我们有时可能会需要改变navigationBar的背景颜色。

• 通过appearance改变

UINavigationBar.appearance().backgroundColor = UIColor(red: 64/225, green: 161/225, blue: 64/225, alpha: 1)

• 通过NavigationConfigurator改变

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)
        }
    }
}

struct SampleView: View {
    var body: some View {
        NavigationView {
            ZStack {
                Text(/*@START_MENU_TOKEN@*/"Hello, World!"/*@END_MENU_TOKEN@*/)
            }.navigationBarItems(
                leading:

                Button(action: /*@START_MENU_TOKEN@*/ { }/*@END_MENU_TOKEN@*/) {
                    HStack {
                        Image(systemName: "arrow.left")
                        Text("back")
                    }.foregroundColor(broadCastViewHeaderFontColor)

                },
                trailing:
                    Button(action: /*@START_MENU_TOKEN@*/ { }/*@END_MENU_TOKEN@*/) {
                        Text("next").foregroundColor(broadCastViewHeaderFontColor)

                }

                ).navigationBarTitle("title", displayMode: .inline).background(NavigationConfigurator { nc in
                    nc.navigationBar.backgroundColor =  UIColor(red: 64/225, green: 161/225, blue: 64/225, alpha: 1)
                })

        }.navigationViewStyle(StackNavigationViewStyle())

    }

}

• iOS14 new toolbar

NavigationView {
    Text("My View!")
        .navigationBarTitleDisplayMode(.inline)
        .toolbar {
            ToolbarItem(placement: .principal) {
                HStack {
                    Image(systemName: "sun.min.fill")
                    Text("Title")
                        .font(.headline)
                        .foregroundColor(.orange)
                }
            }
        }
}