控制器中的UIView触摸事件

Question

如何以编程方式添加UIView touchbegin动作或touchend动作,因为Xcode不是从Main.storyboard提供的？

Answer 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!")
        }

Answer 2

Swift 4的更新:

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

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

Swift 3更新:

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

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

Answer 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
    }
}

Answer 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
    }
}

Answer 5

从在 StoryBoard 中创建的视图创建插座。

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

覆盖 touchesBegan 方法。有2个选择，每个人都可以决定哪个更适合他。

1. 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
           }
       }
   
   }
   

2. 在特殊视图上检测触点。

   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，您需要声明将被调用的函数，具体取决于用户单击的视图。

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

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

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

Answer 6

把它放在你的UIView子类中(如果你为这个功能做了一个sublcass,这是最简单的).

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
    }
  }
}

Answer 7

对于迅捷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")
}

Answer 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
}

并使用这种方式：

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

Answer 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
 }