Navigation Bar Items disappearing while using MMDrawerController - ios

Question

I am using MMDrawerController to navigate through various views in my app one of which is a TabBarController which has 5 further views linked to each of its 5 bar items. Each of those 5 views have navigation bar items attached to them. The left bar Item on each of these 5 views toggles the LeftViewController (The view that I use as my drawer). I am using this code in my AppDelegate to achieve this
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var centerViewController = mainStoryboard.instantiateViewControllerWithIdentifier("TabBarController") as! TabBarController
var leftViewController = mainStoryboard.instantiateViewControllerWithIdentifier("LeftViewController") as! LeftViewController
var leftsideNav = UINavigationController(rootViewController: leftViewController)
var centerNav = UINavigationController(rootViewController: centerViewController)
centerContainer = MMDrawerController(centerViewController: centerViewController, leftDrawerViewController: leftViewController)
centerContainer!.closeDrawerGestureModeMask = MMCloseDrawerGestureMode.PanningCenterView
and I am calling this method when the left bar buttons are tapped on the 5 ViewControllers
#IBAction func leftButtonTapped(sender: AnyObject) {
var appDelegate:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
appDelegate.centerContainer!.toggleDrawerSide(MMDrawerSide.Left, animated: true, completion: nil)
}
Works perfectly so far.
Now I have a tableView in my LeftViewController in which I wish to achieve the following behaviour - clicking on the first row navigates us to the TabBarController while the second row takes us to another ViewController and with withFullCloseAnimation set to true.
Here is the code in the didSelectRowAtIndexPath method of the LeftViewController's tableView
var appDelegate:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var centerViewController = mainStoryboard.instantiateViewControllerWithIdentifier("TabBarController") as! TabBarController
var centerNav = UINavigationController(rootViewController: centerViewController)
appDelegate.centerContainer?.setCenterViewController(centerNav, withFullCloseAnimation: true, completion: nil)
appDelegate.centerContainer!.toggleDrawerSide(MMDrawerSide.Left, animated: true, completion: nil)
break;
This makes the navigation bar items of the 5 views in the TabBarController disappear. It works fine if I use this -
var appDelegate:AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
appDelegate.centerContainer!.toggleDrawerSide(MMDrawerSide.Left, animated: true, completion: nil)
break;
The last bit of code makes me think it is initiating the TabBarController all over again rather than 'restoring' the one that had already been initalised. Is that so?
What should be the right way to achieve this?
Sorry for the length of the question (just increased it further by typing this)

Answer 1

I added .navigationController
in the didSelectRowAtIndexPath indexPath: NSIndexPath)
appDelegate.centerContainer!.centerViewController centerViewController.navigationController
break;