Displaying View Controller within a UITabBarController programatically in Swift 5

Question

In my app when the user logs in, they should be taken to a welcome screen, which is part of a TabBarController. But for some reason, when I run the following lines, the welcome screen (HomeScreenViewController) shows up without the TabBar navigation buttons at the bottom.

let homeViewController = self.storyboard?.instantiateViewController(identifier: Constants.Storyboard.homeViewController) as? HomeScreenViewController
self.view.window?.rootViewController = homeViewController
self.view.window?.makeKeyAndVisible()

Inspired by another StackOverflow post, I tried this, but it didn't work either:

let homeController = self.storyboard?.instantiateViewController(identifier:Constants.Storyboard.homeViewController)
(TabBarController.currentInstance?.selectedViewController as?UINavigationController)?.pushViewController(homeController!, animated: true)

For reference, the name of my UITabBarController class is TabBarController and the identifier can be accessed via

Constants.Storyboard.tabBarCont

Thanks!

Answer 1

I think you can try this..

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
            // Override point for customization after application launch.
        window = UIWindow(frame: UIScreen.main.bounds)

        let tabBarController = UITabBarController()

let homeViewController = self.storyboard?.instantiateViewController(identifier: Constants.Storyboard.homeViewController) as? HomeScreenViewController
let anyOtherViewController = self.storyboard?.instantiateViewController(identifier: anyOtherViewController) as? AnyOtherViewController

        homeViewController.tabBarItem = UITabBarItem(title: "Home", image: UIImage(named: "home_image"),tag: 1)
        anyOtherViewController.tabBarItem = UITabBarItem(title: "Other",image:UIImage(named: "other") ,tag:2)
        tabBarController.viewControllers = [homeViewController, anyOtherViewController] 

        window?.rootViewController = tabBarController
        window?.makeKeyAndVisible()
        return true
     }