SwiftUI的MacOS (不是催化剂)-如何添加按钮到导航栏？

struct NavigationBarButton: View {
    var body: some View {
        Button(action: {
            // 按钮点击事件处理逻辑
        }) {
            Image(systemName: "plus") // 按钮图标
        }
    }
}

struct ContentView: View {
    var body: some View {
        NavigationView {
            Text("Hello, World!") // 应用的内容视图
                .navigationTitle("My App") // 设置导航栏标题
                .toolbar {
                    ToolbarItem(placement: .navigation) {
                        NavigationBarButton() // 添加导航栏按钮
                    }
                }
        }
    }
}

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    if let windowScene = scene as? UIWindowScene {
        let window = UIWindow(windowScene: windowScene)
        window.rootViewController = UIHostingController(rootView: ContentView())
        self.window = window
        window.makeKeyAndVisible()
    }
}