控制器中的 UIView 触摸事件答案

【问题标题】：UIView touch event in controller控制器中的 UIView 触摸事件
【发布时间】：2015-08-10 21:05:49
【问题描述】：

由于 Xcode 未从 Main.storyboard 提供，我如何以编程方式添加 UIView touchbegin 操作或 touchend 操作？

【问题讨论】：

那个是按钮，OP想为UIView添加事件
使用UILongPressGestureRecognizer 并将minimumPressDuration 设置为零。 See this answer. 它不需要继承或覆盖任何东西。

【解决方案1】：

您必须通过代码添加它。试试这个：

    // 1.create UIView programmetically
    var myView = UIView(frame: CGRectMake(100, 100, 100, 100))
    // 2.add myView to UIView hierarchy
    self.view.addSubview(myView) 
    // 3. add action to myView
    let gesture = UITapGestureRecognizer(target: self, action: "someAction:")
    // or for swift 2 +
    let gestureSwift2AndHigher = UITapGestureRecognizer(target: self, action:  #selector (self.someAction (_:)))
    self.myView.addGestureRecognizer(gesture)

    func someAction(sender:UITapGestureRecognizer){     
       // do other task
    }

    // or for Swift 3
    func someAction(_ sender:UITapGestureRecognizer){     
       // do other task
    }

    // or for Swift 4
    @objc func someAction(_ sender:UITapGestureRecognizer){     
       // do other task
    }

    // update for Swift UI

    Text("Tap me!")
        .tapAction {
             print("Tapped!")
        }

【讨论】：

我已经做到了，当我点击 uiView 时它给了我一个错误。我的代码： let gesture = UITapGestureRecognizer(target: self.uiPendingView, action: "touchPending") self.uiPendingView.addGestureRecognizer(gesture) 和方法： func touchPending(sender: AnyObject) { println("METHOD>>>>>>> >>>>>>>>>>") }
只需在 "touchPending:" ans 函数中添加：它看起来像 func touchPending(sender: UITapGestureRecognizer)
你在行动中缺少':'。
您好，当 UIView 都具有相同的 someAction 函数时，如何区分点击了哪个 UIView？
最简单的方法是使用标签属性，然后在函数中确定哪个视图是发件人

【解决方案2】：

Swift 4 / 5：

let gesture = UITapGestureRecognizer(target: self, action:  #selector(self.checkAction))
self.myView.addGestureRecognizer(gesture)

@objc func checkAction(sender : UITapGestureRecognizer) {
    // Do what you want
}

斯威夫特 3：

let gesture = UITapGestureRecognizer(target: self, action:  #selector(self.checkAction(sender:)))
self.myView.addGestureRecognizer(gesture)

func checkAction(sender : UITapGestureRecognizer) {
    // Do what you want
}

【讨论】：

应从 VIEWDIDLOAD 调用前 2 行！

【解决方案3】：

更新@Crashalot 对 Swift 3.x 的回答：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let currentPoint = touch.location(in: self)
        // do something with your currentPoint
    }
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let currentPoint = touch.location(in: self)
        // do something with your currentPoint
    }
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let currentPoint = touch.location(in: self)
        // do something with your currentPoint
    }
}

【讨论】：

【解决方案4】：

更新@Chackle 对 Swift 2.x 的回答：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    if let touch = touches.first {
        let currentPoint = touch.locationInView(self)
        // do something with your currentPoint
    }
}

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    if let touch = touches.first {
        let currentPoint = touch.locationInView(self)
        // do something with your currentPoint
    }
}

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    if let touch = touches.first {
        let currentPoint = touch.locationInView(self)
        // do something with your currentPoint
    }
}

【讨论】：

【解决方案5】：

把它放在你的UIView 子类中（如果你为此功能创建一个子类是最简单的）。

class YourView: UIView {

  //Define your initialisers here

  override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    if let touch = touches.first as? UITouch {
      let currentPoint = touch.locationInView(self)
      // do something with your currentPoint
    }
  }

  override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
    if let touch = touches.first as? UITouch {
      let currentPoint = touch.locationInView(self)
      // do something with your currentPoint
    }
  }

  override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
    if let touch = touches.first as? UITouch {
      let currentPoint = touch.locationInView(self)
      // do something with your currentPoint
    }
  }
}

【讨论】：

@Chacle，我的页面中有超过 10 个 Uiview，我想在一些 Sub UIView 中添加操作。那么为此我应该改变什么？
这取决于你想用它做什么。您想知道您按的是哪个UIView，还是要在每个UIView 中处理一些压力？
我只想要一些特定 UIview 的 touchevent。

【解决方案6】：

对于 Swift 4

@IBOutlet weak var someView: UIView!  
let gesture = UITapGestureRecognizer(target: self, action:  #selector (self.someAction (_:)))
self.someView.addGestureRecognizer(gesture)

@objc func someAction(_ sender:UITapGestureRecognizer){
    print("view was clicked")
}

【讨论】：

【解决方案7】：

从 StoryBoard 中创建的视图创建出口。

@IBOutlet weak var redView: UIView!
@IBOutlet weak var orangeView: UIView!
@IBOutlet weak var greenView: UIView!

重写 touchesBegan 方法。有两种选择，大家可以自行判断哪一种更适合自己。

在特殊视图中检测触摸。

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
     if let touch = touches.first {
        if touch.view == self.redView {
            tapOnredViewTapped()
        } else if touch.view == self.orangeView {
            orangeViewTapped()
        } else if touch.view == self.greenView {
            greenViewTapped()
        } else {
            return
        }
    }

}

在特殊视图上检测触摸点。

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let location = touch.location(in: view)
        if redView.frame.contains(location) {
            redViewTapped()
        } else if orangeView.frame.contains(location) {
            orangeViewTapped()
        } else if greenView.frame.contains(location) {
            greenViewTapped()
        }
    }

}

最后，您需要声明将调用的函数，具体取决于用户单击的视图。

func redViewTapped() {
    print("redViewTapped")
}

func orangeViewTapped() {
    print("orangeViewTapped")
}

func greenViewTapped() {
    print("greenViewTapped")
}

【讨论】：

非常好的例子，感谢向我展示！我们也可以使用 touchEvent 来做到这一点。我只知道按钮和手势两种方式。谢谢+1
顺便说一下，这种触摸在模拟器中不起作用。所以如果你在模拟器上工作，你不能测试代码。

【解决方案8】：

你可以这样使用：创建扩展

extension UIView {

    func addTapGesture(action : @escaping ()->Void ){
        let tap = MyTapGestureRecognizer(target: self , action: #selector(self.handleTap(_:)))
        tap.action = action
        tap.numberOfTapsRequired = 1

        self.addGestureRecognizer(tap)
        self.isUserInteractionEnabled = true

    }
    @objc func handleTap(_ sender: MyTapGestureRecognizer) {
        sender.action!()
    }
}

class MyTapGestureRecognizer: UITapGestureRecognizer {
    var action : (()->Void)? = nil
}

并以这种方式使用：

@IBOutlet weak var testView: UIView!
testView.addTapGesture{
   // ...
}

【讨论】：

【解决方案9】：

斯威夫特 4.2：

@IBOutlet weak var viewLabel1: UIView!
@IBOutlet weak var viewLabel2: UIView!
  override func viewDidLoad() {
    super.viewDidLoad()

    let myView = UITapGestureRecognizer(target: self, action: #selector(someAction(_:)))
    self.viewLabel1.addGestureRecognizer(myView)
}

 @objc func someAction(_ sender:UITapGestureRecognizer){
   viewLabel2.isHidden = true
 }

【讨论】：

【解决方案10】：

只是对上述答案的更新：

如果您想看到点击事件的变化，即当用户点击 UIView 时 UIVIew 的颜色会发生变化，然后进行如下更改...

class ClickableUIView: UIView {
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
            if let touch = touches.first {
                let currentPoint = touch.locationInView(self)
                // do something with your currentPoint
            }

            self.backgroundColor = UIColor.magentaColor()//Color when UIView is clicked.
        }

        override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
            if let touch = touches.first {
                let currentPoint = touch.locationInView(self)
                // do something with your currentPoint
            }

            self.backgroundColor = UIColor.magentaColor()//Color when UIView is clicked.
        }

        override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
            if let touch = touches.first {
                let currentPoint = touch.locationInView(self)
                // do something with your currentPoint
            }

            self.backgroundColor = UIColor.whiteColor()//Color when UIView is not clicked.

}//class closes here

另外，从 Storyboard 和 ViewController 中调用这个类：

@IBOutlet weak var panVerificationUIView:ClickableUIView!

【讨论】：

【解决方案11】：

更新@stevo.mit 对 Swift 4.x 的回答：

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let currentPoint = touch.location(in: self.view)
        // do something with your currentPoint
    }
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let currentPoint = touch.location(in: self.view)
        // do something with your currentPoint
    }
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let currentPoint = touch.location(in: self.view)
        // do something with your currentPoint
    }
}

【讨论】：