如何在SwiftUI中为macOS创建首选项样式工具栏？

import SwiftUI

struct ContentView: View {
    @State private var darkModeEnabled = false

    var body: some View {
        NavigationView {
            Text("Main Content")
                .navigationTitle("App Title")
        }
        .toolbar {
            ToolbarItem(placement: .primaryAction) {
                Button(action: toggleDarkMode) {
                    Image(systemName: darkModeEnabled ? "sun.max.fill" : "moon.fill")
                }
            }
        }
    }

    func toggleDarkMode() {
        darkModeEnabled.toggle()
        NSApp.appearance = darkModeEnabled ? NSAppearance(named: .darkAqua) : NSAppearance(named: .aqua)
    }
}

@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}