Status bar style not changing in iOS 15

Question

I want to change status bar style based on the screen content. For darker screens, status bar content should be white. For lighter screens, status bar content should be black.

It seems that the problem only occurs in iOS 15 devices.

Below screenshot compares the same use case on both iOS 15.2 & iOS 14.5

As you can see, status bar style is defaulted even though navigation bar style is set to "black"

class ViewAController: UIViewController {
 
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // setup views ...
    }
    
     // setting navigation bar style doesn't work iOS 15. Needed to set UINavigationAppearance()
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationController?.navigationBar.barTintColor = .white
        self.navigationController?.navigationBar.barStyle = .default
        self.navigationController?.navigationBar.titleTextAttributes = [.font: UIFont.boldSystemFont(ofSize: 18), .foregroundColor: UIColor.black]
        
        if #available(iOS 15, *) {
            let appearance = UINavigationBarAppearance()
            appearance.configureWithOpaqueBackground()
            appearance.backgroundColor = .white
            appearance.shadowImage = UIImage()
            appearance.shadowColor = .clear
            
            appearance.titleTextAttributes = [.font: UIFont.boldSystemFont(ofSize: 18), .foregroundColor: UIColor.black]
            
            self.navigationItem.standardAppearance = appearance
            self.navigationItem.scrollEdgeAppearance = appearance
        }
    }


    @objc private func onClick(_ sender: UIButton) {
        let vc = ViewBViewController()
        self.show(vc, sender: self)
    }
}

class ViewBViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.backgroundColor = .white
        
        self.navigationItem.title = "View B"
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.navigationBar.barTintColor = .black
        self.navigationController?.navigationBar.barStyle = .black
        self.navigationController?.navigationBar.titleTextAttributes = [.font: UIFont.boldSystemFont(ofSize: 18), .foregroundColor: UIColor.white]
        
        // setting navigation bar style doesn't work iOS 15. Needed to set UINavigationAppearance()
        if #available(iOS 15, *) {
            let appearance = UINavigationBarAppearance()
            appearance.configureWithOpaqueBackground()
            appearance.backgroundColor = .black
            appearance.shadowImage = UIImage()
            appearance.shadowColor = .clear
            
            appearance.titleTextAttributes = [.font: UIFont.boldSystemFont(ofSize: 18), .foregroundColor: UIColor.white]
            
            self.navigationItem.standardAppearance = appearance
            self.navigationItem.scrollEdgeAppearance = appearance
        }
        
    }
}

Answer 1

Use this function:

extension ViewBViewController {
    override var preferredStatusBarStyle: UIStatusBarStyle {
        .lightContent
    }
}