Xcode 11.3, UInavigationController and UITabbarController facing issues

Brief: I have 4 controllers embedded in UINavigationController, who are then used as tabs in UITabbarController, (No storyboards and .xib's) through code.

Previously I was using Xcode 10.3, there were no issues but after I changed to 11.3 these issues came up.

Issues:

1. when I tap on the tabs, viewWillAppear, and viewDidAppear on the controllers are not getting called.

2. similar issue with navigation controller https://stackoverflow.com/q/58254034/5247034

3. Pop back (pressing back button) from any controller after navigating to it is not getting animated.

Code TabbarController:

final class TabBarController: UITabBarController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.viewControllers = [
            TabBarItems.home.tabController,
            TabBarItems.search.tabController,
            TabBarItems.cart.tabController,
            TabBarItems.account.tabController
        ]
        
        self.tabBar.isTranslucent = false
    }
}

extension TabBarController {
    enum TabBarItems {
        case home
        case search
        case cart
        case account
        
        var title: String {
            switch self {
            
            case .home:
                return "Home"
            case .search:
                return "Search"
            case .cart:
                return "Bag"
            case .account:
                return "Account"
            }
        }
        
        var tabController: UINavigationController {
            switch self {
            
            case .home:
                return createNavController(viewController: HomeController(), title: self.title, imageName: Assets.home.rawValue)
            case .search:
                return createNavController(viewController: UIViewController(), title: self.title, imageName: Assets.search.rawValue)
            case .cart:
                return createNavController(viewController: BagController(), title: self.title, imageName: Assets.shoppingBag.rawValue)
            case .account:
                return createNavController(viewController: AccountController(), title: self.title, imageName: Assets.account.rawValue)
            }
        }
        
        private func createNavController(viewController: UIViewController, title: String, imageName: String) -> UINavigationController {
            let navController = UINavigationController(rootViewController: viewController)
            viewController.view.backgroundColor = .white
            navController.tabBarItem.title = title
            navController.tabBarItem.image = imageName.image
            return navController
        }
    }
}

The issue was with a project created in XCode 10.3 and trying to run it out of the box in XCode 11+.

As prior to iOS 13/ XCode11, the apps starting point was AppDelegate but now in Xcode 11+, SceneDelegate shared some of the responsibility. i.e. the window configuration should be done in scene(:willConnectTo:) function.

I forgot to add SceneDelegate.swift and Info.plist key for that.

Thanks @DonMag for helping me out.