Ios 我正在try 制作一种 Select 器样式，例如设置中的外观 Select 器

I'm tying to make a picker style that looks like this

以下是该主题的代码

@main
struct GreenPowerPlantUniversalApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                .modifier(DarkModeViewModifier())
        }
    }
    class AppThemeViewModel: ObservableObject {
        @AppStorage("appThemeSetting") var appThemeSetting = Appearance.system
    }
    
    struct DarkModeViewModifier: ViewModifier {
        @ObservedObject var appThemeViewModel: AppThemeViewModel = AppThemeViewModel()
        
        public func body(content: Content) -> some View {
            content
                .preferredColorScheme((appThemeViewModel.appThemeSetting == .system) ? .none : appThemeViewModel.appThemeSetting == .light ? .light : .dark)
        }
    }
    
    enum Appearance: String, CaseIterable, Identifiable  {
        case system
        case light
        case dark
        var id: String { self.rawValue }
    }
}
    struct ThemeSettingsView: View {
        @AppStorage("appThemeSetting") var appThemeSetting = GreenPowerPlantUniversalApp.Appearance.system
        
        var body: some View {
            VStack {
                    Picker("Appearance", selection: $appThemeSetting) {
                        ForEach(GreenPowerPlantUniversalApp.Appearance.allCases) { appearance in
                            Text(appearance.rawValue.capitalized)
                                .tag(appearance)
                        }
                    }
                    .pickerStyle(SegmentedPickerStyle())
            }.padding(.bottom, 100)
                .padding(.horizontal, 20)
        }
    }

我只是不知道从哪里开始创作，因为我还是个初学者 敬Swift .

我认为最好是做一个我不知道怎么做的Picker风格，但任何创造这个风格的东西都可以