Swift：在滑动手势上移动 UIView答案

【问题标题】：Swift: move UIView on slide gestureSwift：在滑动手势上移动 UIView
【发布时间】：2016-05-15 06:26:29
【问题描述】：

我正在尝试将 UIView 上滑动手势从其初始位置移动到固定的最终位置。图像应该随着手势移动，而不是独立动画。

我没有尝试过任何事情，因为我不知道从哪里开始，使用哪个手势类。

【问题讨论】：

github.com/PrashantKT/BottomCardView

标签： ios iphone swift uiview uiviewanimation

【解决方案1】：

终于像下面这样了。

let gesture = UIPanGestureRecognizer(target: self, action: Selector("wasDragged:"))
slideUpView.addGestureRecognizer(gesture)
slideUpView.userInteractionEnabled = true
gesture.delegate = self

当检测到手势时，会调用以下函数（这里我将视图限制为最大 center.y 为 555，并且当视图移过该点时，我将重置回 554）

func wasDragged(gestureRecognizer: UIPanGestureRecognizer) {
    if gestureRecognizer.state == UIGestureRecognizerState.Began || gestureRecognizer.state == UIGestureRecognizerState.Changed {
        let translation = gestureRecognizer.translationInView(self.view)
        print(gestureRecognizer.view!.center.y)
        if(gestureRecognizer.view!.center.y < 555) {
            gestureRecognizer.view!.center = CGPointMake(gestureRecognizer.view!.center.x, gestureRecognizer.view!.center.y + translation.y)
        }else {
            gestureRecognizer.view!.center = CGPointMake(gestureRecognizer.view!.center.x, 554)
        }

        gestureRecognizer.setTranslation(CGPointMake(0,0), inView: self.view)
    }

}

【讨论】：

工作正常:)
可拖动视图的初始状态是什么？

【解决方案2】：

您可能想使用UIPanGestureRecognizer。

let gesture = UIPanGestureRecognizer(target: self, action: Selector("wasDragged:"))
customView.addGestureRecognizer(gesture)
gesture.delegate = self

仅沿 y 轴拖动对象：

func wasDragged(gesture: UIPanGestureRecognizer) {
    let translation = gesture.translationInView(self.view)

    // Use translation.y to change the position of your customView, e.g.
    customView.center.y = translation.y // Customize this.
}

【讨论】：

好的，我会试一试。谢谢。
是的，明白了。我会尽力让你知道。

【解决方案3】：

斯威夫特 4：

@objc func wasDragged(_ gestureRecognizer: UIPanGestureRecognizer) {

    if gestureRecognizer.state == UIGestureRecognizer.State.began || gestureRecognizer.state == UIGestureRecognizer.State.changed {

        let translation = gestureRecognizer.translation(in: self.view)
        print(gestureRecognizer.view!.center.y)

        if(gestureRecognizer.view!.center.y < 555) {

            gestureRecognizer.view!.center = CGPoint(x: gestureRecognizer.view!.center.x, y: gestureRecognizer.view!.center.y + translation.y)

        }else {
            gestureRecognizer.view!.center = CGPoint(x:gestureRecognizer.view!.center.x, y:554)
        }
        gestureRecognizer.setTranslation(CGPoint(x: 0, y: 0), in: self.view)
    }
}

致电

let gesture = UIPanGestureRecognizer(target: self, action: self.wasDragged(gestureRecognizer:))
customView.addGestureRecognizer(gesture)
gesture.delegate = self

【讨论】：

我能问一下你为什么在 If check 上给出 555 吗？
EmreOnder 只是一个示例值。你可以用任何你想要的替换。
“MyViewController”类型的值没有成员“wasDragged(gestureRecognizer:)”
Hello Rails wasDragged 是在第一个代码 sn-p 中实现的函数
让手势 = UIPanGestureRecognizer(target: self, action: #selector(wasDragged(_:)))

【解决方案4】：

Swift 3.x 更新

分配选择器时，语法发生了变化，现在需要#selector

let gesture = UIPanGestureRecognizer(target: self, action: #selector(navViewDragged(gesture:)))

    self.navLayoutView.addGestureRecognizer(gesture)
    self.navLayoutView.isUserInteractionEnabled = true
    gesture.delegate = self

功能实现：

func navViewDragged(gesture: UIPanGestureRecognizer){
     //Code here
}

【讨论】：

【解决方案5】：

在 Swift 3 中移动视图

let panGesture = UIPanGestureRecognizer(target: self, action: #selector(dragged(gestureRecognizer:)))
demoView.isUserInteractionEnabled = true
demoView.addGestureRecognizer(panGesture)

功能

@objc func dragged(gestureRecognizer: UIPanGestureRecognizer) {
    if gestureRecognizer.state == UIGestureRecognizerState.began || gestureRecognizer.state == UIGestureRecognizerState.changed {
        let translation = gestureRecognizer.translation(in: self.view)
        gestureRecognizer.view!.center = CGPoint(x: gestureRecognizer.view!.center.x + translation.x, y: gestureRecognizer.view!.center.y + translation.y)
        gestureRecognizer.setTranslation(CGPoint(x: 0, y: 0), in: self.view)
    }
}

【讨论】：

【解决方案6】：

这就是股票应用中新闻视图的真正做法

首先在 Storyboard 中为滑动视图添加 2 个约束，一个用于完全打开时的状态，一个用于关闭时的状态。不要忘记禁用/未安装约束之一，以便在到达场景时您的视图看起来是打开或关闭的。在您的代码中引用它们

@IBOutlet weak var optionsOpenedConstraint: NSLayoutConstraint!
@IBOutlet weak var optionsVisiableConstraint: NSLayoutConstraint!

现在在viewDidLoad 函数中将UIPanGestureRecognizer 添加到您的视图中。

let gesture = UIPanGestureRecognizer(target: self, action: #selector(type(of: self).wasDragged(gestureRecognizer:)))
    optionsView.addGestureRecognizer(gesture)

最后添加这个回调和 2 个函数：

@objc func wasDragged(gestureRecognizer: UIPanGestureRecognizer) {
    let distanceFromBottom = screenHeight - gestureRecognizer.view!.center.y
    if gestureRecognizer.state == UIGestureRecognizer.State.began || gestureRecognizer.state == UIGestureRecognizer.State.changed {
        optionsOpenedConstraint.isActive = false
        optionsVisiableConstraint.isActive = false
        let translation = gestureRecognizer.translation(in: self.view)
        if((distanceFromBottom - translation.y) < 100) {
            gestureRecognizer.view!.center = CGPoint(x: gestureRecognizer.view!.center.x, y: gestureRecognizer.view!.center.y + translation.y)
            gestureRecognizer.setTranslation(CGPoint(x: 0, y: 0), in: self.view)
        }

    }
    if gestureRecognizer.state == UIGestureRecognizer.State.ended{
        if distanceFromBottom > 6{
            openOptionsPanel()
        }else{
            closeOptionsPanel()
        }
    }
}
func openOptionsPanel(){
    optionsOpenedConstraint.isActive = true
    optionsVisiableConstraint.isActive = false
    UIView.animate(withDuration: 0.5) {
        self.view.layoutIfNeeded()
    }
}

func closeOptionsPanel(){
    optionsOpenedConstraint.isActive = false
    optionsVisiableConstraint.isActive = true
    UIView.animate(withDuration: 0.5) {
        self.view.layoutIfNeeded()
    }
}

和voalá

【讨论】：

【解决方案7】：

@IBAction func handlePanGesture(_ recognizer: UIPanGestureRecognizer) {

    if MainView.bounds.contains(mainImage.frame) {
        let recognizerCenter = recognizer.location(in:  MainView)

        mainImage.center = recognizerCenter
    }

    if MainView.bounds.intersection(mainImage.frame).width > 50 && MainView.bounds.intersection(mainImage.frame).height > 0 {
        let recognizerCenter = recognizer.location(in: MainView)
        print(recognizerCenter)
        mainImage.center = recognizerCenter
    }

}

@IBAction func handlePinchGesture(_ recognizer: UIPinchGestureRecognizer) {

    mainImage.transform = mainImage.transform.scaledBy(x: recognizer.scale, y: recognizer.scale)
    recognizer.scale = 1.0
}

@IBAction func handleRotateGesture(_ recognizer: UIRotationGestureRecognizer) {

    mainImage.transform = mainImage.transform.rotated(by: recognizer.rotation)
    recognizer.rotation = 0.0

}

【讨论】：