我正在研究WP8 WinRT应用。在我的DetailPage.xaml上，我有一个包含ListView和图像的ScrollViewer。
ScrollViewer工作正常，但在我在页面之间导航时它不会自动重置。
如果我向下滚动到页面A的底部，然后导航到页面B，则滚动查看器会显示内容的底部部分，而不是从顶部开始，然后让我再次向下滚动。
这是我的详细信息页面中的XAML：
<Page x:Class="LinuxBasics.RecipeDetailPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:LinuxBasics"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:data="using:LinuxBasics.DataModel"
mc:Ignorable="d"
d:DataContext="{Binding AllGroups[1].Items[1], Source={d:DesignInstance Type=data:SampleDataSource, IsDesignTimeCreatable=True}}"
DataContext="{Binding DefaultViewModel, RelativeSource={RelativeSource Self}}">
<Page.Transitions>
<TransitionCollection>
<NavigationThemeTransition>
<NavigationThemeTransition.DefaultNavigationTransitionInfo>
<CommonNavigationTransitionInfo IsStaggeringEnabled="True" />
</NavigationThemeTransition.DefaultNavigationTransitionInfo>
</NavigationThemeTransition>
</TransitionCollection>
</Page.Transitions>
<Page.Resources>
</Page.Resources>
<!--<Page.BottomAppBar>
<CommandBar>
<AppBarButton x:Name="btnPinToStart" Icon="Pin" Click="btnPinToStart_Click" Label="Like"/>
<AppBarButton x:Name="btnReminderTimer" Icon="Clock" Label="timer" Click="btnReminderTimer_Click"/>
<AppBarButton x:Name="btnBrag" Icon="Camera" Label="brag">
<AppBarButton.Flyout>
<MenuFlyout>
<MenuFlyoutItem x:Name="menuPhoto" Text="Photo" Click="menuPhoto_Click"/>
<MenuFlyoutSeparator/>
<MenuFlyoutItem x:Name="menuVideo" Text="Video" Click="menuVideo_Click"/>
</MenuFlyout>
</AppBarButton.Flyout>
</AppBarButton>
</CommandBar>
</Page.BottomAppBar>-->
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
x:Name="LayoutRoot3"
CommonNavigationTransitionInfo.IsStaggerElement="True"
DataContext="{Binding Item}"
d:DataContext="{Binding}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<StackPanel x:Name="TitlePanel"
Grid.Row="0"
Margin="20,12,0,28">
<TextBlock x:Name="AppTiltle"
Text="LINUX BASICS"
Style="{ThemeResource TitleTextBlockStyle}"
Typography.Capitals="SmallCaps" />
<TextBlock x:Name="AppCommand"
d:DataContext="{Binding}"
Text="{Binding Title}"
Margin="0,12,0,0"
TextWrapping="Wrap"
Style="{ThemeResource HeaderTextBlockStyle}" />
</StackPanel>
<Grid x:Name="RecipePanel"
Grid.Row="1">
</Grid>
<ScrollViewer Grid.Row="1"
Margin="0,10">
<StackPanel>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ListView ItemsSource="{Binding Ingredients}"
x:Uid="RecipeIngredientsPivotItem"
Grid.Row="0"
Margin="20,12,10,10">
<ListView.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Mode=OneWay}"
Style="{ThemeResource BodyTextBlockStyle}" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Image Source="{Binding ImagePath}"
Stretch="UniformToFill"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Margin="20,20,10,20"
Grid.Row="1"/>
</Grid>
</StackPanel>
</ScrollViewer>
</Grid>
这是背后的代码：
public sealed partial class RecipeDetailPage : Page
{
private NavigationHelper navigationHelper;
private ObservableDictionary defaultViewModel = new ObservableDictionary();
/// <summary>
/// NavigationHelper is used on each page to aid in navigation and
/// process lifetime management
/// </summary>
public NavigationHelper NavigationHelper
{
get { return this.navigationHelper; }
}
/// <summary>
/// This can be changed to a strongly typed view model.
/// </summary>
public ObservableDictionary DefaultViewModel
{
get { return this.defaultViewModel; }
}
public RecipeDetailPage()
{
this.InitializeComponent();
this.NavigationCacheMode = Windows.UI.Xaml.Navigation.NavigationCacheMode.Required;
this.navigationHelper = new NavigationHelper(this);
this.navigationHelper.LoadState += navigationHelper_LoadState;
}
/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="sender">
/// The source of the event; typically <see cref="NavigationHelper"/>
/// </param>
/// <param name="e">Event data that provides both the navigation parameter passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
/// a dictionary of state preserved by this page during an earlier
/// session. The state will be null the first time a page is visited.</param>
private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
var item = await RecipeDataSource.GetItemAsync((String)e.NavigationParameter);
this.DefaultViewModel["Group"] = item.Group;
this.DefaultViewModel["Item"] = item;
//// Is recipe already pinned?
//if (SecondaryTile.Exists(item.UniqueId))
// btnPinToStart.Icon = new SymbolIcon(Symbol.UnPin);
}
#region NavigationHelper registration
/// The methods provided in this section are simply used to allow
/// NavigationHelper to respond to the page's navigation methods.
///
/// Page specific logic should be placed in event handlers for the
/// <see cref="GridCS.Common.NavigationHelper.LoadState"/>
/// and <see cref="GridCS.Common.NavigationHelper.SaveState"/>.
/// The navigation parameter is available in the LoadState method
/// in addition to page state preserved during an earlier session.
protected override void OnNavigatedTo(NavigationEventArgs e)
{
navigationHelper.OnNavigatedTo(e);
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
navigationHelper.OnNavigatedFrom(e);
}
#endregion
}
只是添加ScrollViewer在我从我正在使用的应用程序示例中删除Pivots之前工作正常。
答案 0 :(得分：0)
我明白了。
我的DetailsPage顶部的页面转换（从Pivot遗留下来）导致意外行为。
如有必要，请随时删除此帖...