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我有UIkit一个项目，我想更改导航栏颜色和后退按钮颜色。它在以前的版本上工作正常。但在 iOS 15 中则不然。我在上面添加了以下代码AppDelegate，它更改了标题颜色但不更改后退按钮项目颜色。如何修复它？

if #available(iOS 15.0, *) {
   let appearance = UINavigationBarAppearance()
   let navigationBar = UINavigationBar()
   appearance.configureWithOpaqueBackground()
   appearance.titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
   appearance.backgroundColor = .red
   navigationBar.tintColor = .white
   navigationBar.standardAppearance = appearance;
   UINavigationBar.appearance().scrollEdgeAppearance = appearance
}else{
   let navBarAppearnce = UINavigationBar.appearance()
   navBarAppearnce.tintColor = .white
   navBarAppearnce.barTintColor = .red
   navBarAppearnce.titleTextAttributes = [NSAttributedString.Key.foregroundColor:UIColor.white]
}