Im trying to make a picker style like the appearance picker in settings

[Ash]

Ash Asks: Im trying to make a picker style like the appearance picker in settings
I'm tying to make a picker style that looks like this

Here is the code for the theme

@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)
        }
    }

I just don't know where to start to create this as I'm a beginner to swift.

I think it would be best to make a picker style which I don't know how to do but anything to create this would work

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