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Microsoft が提供するガイドに従って拡張スプラッシュ スクリーンを作成しました。画面が表示されず、データが読み込まれますが、アプリはランディング ページに移動しません。これはどのように可能ですか？

ExtendedSplash.xaml.cs

public sealed partial class ExtendedSplash
{

    public ExtendedSplash(SplashScreen splash)
    {
        this.InitializeComponent();

        // Position the extended splash screen image in the same location as the splash screen image.
        this.extendedSplashImage.SetValue(Canvas.LeftProperty, splash.ImageLocation.X);
        this.extendedSplashImage.SetValue(Canvas.TopProperty, splash.ImageLocation.Y);
        this.extendedSplashImage.Height = splash.ImageLocation.Height;
        this.extendedSplashImage.Width = splash.ImageLocation.Width;

        // Position the extended splash screen's progress ring.
        this.ProgressRing.SetValue(Canvas.TopProperty, splash.ImageLocation.Y + splash.ImageLocation.Height + 32);
        this.ProgressRing.SetValue(Canvas.LeftProperty,
     splash.ImageLocation.X +
             (splash.ImageLocation.Width / 2) - 15);
    }

    public void onSplashScreenDismissed(SplashScreen sender, object args)
    {

    }
}

App.xaml.cs から

    protected override async void OnLaunched(LaunchActivatedEventArgs args)
    {
        _newsDataSource = (NewsDataSource)App.Current.Resources["newsDataSource"];
        _movieDataSource = (MovieDataSource)App.Current.Resources["moviesDataSource"];
        await PerformDataFetch();

        // extended splash screen loading
        ExtendedSplash eSplash = new ExtendedSplash(args.SplashScreen);
        args.SplashScreen.Dismissed +=
            new TypedEventHandler<SplashScreen, object>(eSplash.onSplashScreenDismissed);

        // Place the frame in the current Window
        Window.Current.Content = eSplash;
        Window.Current.Activate();
    }

    internal async Task PerformDataFetch()
    {
        // load news
        if (_newsDataSource != null)
        {
            if (!_newsDataSource.News.Any())
            {
                await _newsDataSource.GetNewsAsync();
            }
        }

        // load movies
        if (_movieDataSource != null)
        {
            if (!_movieDataSource.Movies.Any())
            {
                await _movieDataSource.GetMoviesAsync();
            }
        }

        RemoveExtendedSplash();
    }

    internal void RemoveExtendedSplash()
    {
        Window.Current.Content = new MainPage();
        Window.Current.Activate();
    }

最後のメソッドにブレークポイントを設定すると、メソッドが起動しますが、ページへの遷移はありません。私は ProgressRing のアニメーションが好きですが、アプリは何か他のこともすべきです :)

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1 に答える 1

3

ExtendedSplash must be a Page. So ExtendedSplash.xaml.cs:

public sealed partial class ExtendedSplash : Page
{
    public ExtendedSplash()
    {
        this.InitializeComponent();
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        SplashScreen splash = (SplashScreen) e.Parameter;

        // Position the extended splash screen image in the same location as the splash screen image.
        this.extendedSplashImage.SetValue(Canvas.LeftProperty, splash.ImageLocation.X);
        this.extendedSplashImage.SetValue(Canvas.TopProperty, splash.ImageLocation.Y);
        this.extendedSplashImage.Height = splash.ImageLocation.Height;
        this.extendedSplashImage.Width = splash.ImageLocation.Width;

        // Position the extended splash screen's progress ring.
        this.ProgressRing.SetValue(Canvas.TopProperty, splash.ImageLocation.Y + splash.ImageLocation.Height + 32);
        this.ProgressRing.SetValue(Canvas.LeftProperty,
     splash.ImageLocation.X +
             (splash.ImageLocation.Width / 2) - 15);
    }
}

And all data fetch operations should be executed in App.xaml.cs. When finished, it's enough just to navigate frame to landing page.

sealed partial class App : Application
{
    private Frame _rootFrame;

    protected override async void OnLaunched(LaunchActivatedEventArgs args)
    {
        if(_rootFrame == null)
            _rootFrame = new Frame();

        // Place the frame in the current Window
        _rootFrame.Navigate(typeof (ExtendedSplash), args.SplashScreen);
        Window.Current.Content = _rootFrame;
        Window.Current.Activate();

        await PerformDataFetch();
    }

    internal async Task PerformDataFetch()
    {
        // data loading here

        RemoveExtendedSplash();
    }

    internal void RemoveExtendedSplash()
    {
        if (_rootFrame != null) _rootFrame.Navigate(typeof (MainPage));
    }
}
于 2012-09-24T11:53:37.200 に答える