如何删除 iOS 13 中出现的导航栏背景？

Question

I am tried to remove the navigation bar background in iOS 13 in the if's statements with #available. I know the original code to remove the navigation bar background for iOS 12 and older iOS in the else's statements. However, Apple did announce a new system called Appearance in anywhere to support that new iOS 13 system.

    let app = UINavigationBarAppearance()

    let navigationBar = self.navigationController?.navigationBar

    app.configureWithOpaqueBackground()
    app.shadowImage = UIImage()


    self.navigationController?.navigationBar.scrollEdgeAppearance = app

    navigationBar!.standardAppearance = app
    navigationBar!.scrollEdgeAppearance = app

I believe this configureWithOpaqueBackground() allows us to remove the navigation bar background, But I test on iOS 13.1 simulator appear black navigation bar background. I know what caused it.

     app.configureWithOpaqueBackground()
     app.titleTextAttributes = [.foregroundColor: UIColor.white]
     app.largeTitleTextAttributes = [.foregroundColor: UIColor.white]
     app.backgroundColor = #colorLiteral(red: 0.1603881121, green: 0.1677560508, blue: 0.2133775949, alpha: 1)

That code allows us to put the custom color on the black background. I ready to add that code in the viewWillDisappear's statements to restore the navigation bar background to normal color background before self.navigationController?.navigationBar.scrollEdgeAppearance = app with remove app.configureWithOpaqueBackground() and app.shadowImage = UIImage() . Now, I need to create the translucent navigation bar background in the viewWillAppear's statements, but it can't see any translucent background due to the black background still display.

I really appreciate your help in resolving the problem: :)

Answer 1

If you want the navigation bar to become completely transparent:

    let app = UINavigationBarAppearance()
    app.configureWithTransparentBackground()
    self.navigationController?.navigationBar.standardAppearance = app
    self.navigationController?.navigationBar.scrollEdgeAppearance = app
    self.navigationController?.navigationBar.compactAppearance = app

Do not mess with the isTranslucent of the navigation bar.