
}

滑动手势时停止查看问题

3 个答案: