原来这个组件是UIMenuController

/**
 长按事件 
 */
func longPressGestureAction(sender:UILongPressGestureRecognizer){
    if sender.state != UIGestureRecognizerState.Began {
        return
    }
    print("longPressGestureAction+++++++++++++++++ \(sender.state.rawValue)")
    
    // 1. first responder
    v.becomeFirstResponder()
    
    // 2. 获取菜单
    let menu = UIMenuController.sharedMenuController()
    if menu.menuVisible == false{
        // 3. 设置自定义菜单
        let item = UIMenuItem(title: "啦啦啦", action: #selector(self.lalaAction(_:)))
        menu.menuItems = [ item ]
        
        // 4. 菜单显示位置
        menu.setTargetRect(v.bounds, inView: v)
        
        // 5. 显示菜单
        menu.setMenuVisible(true, animated: true)
    }
}
func lalaAction(sender:AnyObject?){
    
}
/// 具备成为第一响应者的资格
override func canBecomeFirstResponder() -> Bool {
    return true
}
/**
 *  这个方法决定了MenuController的菜单项内容
 *  返回YES，就代表MenuController会有action菜单项
 */
override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool {
    print("canPerformAction +++++ \(action)")
    // 判断 action 中包含的各个事件的方法名称, 对比上了才能显示
    if (action == #selector(NSObject.copy(_:)) || action == #selector(self.lalaAction(_:)))
    {
        return true
    }
    return false
}