Swift-设置可见菜单控制器

Question

我试图显示一个UimenuController，但我无法查看它。我能怎么做？

let MenuController: UIMenuController = UIMenuController.sharedMenuController() 
MenuController.menuVisible = true 
MenuController.arrowDirection = UIMenuControllerArrowDirection.Down 
MenuController.setTargetRect(CGRectMake(100, 80, 50, 50), inView: self.view) 
let MenuItem_1: UIMenuItem = UIMenuItem(title: "Menu", action: "delete:") 
let MenuItems: NSArray = [delete] 
MenuController.menuItems = MenuItems 

Answer 1

为了居然要显示你需要做以下菜单：

1. 呼叫becomeFirstResponder（）你得到你sharedMenuController前
2. 呼叫menu.setMenuVisible（真，动画： true）
3. 重写canBecomeFirstResponder函数
4. 重写canPerformAction函数
5. 编写函数用于选择器

下面是一个例子

func someFunc() { 
    becomeFirstResponder() 
    var menu = UIMenuController.sharedMenuController() 
    var deleteItem = UIMenuItem(title: "Delete me", action: Selector("deleteLine")) 
    menu.menuItems = [deleteItem] 
    menu.setTargetRect(CGRectMake(100, 80, 50, 50), inView: self) 
    menu.setMenuVisible(true, animated: true) 
} 

func deleteLine() { 
    //Do something here 
} 

override func canBecomeFirstResponder() -> Bool { 
    return true 
} 

override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool { 
    // You need to only return true for the actions you want, otherwise you get the whole range of 
    // iOS actions. You can see this by just removing the if statement here. 
    if action == Selector("deleteLine") { 
     return true 
    } 
    return false 
} 

Answer 2

夫特3版本代码：

func someFunc() { 
    becomeFirstResponder() 
    var menu = UIMenuController.shared 
    var deleteItem = UIMenuItem(title: "Delete me", action: #selector(ViewController.deleteLine)) 
    menu.menuItems = [deleteItem] 
    menu.setTargetRect(CGRect(x: 0.0, y: 0.0, width: 20, height: 20), in: self) 
    menu.setMenuVisible(true, animated: true) 
} 

func deleteLine() { 
    //Do something here 
} 

override var canBecomeFirstResponder: Bool { 

     return true 
    } 

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool { 
     // You need to only return true for the actions you want, otherwise you get the whole range of 
     // iOS actions. You can see this by just removing the if statement here. 
     if action == #selector(ViewController.deleteLine) { 
      return true 
     } 

     return false 
    }