statusBarStyle

extension UINavigationController {
    override open var childForStatusBarStyle: UIViewController? {
        return topViewController
    }
}

extension UITabBarController {
    override open var childForStatusBarStyle: UIViewController? {
        return selectedViewController
    }
}

extension UISplitViewController {
    override open var childForStatusBarStyle: UIViewController? {
        return viewControllers.first
    }
}