Question

我有一个具有panGesture功能的视图，但我需要以编程方式从一个点向另一个点发送一个pan-gesture。有没有办法在swift中使用具有特定时间间隔的动画？这是我尝试以编程方式调用pan手势：

    var upPanPoint = CGPoint(x: contentView.center.x, y: contentView.center.y + 500)
    var upPan = panGestureRecognizer.setTranslation(upPanPoint, inView: self)

    onSwipe(upPan)

这是识别平移手势的代码：

 func onSwipe(panGestureRecognizer : UIPanGestureRecognizer!) {
    let view = panGestureRecognizer.view!
    print(view)

    switch (panGestureRecognizer.state) {
    case UIGestureRecognizerState.Began:
        if (panGestureRecognizer.locationInView(view).y < view.center.y) {
            self.viewState.rotationDirection = .RotationAwayFromCenter
        } else {
            self.viewState.rotationDirection = .RotationTowardsCenter
        }
    case UIGestureRecognizerState.Ended:
        self.finalizePosition()
    default:
        let translation : CGPoint = panGestureRecognizer.translationInView(view)
        view.center = self.viewState.originalCenter + translation
        self.rotateForTranslation(translation, withRotationDirection: self.viewState.rotationDirection)
        self.executeOnPanForTranslation(translation)
    }
}

提前致谢！

Answer 1

// The Pan Gesture
func createPanGestureRecognizer(targetView: UIImageView) {
    var panGesture = UIPanGestureRecognizer(target: self, action:("handlePanGesture:"))
    targetView.addGestureRecognizer(panGesture)
}

func handlePanGesture(panGesture: UIPanGestureRecognizer) {
    // get translation
    var translation = panGesture.translationInView(view)
    panGesture.setTranslation(CGPointZero, inView: view)
    println(translation)

    // create a new Label and give it the parameters of the old one
    var label = panGesture.view as UIImageView
    label.center = CGPoint(x: label.center.x+translation.x, y: label.center.y+translation.y)
    label.multipleTouchEnabled = true
    label.userInteractionEnabled = true

    if panGesture.state == UIGestureRecognizerState.Began { 
        // add something you want to happen when the Label Panning has started
    }

    if panGesture.state == UIGestureRecognizerState.Ended {
        // add something you want to happen when the Label Panning has ended
    }

    if panGesture.state == UIGestureRecognizerState.Changed {           
        // add something you want to happen when the Label Panning has been change ( during the moving/panning ) 
    } else {  
        // or something when its not moving
    }    
}

Answer 2

let panGesture = UIPanGestureRecognizer(target: self, action: #selector(self.panGesture))
    self.imageView.addGestureRecognizer(panGesture)
func panGesture(sender: UIPanGestureRecognizer){
    let point = sender.location(in: view)
    let panGesture = sender.view
    panGesture?.center = point
    print(point)
}

Answer 3

使用Swift 4.2版，您可以使用以下代码以编程方式设置平移手势：

height

如何以编程方式在swift中发送pangesture

3 个答案: