setup DrawerController with a UITabBar

gistfile1.txt

DispatchQueue.main.async {
            // Init Drawer
            let appDelegate = UIApplication.shared.delegate as! AppDelegate
            let storyBoard = UIStoryboard.init(name: "Main", bundle: Bundle.main)
            let navVC = storyBoard.instantiateViewController(withIdentifier: "MainController") as! MyTabBarController
            navVC.loggedAlready = true
            // is the main controller for the drawer.
            let drawerVC = storyBoard.instantiateViewController(withIdentifier: "DrawerVC")
            // is the drawer, and the drawer needs a main controller
            appDelegate.drawerController.mainViewController = navVC
            appDelegate.drawerController.drawerViewController = drawerVC
            appDelegate.drawerController.drawerDirection = .right
            appDelegate.window?.rootViewController = appDelegate.drawerController
            appDelegate.window?.makeKeyAndVisible()
        }