NavigationBar title just changes once (not white again then going back) - ios

Question

I created a new project. I have a NavigationController. In the RootViewController I have a containerView with a table and just one cell. If I click on the cell I push a new UIViewController. So my Main.storyboard looks like this:
What I want:
I want first to have a white NavigationBartitle. Then pushing to secondVC I want to change the NavigationBarTitle to black. Then clicking on back the color should change back to a white title.
What I've did:
I did a custom NavigationViewController. There I was changing the func willShow viewController. In this I wrote the titleColor should change depending on which screen the navigationController changes to.
My code:
import UIKit
class SettingsNavigationViewController: UINavigationController {}
// MARK: - Controller Lifecycle
extension SettingsNavigationViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
}
override var preferredStatusBarStyle: UIStatusBarStyle {
guard let child = self.childViewControllers.last else {
return .lightContent
}
return child is ViewController ? .lightContent : .default
}
}
// MARK: - NavigationController Delegate Implementation
extension SettingsNavigationViewController: UINavigationControllerDelegate {
func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
let isSettingsContainer = viewController is ViewController
let backgroundColor = isSettingsContainer ? UIColor.cyan : UIColor.white
let titleColor = isSettingsContainer ? UIColor.white : UIColor.black
let image = isSettingsContainer ? UIImage() : nil
navigationController.navigationBar.shadowImage = image
navigationController.navigationBar.setBackgroundImage(image, for: .default)
navigationController.transitionCoordinator?.animate(alongsideTransition: { (context) in
navigationController.navigationBar.tintColor = titleColor
navigationController.navigationBar.barTintColor = backgroundColor
navigationController.navigationBar.titleTextAttributes = [NSAttributedStringKey.foregroundColor : titleColor]
})
}
}
What happened instead:
If I change the screen to seconndVC the navBarTitleColor changes black. If I click on back it stays black. But it should change to white.
The complete project I also uploaded to github: https://github.com/Sonius94/stackNaviTitle

Answer 1

The possible solution could be, add a SecondViewController and in your SecondViewController you should implement the following :
override func willMove(toParentViewController parent: UIViewController?) {
super.willMove(toParentViewController: parent)
if parent == nil {
// Add your navigation bar appearance for FirstViewController
}
}