Items of UITabBarController not showing - ios

Question

I am trying to implement bottom navigation bar for my iOS application. However, when I am creating tabBarItem, it is not showing on TabBar. TabBar is displaying correctly. I cannot figure out where is the problem, any help will be very appreciated.
If any additional information is required, please give me a sign. My code (simplified):
AppDelegate:
class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
window?.makeKeyAndVisible()
window?.rootViewController = TabBarController()
return true
}
}
TabBarController:
class TabBarController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
let homeController = HomeController()
let navigationController = UINavigationController(rootViewController: homeController)
navigationController.title = "Home"
navigationController.tabBarItem.image = UIImage(named: "icon")
viewControllers = [homeController]
}
}
HomeController:
class HomeController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.tabBarController?.tabBar.isHidden = false
}
}
EDIT:
I removed not crucial parts of the code, like isLoggedIn() function call, mentioned in the comments and changed MainNavigationController to TabBarController.
According to Matts answer I also changed this line in a TabBarController (but still bar item is not showing for some reason):
viewControllers = [navigationController]

Answer 1

The problem is this line:
viewControllers = [homeController]
homeController is not navigationController. So what happened to navigationController? Nothing. It vanished in a puff of smoke. You created navigationController but then you threw it away.
So nothing you say about navigationController and its configuration (including its tab bar item) has any effect; it is not in the interface (or anywhere else).
This is my complete test code (based on your code):
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
window?.makeKeyAndVisible()
window?.rootViewController = MainNavigationController()
return true
}
}
class MainNavigationController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
let homeController = HomeController()
let navigationController = UINavigationController(rootViewController: homeController)
navigationController.tabBarItem.title = "MyCoolTitle"
viewControllers = [navigationController] // not [homeController]
}
}
class HomeController: UIViewController {
}