slide out called in bar button (swift)

 @IBOutlet var menu_BarButton: UIBarButtonItem!
    override func viewDidLoad() {
        super.viewDidLoad()

        if self.revealViewController() != nil {
            menu_BarButton.target = self.revealViewController()
            menu_BarButton.action = #selector(SWRevealViewController.revealToggle(_:))
            self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
            self.view.addGestureRecognizer(self.revealViewController().tapGestureRecognizer())
        }
        

    }

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