UIMenuController没有显示菜单 [英] UIMenuController not showing up the menu

问题描述

我是iOS新手。我正在尝试显示弹出菜单，但有些我无法显示菜单。请帮忙。
这是我的代码：

I am very new to iOS. I am trying to show a pop up menu,but some how I am unable to display menu. Please help. Here is my code:

//DidLoad function to initialize UILongPRessGestureRecognizer

override func viewDidLoad()  
{     
        super.viewDidLoad()  
        var longprss : UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: Selector("display:"))   
        self.tableView.addGestureRecognizer(longprss)   
}



   //Bool function Can become first responder set to true

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

 //become first responser set to true
   override func becomeFirstResponder() -> Bool {
        return true
    }
    //action handler of longPressGesture

    func display(gesture: UILongPressGestureRecognizer)
    {

        self.becomeFirstResponder()
        println("Is first responder")

        var menu = UIMenuController.sharedMenuController()
        var deleteItem = UIMenuItem(title: "Delete", action: Selector("deleteLine"))
        var editItems = UIMenuItem(title: "Edit", action: Selector("editrow"))
        menu.menuItems = [deleteItem ,editItems]

        menu.setTargetRect(CGRect(x: 100, y: 80, width: 100, height: 50), inView: UIView())
        menu.setMenuVisible(true, animated: true)

    }

//perform action method
override func tableView(tableView: UITableView, performAction action: Selector, forRowAtIndexPath indexPath: NSIndexPath, withSender sender: AnyObject!) {

}
//can perform action method.

    override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool {
        if action == Selector("Delete")
        {
            return true
        }
        return false
    }

请帮我显示弹出菜单。

提前谢谢。

推荐答案

//View controller class which is implementing TableViewCellDelegate
//Make sure you do followng
//subclass UITableViewCell using class name TableViewCell which has delegate
//you link UITableViewCell in ViewController class with TableViewCell in Custom Class column in interface builder(storyboard)
//In TableViewCell cell identifier you give name as Cell.


class ViewController: UITableViewController,TableViewCellDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.



    }

// tableview delegates
  override  func numberOfSectionsInTableView(tableView: UITableView) -> Int // Default is 1 if not
    {

        return 1;
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 10
    }
     override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
     {

        var cell = tableView.dequeueReusableCellWithIdentifier("Cell") as? TableViewCell


        if cell == nil {
            cell = TableViewCell(style: UITableViewCellStyle.Value1, reuseIdentifier: "Cell")
        }
        cell?.delegate=self;
        cell?.textLabel?.text="Cell text"
        return cell!

    }

     func tableCellSelected(tableCell: UITableViewCell)
     {

        var longprss : UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: Selector("display:"))
        tableCell.addGestureRecognizer(longprss)

     }
    //end tableview delegate


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



    override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool
    {
        println(action);
        if(action == Selector("deleteLine:") || action == Selector("editRow:"))
        {
            return true;

        }
        else
        {
            return false;
        }
    }

    func deleteLine(sender: AnyObject?) {

        println("delete line")

    }

    func editRow(sender: AnyObject?) {

        println("edit row");
    }

    //end menu delegate

    //action handler of longPressGesture

    func display(gesture: UILongPressGestureRecognizer)
    {

        gesture.view?.becomeFirstResponder()

        println("Is first responder")
        var menu = UIMenuController.sharedMenuController()
        var deleteItem = UIMenuItem(title: "Delete", action: Selector("deleteLine:"))
        var editItems = UIMenuItem(title: "Edit", action: Selector("editRow:"))
        menu.menuItems = [deleteItem ,editItems]

        menu.setTargetRect(CGRect(x: 30, y: 8, width: 100, height: 50), inView: gesture.view!)
        menu.setMenuVisible(true, animated: true)

    }



    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }




}

//This is subclass of UITableViewCell

protocol TableViewCellDelegate
{
    func tableCellSelected( var tableCell : UITableViewCell)
}


class TableViewCell: UITableViewCell {

    var delegate : TableViewCellDelegate?

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
        if((self.delegate) != nil)
        {
            delegate?.tableCellSelected(self);
        }
        // Configure the view for the selected state
    }

}

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