小编Ker*_*ean的帖子

我有一个带滑动手势的UIView.

 let swipeUpGesture = UISwipeGestureRecognizer(target: self, action: #selector(NextStepCaptureVC.handleSwipeUp(gesture:)))
        swipeUpGesture.direction = .up
        view.addGestureRecognizer(swipeUpGesture)

func handleSwipeUp(gesture: UISwipeGestureRecognizer) {
        print("Swipe Up")
        heightSlider.setValue(20, animated: true)
    }

当我尝试更改它的值时,但值从0跳到20.我希望值在刷卡时连续变化.我该怎么做？