extension UINavigationController {
    override open func viewDidLoad() {
        super.viewDidLoad()
      
        let standardAppearance = UINavigationBarAppearance()
        standardAppearance.backgroundColor = .red
        
        let compactAppearance = UINavigationBarAppearance()
        compactAppearance.backgroundColor = .green
        
        let scrollEdgeAppearance = UINavigationBarAppearance()
        scrollEdgeAppearance.backgroundColor = .blue
        
        navigationBar.standardAppearance = standardAppearance
        navigationBar.compactAppearance = compactAppearance
        navigationBar.scrollEdgeAppearance = scrollEdgeAppearance
    }
}