UINavigationBar has a wide space on top of it - ios

Question

I honestly don't know how to fix this. I currently have a UITabBar and have implemented navigationBar and when I render my app in a simulator or a device there's a wide space on top of the navigation bar. How do I get rid of this unwanted space
class DashboardTabBarView: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .blue
let dashboard = UINavigationController(rootViewController: DashboardView())
dashboard.tabBarItem.image = UIImage(systemName: "house")
dashboard.title = "Home"
tabBar.tintColor = .systemPink
setViewControllers([dashboard], animated: true)
}
}
class DashboardView: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .green
configureNavBar()
}
private func configureNavBar(){
var image = UIImage(named: "Bell")
image = image?.withRenderingMode(.alwaysOriginal)
navigationItem.leftBarButtonItem = UIBarButtonItem(image: image, style: .done, target: self, action: nil)
let item = UIBarButtonItem(title: "Sign In", style: .plain, target: self, action: #selector(self.goToSignIn))
let font:UIFont = UIFont(name: String.circularStdBold, size: 14) ?? UIFont()
item.setTitleTextAttributes([NSAttributedString.Key.font: font], for: UIControl.State.normal)
item.tintColor = .red
navigationItem.rightBarButtonItem = item
navigationController?.navigationBar.backgroundColor = UIColor(red: 0.985, green: 0.94, blue: 1, alpha: 1)[Navbar has a white space on top][1]
}
}
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
guard let windowScence = (scene as? UIWindowScene) else { return }
let navigationController = UINavigationController(rootViewController: DashboardTabBarView())
window = UIWindow(frame: windowScence.coordinateSpace.bounds)
window?.windowScene = windowScence
window?.rootViewController = navigationController
window?.makeKeyAndVisible()
}
screenshot taken from my simulator

Answer 1

The issue is that you are putting the tab bar controller in its own nav controller. Never do that. It's fine for each tab's view controller to be in its own nav controller but the tab bar controller itself should never be in a nav controller.
Change:
guard let windowScence = (scene as? UIWindowScene) else { return }
let navigationController = UINavigationController(rootViewController: DashboardTabBarView())
window = UIWindow(frame: windowScence.coordinateSpace.bounds)
window?.windowScene = windowScence
window?.rootViewController = navigationController
to:
guard let windowScence = (scene as? UIWindowScene) else { return }
window = UIWindow(frame: windowScence.coordinateSpace.bounds)
window?.windowScene = windowScence
window?.rootViewController = DashboardTabBarView()
This should eliminate the big gap at the top which was being caused by the nav bar of the window's root view controller.