ios在 View 中添加panGesture，更改 View 框架，但不流畅

我给self.view加了一个view，给view加了一个UIPangestureRecognizer， move view，但是不流畅，感觉不流畅， 这是我的代码，谢谢你帮助我

var redView:UIView = UIView();
var redFrame:CGRect = CGRect();
override func viewDidLoad() {
    super.viewDidLoad()
    redView = UIView.init(frame: CGRect.init(x: 0, y: 100, width: KWidth, height: 40))
    redView.backgroundColor = UIColor.red
    self.redFrame = redView.frame;
    self.view.addSubview(redView);
    let pan:UIPanGestureRecognizer = UIPanGestureRecognizer.init(target: self, action: #selector(moveFunction(pan))
    self.redView.addGestureRecognizer(pan)
}
func moveFunction(pan:UIPanGestureRecognizer) {
    let point:CGPoint = pan.translation(in: self.view)
    pan.setTranslation(CGPoint.zero, in: self.view)
    if  pan.state == .changed{
        print(point)
        let redY:CGFloat = redView.frame.origin.y + point.y
        redView.frame = CGRect.init(x: 0, y: Int(redY), width: KWidth, height: 40)
    }
}

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Best Answer-推荐答案

可能此代码对您有所帮助。我正在使用平移手势更改 View (panView) 高度约束。

@IBOutlet weak var h: NSLayoutConstraint!
@IBOutlet weak var panView: UIView!

override func viewDidLoad() {
    super.viewDidLoad()
    let gesture = UIPanGestureRecognizer(target: self, action: #selector(self.pan(_))
    panView.addGestureRecognizer(gesture)
}

@objc func pan(_ pan: UIPanGestureRecognizer) {

    let translation = pan.translation(in: panView)

    if pan.state == .began {
    } else if pan.state == .changed {
        h.constant = h.constant - translation.y
        pan.setTranslation(CGPoint.zero, in: panView)
    } else if pan.state == .ended {
        // You can handle this how you want.
    }
}

关于ios在 View 中添加panGesture，更改 View 框架，但不流畅，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41479393/