快速改变手势速度

Question

是否可以减慢平移手势，使其以较低的速度移动。

这是我用来移动 3d 对象的代码

    @objc func handlePan(gestureRecognize: UIPanGestureRecognizer) {

    let numberOfTouches = gestureRecognize.numberOfTouches
    let translation = gestureRecognize.translation(in: gestureRecognize.view!)
    var widthRatio = Float(translation.x) / Float(gestureRecognize.view!.frame.size.width) - lastWidthRatio

    if (numberOfTouches == fingersNeededToPan) {
        //  WIDTH constraints
        if(widthRatio >= maxWidthRatioRight) {
            widthRatio = maxWidthRatioRight
        }
        if(widthRatio <= maxWidthRatioLeft) {
            widthRatio = maxWidthRatioLeft
        }

        self.artRoomScene.boxnode.eulerAngles.y = Float(2 * Double.pi) * widthRatio
        //for final check on fingers number
        lastFingersNumber = fingersNeededToPan
    }

    lastFingersNumber = (numberOfTouches>0 ? numberOfTouches : lastFingersNumber)

    if (gestureRecognize.state == .ended && lastFingersNumber==fingersNeededToPan) {
        lastWidthRatio = widthRatio
    }
}

Answer 1

访问平移手势的速度

"sender.velocityInView(self.view) 为您提供每秒像素的速度。为了获得准确的速度，您需要将速度除以 60 将速度更改为每分钟像素，如下所示：

sender.velocityInView(self.view).x / 60 - 水平

sender.velocityInView(self.view).y / 60 - 垂直

因此，您可以通过添加初始值来更新位置，如下所示：

var initialLocation: CGPoint? -> 全球

initialLocation.x = (initialLocation ?? 0)

(initialLocation.x)！ = (initialLocation.x)！ + (sender.velocity(in: colorSlider!).x / 60) - 水平

(initialLocation.y)！ = (initialLocation.y)！ + (sender.velocity(in: colorSlider!).y / 60) - 垂直

谢谢。”