How to use two navigation controller in one app

i am new to ios.. i am making the app which load first login page and after login its display home view controller. and in my home view controller i am using this slidebar.. so how can i manage rootcontroller of navigation?? here is my code

IQKeyboardManager.sharedManager().enable = true
IQKeyboardManager.sharedManager().shouldShowTextFieldPlaceholder = false
window = UIWindow(frame: UIScreen.mainScreen().bounds)
storyboard = UIStoryboard(name: "Main", bundle: nil)
let controller:ViewController = self.storyboard.instantiateViewControllerWithIdentifier("ViewController") as! ViewController
navigation = UINavigationController(rootViewController: controller)
window?.rootViewController = navigation

```
window?.makeKeyAndVisible()
```

and for slidebar

```
let mainViewController = storyboard.instantiateViewControllerWithIdentifier("SelectbusViewController") as! SelectbusViewController
let leftViewController = storyboard.instantiateViewControllerWithIdentifier("LeftViewController") as! LeftViewController

let slideMenuController = SlideMenuController(mainViewController: mainViewController, leftMenuViewController: leftViewController)

let appdelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let slidernavigation = UINavigationController(rootViewController: slideMenuController)
appdelegate.window?.rootViewController = slidernavigation
appdelegate.window?.makeKeyAndVisible()
```

so how can i manage both of this???

Start by tracing the AppDelegate setup and the two root-controller snippets, including ViewController, SelectbusViewController, LeftViewController, SlideMenuController, and the two UINavigationController instances. Determine how the login-to-home transition and slide menu are intended to coexist; done should be a clear documented navigation setup that answers how both controllers are managed.

Written by the indexing model from the issue text.