ViewController.swift

import Cocoa

class ViewController: NSViewController {

    @IBOutlet weak var tb: NSTableView!
    override func viewDidLoad() {
        super.viewDidLoad()
        let ctxm = NSMenu()
        tb.menu = ctxm
        ctxm.delegate = self
    }

    override var representedObject: Any? {
        didSet {
        }
    }

    
}

final class Action:NSObject {
    private let _action: ()->()
    
    init (_ action: @escaping ()->()) {
        self._action = action
        super.init()
    }
    
    @objc func action () {
        _action()
    }
}

final class WhatEver: NSObject {
    
    private let _closure: () -> ()
    
    init(_ closure: @escaping () -> ()) {
        self._closure = closure
        super.init()
    }
    
    @objc func invoke() {
        _closure()
    }
    
}

extension ViewController:NSMenuDelegate {
    func menuWillOpen(_ menu: NSMenu) {
        menu.removeAllItems()
        
        let item2 = NSMenuItem()
        item2.title = "Item_2"
        let closure = WhatEver({print("xxx")})
        item2.target = closure
        item2.action = #selector(closure.invoke)
        objc_setAssociatedObject(self, String(format: "[%d]", arc4random()), closure, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
        menu.addItem(item2)
      
        let item1 = NSMenuItem()
        item1.title = "Item_1"
        let action = Action({print("xxx")})
        item1.target = action
        item1.action = #selector(action.action)
        objc_setAssociatedObject(self, String(format: "[%d]", arc4random()), action, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
        menu.addItem(item1)
    }
}