如何在Xamarin表单中设置前两页中的任意一页

// HomePage.xaml.cs
public partial class HomePage : ContentPage
{
    public HomePage()
    {
        InitializeComponent();
        // 设置按钮点击事件
        Button settingsButton = new Button { Text = "Go to Settings" };
        settingsButton.Clicked += (sender, e) => Navigation.PushAsync(new SettingsPage());
        Content = new StackLayout
        {
            Children = { settingsButton }
        };
    }
}

// SettingsPage.xaml.cs
public partial class SettingsPage : ContentPage
{
    public SettingsPage()
    {
        InitializeComponent();
        // 设置按钮点击事件
        Button homeButton = new Button { Text = "Go to Home" };
        homeButton.Clicked += (sender, e) => Navigation.PopAsync();
        Content = new StackLayout
        {
            Children = { homeButton }
        };
    }
}

// App.xaml.cs
public partial class App : Application
{
    public App()
    {
        InitializeComponent();

        MainPage = new NavigationPage(new HomePage());
    }

    protected override void OnStart()
    {
        // Handle when your app starts
    }

    protected override void OnSleep()
    {
        // Handle when your app sleeps
    }

    protected override void OnResume()
    {
        // Handle when your app resumes
    }
}