在swift中访问navigationController子视图的项

新手到ios应用程序编码在这里，所以任何帮助将不胜感激

我有一个应用程序，当旋转到横向时会自动打开一个侧菜单，我需要它来禁用navigationController子视图中的菜单按钮。这是我的密码

导航控制器

import Foundation
class GDNavigationController:UINavigationController{
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        //Send notification when the device is rotated.
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "rotated", name: UIDeviceOrientationDidChangeNotification, object: nil)
    }

    func rotated(){
        /*
        Put the code here to access the menu button
        */
        if(UIDeviceOrientationIsLandscape(UIDevice.currentDevice().orientation))
        {
            //disable the menu button here
            self.revealViewController().setFrontViewPosition(FrontViewPosition.Right, animated: false)
        }

        if(UIDeviceOrientationIsPortrait(UIDevice.currentDevice().orientation))
        {
            //enable the menu button here
            self.revealViewController().setFrontViewPosition(FrontViewPosition.Left, animated: false)
        }
    }
}

我的ViewController代码

import Foundation
class LocalCollectionController: UICollectionViewController{      
    @IBOutlet var MenuViewButton: UIBarButtonItem!
    override func viewDidLoad() {
        MenuViewButton.target = self.revealViewController()
        MenuViewButton.action = Selector("revealToggle:")
    }  
}

我有不同的NavigationController，根据选择的菜单项加载不同的ViewController。不同的NavigationController共享相同的子类，但我不知道加载了哪个viewController，这就是我需要了解的内容以及如何访问该viewController中的按钮

---

有人能帮忙吗？

所以我想出来了，把我的导航控制器换成这个

进口基础 类GDNavigationController:UINavigationController{

var BBItem = UIBarButtonItem()
override func viewDidAppear(animated: Bool) {
    BBItem = self.topViewController.navigationItem.leftBarButtonItem!

}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    //Send notification when the device is rotated.
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "rotated", name: UIDeviceOrientationDidChangeNotification, object: nil)
    self.rotated()
}


func rotated(){

    if(UIDeviceOrientationIsLandscape(UIDevice.currentDevice().orientation))
    {
        self.revealViewController().setFrontViewPosition(FrontViewPosition.Right, animated: true)
        self.BBItem.enabled = false
    }

    if(UIDeviceOrientationIsPortrait(UIDevice.currentDevice().orientation))
    {
        self.revealViewController().setFrontViewPosition(FrontViewPosition.Left, animated: true)
        self.BBItem.enabled = true
    }

}

}