C# Xamarin.form设置页第二次未工作

我使用xamarin表单创建新的移动应用程序。我必须创建两个页面登录屏幕和主屏幕。 我从你那里得到样品

但当我创建相同的页面时，我无法进入第二页。它总是停留在登录页面只

在我的android活动代码中

   public class MainActivity : AndroidActivity, LoginManager
{
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        Xamarin.Forms.Forms.Init(this, bundle);

        SetPage(App.GetLoginPage(this));
      // SetPage(App.GetLoginPage(this));


    }
    #region ILoginManager implementation
    public void ShowMainPage()
    {
        SetPage(App.GetHomePage(this));
    }

    public void Logout()
    {
        SetPage(App.GetLoginPage(this));
    }
    #endregion
}

---

第二次调用setPage方法，但未替换页面内容。请帮助任何人

以下是Android第二个设置页面问题的解决方法。创建第二个接口，而不是在现有活动上使用set page，启动一个新活动，其中OnCreate of the new activity调用set page并完成当前活动

App.cs

    public static ILoginManager LoginManager;
    public static IAppNavigation SplashManger;      


    public static Page GetLoginPage(ILoginManager lmanager)
    {
        LoginManager = lmanager;          
        return new Page_Login();
    }

    public static Page GetShowSplashPage(IAppNavigation iSplashNavigation)
    {
        SplashManger = iSplashNavigation;
        return new Page_Splash();
    }

Android MainActivity

[Activity(Label = "", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize |   ConfigChanges.Orientation)]
public class MainActivity : AndroidActivity, IAppNavigation
{
    protected override void OnCreate(Bundle bundle)
    {
        //Window.RequestFeature(WindowFeatures.NoTitle);
        base.OnCreate(bundle);

        Xamarin.Forms.Forms.Init(this, bundle);
        SetPage(App.GetShowSplashPage(this));
    }



    public void GetLoginPage()
    {
        StartActivity(new Intent(this, typeof(LoginActivity)));
        Finish();
    }

[Activity(Label = "", ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class LoginActivity : AndroidActivity, ILoginManager
{
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        Xamarin.Forms.Forms.Init(this, bundle);
        SetPage(App.GetLoginPage(this));
    }



    public void GetMainMenu()
    {
        StartActivity(new Intent(this, typeof(MainMenuActivity)));
        Finish();
    }

Android LoginActivity

[Activity(Label = "", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize |   ConfigChanges.Orientation)]
public class MainActivity : AndroidActivity, IAppNavigation
{
    protected override void OnCreate(Bundle bundle)
    {
        //Window.RequestFeature(WindowFeatures.NoTitle);
        base.OnCreate(bundle);

        Xamarin.Forms.Forms.Init(this, bundle);
        SetPage(App.GetShowSplashPage(this));
    }



    public void GetLoginPage()
    {
        StartActivity(new Intent(this, typeof(LoginActivity)));
        Finish();
    }

[Activity(Label = "", ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
public class LoginActivity : AndroidActivity, ILoginManager
{
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        Xamarin.Forms.Forms.Init(this, bundle);
        SetPage(App.GetLoginPage(this));
    }



    public void GetMainMenu()
    {
        StartActivity(new Intent(this, typeof(MainMenuActivity)));
        Finish();
    }

在iOS中，您不需要做任何特殊的事情，只需实现所有必要的接口，就可以在AppDelegate中使用

iOS AppDelegate

[Register("AppDelegate")]
public partial class AppDelegate : UIApplicationDelegate, ILoginManager, IAppNavigation
{
    // class-level declarations
    UIWindow window;


    public override bool FinishedLaunching(UIApplication app, NSDictionary options)
    {
        Forms.Init();

        window = new UIWindow(UIScreen.MainScreen.Bounds);

        window.RootViewController = App.GetShowSplashPage(this).CreateViewController();

        window.MakeKeyAndVisible();

        return true;
    }

    public void GetMainMenu()
    {
        window.RootViewController = App.GetMainMenu().CreateViewController();
        window.MakeKeyAndVisible();
    }

    public void GetLoginPage()
    {
        window.RootViewController = App.GetLoginPage(this).CreateViewController();
        window.MakeKeyAndVisible();
    }

---

Forms框架为您处理导航。您应该使用Xamarin.Forms.Navigation类来管理导航堆栈，并避免在Android项目中使用SetPage，