Presenting a custom tab view controller but getting a black screen - ios

Question

My goal is to display a tab view controller that manages multiple tabs that consist of navigation controllers containing view controllers.
I set the tab view controller BaseTabBarController as window my root view controller in AppDelegate. My custom tab view controller looks like this:
class BaseTabBarController: ESTabBarController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .red
let v1 = BaseNavigationController(rootViewController: SubscriptionsController())
let v2 = BaseNavigationController(rootViewController: SubscriptionsController())
v1.tabBarItem = ESTabBarItem(title: "Home", image: #imageLiteral(resourceName: "tab_bar_home"), selectedImage: #imageLiteral(resourceName: "tab_bar_home"))
v2.tabBarItem = ESTabBarItem(title: "Home", image: #imageLiteral(resourceName: "tab_bar_home"), selectedImage: #imageLiteral(resourceName: "tab_bar_home"))
self.viewControllers = [v1, v2]
self.hidesBottomBarWhenPushed = true
}
}
My custom navigation controller class is an empty subclass of a navigation controller.
The problem is that the app displays a tab bar for a fraction of a second, and immediately turns into a black screen (console message: "Presenting view controllers on detached view controllers is discouraged"). What did I do wrong?

Answer 1

there has got to be something wrong with some other parts of your code. when i take your code and use it like this everything works as expected:
class BaseTabBarController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .red
let v1 = UINavigationController(rootViewController: UIViewController())
let v2 = UINavigationController(rootViewController: UIViewController())
v1.tabBarItem = UITabBarItem(title: "Home", image: nil, selectedImage: nil)
v2.tabBarItem = UITabBarItem(title: "Home", image: nil, selectedImage: nil)
self.viewControllers = [v1, v2]
self.hidesBottomBarWhenPushed = true
}
}
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
window = UIWindow(frame: UIScreen.main.bounds)
window?.rootViewController = BaseTabBarController()
window?.makeKeyAndVisible()
return true
}