Clear Navigation Bar bottom shadow, set clear color and translucent true

NavigationBar+ClearAndFont.swift

//

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        setupAppearance()
    }
    
    fileprivate func setupAppearance() {
        UINavigationBar.appearance().setBackgroundImage(UIImage(), for: UIBarMetrics.default)
        // remove shadow at the bottom
        UINavigationBar.appearance().shadowImage = UIImage()
        // set navbar to translucent
        UINavigationBar.appearance().isTranslucent = true
        // background color
        UINavigationBar.appearance().backgroundColor = .clear
        // configure font color, size and weight
        UINavigationBar.appearance().titleTextAttributes = [
            NSAttributedString.Key.foregroundColor: UIColor.black,
            NSAttributedString.Key.font: UIFont.systemFont(ofSize: 25.0, weight: .black)
        ]
        // optional: configure back button
        UINavigationBar.appearance().backIndicatorImage = UIImage(systemName: "chevron.left.2")
        UINavigationBar.appearance().backIndicatorTransitionMaskImage = UIImage(systemName: "chevron.left.2")
    }
}

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        //
        self.navigationItem.title = "Navigation Bar"
    }
}