一、基本使用

UITextView、UIWebView、UITextField 默认是支持UIMenuController的

截屏2020-04-02 下午1.52.03.png

而UILable是不支持UIMenuController的，需要手动实现。

UIMenuController的展现需要基于一个View视图，其交互则需要基于其所在View视图的Responder,使View成为第一响应者。在界面展示UIMenuController 必须需要实现两个方法

01、成为第一相应响应者
  override var canBecomeFirstResponder: Bool{
        return true
    }只有成为第一响应者，才能触发02方法的执行

02、是否可以接收某些菜单的某些交互操作（剪切、复制、粘贴、删除等）
    override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {

       return true
    }
 

1.1、UILable实现编辑菜单

• UIMenuController

class MyLable: UILabel {
  override var canBecomeFirstResponder: Bool{
      return true
  }
  override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
      if action  == #selector(UIResponderStandardEditActions.cut(_:)) || action  == #selector(UIResponderStandardEditActions.paste(_:)) || action  == #selector(UIResponderStandardEditActions.copy(_:))  {
          return true
      }
    
      return false
      
   }
  
  override func cut(_ sender: Any?) {
      // 将自己的文字复制到粘贴板
      self.copy(sender)
      
      self.text = nil
  }

  
  override func copy(_ sender: Any?) {
       let pasteboard = UIPasteboard.general
      pasteboard.string = self.text
  }
  
  override func paste(_ sender: Any?) {
      let pasteboard = UIPasteboard.general
      self.text = pasteboard.string
  }
  

  override init(frame: CGRect) {
      super.init(frame: frame)
      self.isUserInteractionEnabled = true
      let tapgesture = UITapGestureRecognizer(target: self, action: #selector(tapGestureClick(gesture:)))
      self.addGestureRecognizer(tapgesture)
  }
  
 @objc private func tapGestureClick(gesture:UITapGestureRecognizer){

   self.becomeFirstResponder()
       if #available(iOS 16.0, *){
       let menuConfiguration =   UIEditMenuConfiguration(identifier: nil, sourcePoint:CGPoint(x:self.frame.size.width/2  , y: self.frame.height))
       menuConfiguration.preferredArrowDirection = .up
     let  menuInteraction = UIEditMenuInteraction(delegate: nil)
       self.addInteraction(menuInteraction)
       menuInteraction.presentEditMenu(with: menuConfiguration)
   }else  if #available(iOS 13.0, *){
       let menuContoller = UIMenuController.shared
      guard menuContoller.isMenuVisible == false else{return}
       menuContoller.showMenu(from: self, rect: self.bounds)
   }else{
       // targetRect: MenuController需要指向的矩形框
         // targetView: targetRect会以targetView的左上角为坐标原点
       let menuContoller = UIMenuController.shared
      guard menuContoller.isMenuVisible == false else{return}
       menuContoller.setMenuVisible(true, animated: true)

       menuContoller.setTargetRect(self.frame, in: self.superview!)
   }
  }
  
  required init?(coder: NSCoder) {
      fatalError("init(coder:) has not been implemented")
  }

}

• UIMenuController 自定义

class MyLable: UILabel {
    override var canBecomeFirstResponder: Bool{
        return true
    }
    
    override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
        if action == #selector(mydelete){
            return true
        }
        return false
     }


    override init(frame: CGRect) {
        super.init(frame: frame)
        self.isUserInteractionEnabled = true
        let tapgesture = UITapGestureRecognizer(target: self, action: #selector(tapGestureClick(gesture:)))
        self.addGestureRecognizer(tapgesture)
    }
    
   @objc private func tapGestureClick(gesture:UITapGestureRecognizer){
    self.becomeFirstResponder()
    let menuContoller = UIMenuController.shared
     if #available(iOS 13.0, *) {
        menuContoller.showMenu(from: self, rect: self.bounds)
      } else {
        menuContoller.setMenuVisible(true, animated: true)
        
        menuContoller.setTargetRect(self.frame, in: self.superview!)
      }
    
    let menu =  UIMenuItem(title: "我的删除", action:#selector(mydelete))
    menuContoller.menuItems = [menu]
    
    }
   @objc  func mydelete(){
          
          
    }
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}