Add and Switch Splash Screens in .NET MAUI

Normal Page Mode
In the constructor of App.xaml.cs, replace the MainPage object.

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public App()
{
    InitializeComponent();

    MainPage = new NewPage1();
}

MVVM Mode
Override the CreateWindow method in App.xaml.cs.

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protected override Window CreateWindow(IActivationState? activationState)
{
    NewPage1? desktopShellService = Handler.MauiContext!.Services.GetService<NewPage1>();
    Window window = new Window(desktopShellService)
    {
        Width = DeviceDisplay.Current.MainDisplayInfo.Width / 2,
        Height = DeviceDisplay.Current.MainDisplayInfo.Height / 2,
    };
    return window;
}

Switch from Splash Screen to Main Page
In the page’s Loaded event or other events, add code to switch the MainPage object.

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async Task Loaded()
{
    await Task.Delay(5000);
    _ = Task.Run(() =>
    {
        AppShell? desktopShellService = Application.Current.Handler.MauiContext!.Services.GetService<AppShell>();
        if (desktopShellService != null && desktopShellService != Application.Current.MainPage)
        {
            MainThread.BeginInvokeOnMainThread(() =>
            {
                Application.Current.MainPage = desktopShellService;
            });
        }
    });
    //AppShell? desktopShellService = Application.Current.Handler.MauiContext!.Services.GetService<AppShell>();
    //if (desktopShellService != null && desktopShellService != Application.Current.MainPage)
    //{
    //    Application.Current.MainPage = desktopShellService;
    //}
}