Ios SwiftUI 更新导航栏标题 colored颜色

要在全局做到这一点，使用.appearance()是not所必需的.

尽管SwiftUI不直接公开导航样式，但您可以使用UIViewControllerRepresentable解决这个问题.由于SwiftUI在幕后使用常规UINavigationController，因此view controller仍将具有有效的.navigationController属性.

struct NavigationConfigurator: UIViewControllerRepresentable {
    var configure: (UINavigationController) -> Void = { _ in }

    func makeUIViewController(context: UIViewControllerRepresentableContext<NavigationConfigurator>) -> UIViewController {
        UIViewController()
    }
    func updateUIViewController(_ uiViewController: UIViewController, context: UIViewControllerRepresentableContext<NavigationConfigurator>) {
        if let nc = uiViewController.navigationController {
            self.configure(nc)
        }
    }

}

并使用它

struct ContentView: View {
    var body: some View {
        NavigationView {
            ScrollView {
                Text("Don't use .appearance()!")
            }
            .navigationBarTitle("Try it!", displayMode: .inline)
            .background(NavigationConfigurator { nc in
                nc.navigationBar.barTintColor = .blue
                nc.navigationBar.titleTextAttributes = [.foregroundColor : UIColor.white]
            })
        }
    .navigationViewStyle(StackNavigationViewStyle())
    }
}

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