如何解决如何在 UWP Visibility 中制作 PivotItemHeader 跟随 PivotItem 的可见性？
我有一个 Pivot，其中包含几个静态 PivotItems 和几个在代码后面动态生成的 Pivot。我希望能够通过更改 PivotItem 的 Visibility 属性来隐藏 PivotHeaderItems。
这是我的代码：
<Style targettype="PivotHeaderItem">
<Setter Property="FontSize" Value="{ThemeResource PivotHeaderItemFontSize}" />
<Setter Property="FontFamily" Value="{ThemeResource PivotHeaderItemFontFamily}" />
<Setter Property="FontWeight" Value="{ThemeResource PivotHeaderItemThemeFontWeight}" />
<Setter Property="CharacterSpacing" Value="{ThemeResource PivotHeaderItemCharacterSpacing}" />
<Setter Property="Background" Value="{ThemeResource SystemChromeLowColor}" />
<Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseHighBrush}" />
<Setter Property="Padding" Value="{ThemeResource PivotHeaderItemmargin}" />
<Setter Property="Height" Value="Auto" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="IsTabStop" Value="False" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate targettype="PivotHeaderItem">
<Grid x:Name="Grid" CornerRadius="4" Margin="4" Visibility="{TemplateBinding Visibility}" Background="{TemplateBinding Background}">
<Grid.Resources>
<Style x:Key="BaseContentPresenterStyle" targettype="ContentPresenter">
<Setter Property="FontFamily" Value="Segoe UI"/>
<Setter Property="FontWeight" Value="SemiBold"/>
<Setter Property="FontSize" Value="15"/>
<Setter Property="textwrapping" Value="Wrap"/>
<Setter Property="LinestackingStrategy" Value="MaxHeight"/>
<Setter Property="TextLineBounds" Value="Full"/>
<Setter Property="OpticalMarginAlignment" Value="Trimsidebearings"/>
</Style>
<Style x:Key="BodyContentPresenterStyle" targettype="ContentPresenter" BasedOn="{StaticResource BaseContentPresenterStyle}">
<Setter Property="FontFamily" Value="{ThemeResource PivotHeaderItemFontFamily}" />
<Setter Property="FontWeight" Value="{ThemeResource PivotHeaderItemThemeFontWeight}"/>
<Setter Property="FontSize" Value="{ThemeResource PivotHeaderItemFontSize}"/>
</Style>
</Grid.Resources>
<Grid.RowDeFinitions>
<RowDeFinition Height="auto"/>
<RowDeFinition Height="auto"/>
</Grid.RowDeFinitions>
<visualstatemanager.VisualStateGroups>
<VisualStateGroup x:Name="SelectionStates">
<VisualStateGroup.Transitions>
<VisualTransition From="Unselected" To="UnselectedLocked" GeneratedDuration="0:0:1.33" />
<VisualTransition From="UnselectedLocked" To="Unselected" GeneratedDuration="0:0:1.33" />
</VisualStateGroup.Transitions>
<VisualState x:Name="disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground" >
<discreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControldisabledBaseMediumLowBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Unselected" />
<VisualState x:Name="UnselectedLocked">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="ContentPresenterTranslateTransform"
Storyboard.TargetProperty="X"
Duration="0" To="{ThemeResource PivotHeaderItemlockedTranslation}" />
<DoubleAnimation Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="(UIElement.Opacity)"
Duration="0" To="0" />
</Storyboard>
</VisualState>
<VisualState x:Name="Selected">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground" >
<discreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
Storyboard.TargetProperty="Background" >
<discreteObjectKeyFrame KeyTime="0" Value="{StaticResource SystemAccentColorLight3}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Border"
Storyboard.TargetProperty="Background" >
<discreteObjectKeyFrame KeyTime="0" Value="{StaticResource SystemAccentColor}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="UnselectedPointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground" >
<discreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
Storyboard.TargetProperty="Background" >
<discreteObjectKeyFrame KeyTime="0" Value="{StaticResource SystemControlHighlightAccent3RevealBackgroundBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="SelectedPointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground" >
<discreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
Storyboard.TargetProperty="Background" >
<discreteObjectKeyFrame KeyTime="0" Value="{StaticResource SystemAccentColorLight3}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Border"
Storyboard.TargetProperty="Background" >
<discreteObjectKeyFrame KeyTime="0" Value="{StaticResource SystemAccentColor}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Unselectedpressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground" >
<discreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
Storyboard.TargetProperty="Background" >
<discreteObjectKeyFrame KeyTime="0" Value="{StaticResource SystemAccentColorLight3}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Selectedpressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground" >
<discreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
Storyboard.TargetProperty="Background" >
<discreteObjectKeyFrame KeyTime="0" Value="{StaticResource SystemAccentColorLight3}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</visualstatemanager.VisualStateGroups>
<ContentPresenter
x:Name="ContentPresenter"
Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
Padding="4 8 4 4"
Margin="{TemplateBinding Padding}"
FontSize="{TemplateBinding FontSize}"
FontFamily="{TemplateBinding FontFamily}"
FontWeight="{TemplateBinding FontWeight}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
Grid.Row="0">
<ContentPresenter.RenderTransform>
<TranslateTransform x:Name="ContentPresenterTranslateTransform" />
</ContentPresenter.RenderTransform>
</ContentPresenter>
<Border x:Name="Border" CornerRadius="0 0 4 4" Background="Transparent" Grid.Row="1" Height="4"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
这是我的 Pivot XAML 代码：
<Pivot Name="SettingsPivot">
<PivotItem Name="SubscriptionsandUpdatesPivot" Header="Subscription and Version" Visibility="Collapsed">
<StackPanel Width="auto" HorizontalAlignment="Stretch">
<StackPanel Orientation="Horizontal" HorizontalAlignment="Stretch" VerticalAlignment="Top">
<TextBlock Margin="10,10,10" Text="Premium Subscription:" />
<TextBlock x:Name="SubscriptionStatus" FontWeight="Bold" Margin="8" Text="Loading..." Custom:DockPanel.Dock="Left"/>
</StackPanel>
<Button x:Name="BuyMonthlySubscriptionButton" Margin="8" Content="Purchase Monthly Subscription" IsEnabled="False" HorizontalAlignment="Left" Custom:DockPanel.Dock="Right" Click="BuyMonthlySubscriptionButton_Click"/>
<TextBlock Margin="8" HorizontalAlignment="Left" Visibility="Collapsed" Text=" * unlocks Dashboards,Patients Finder,Sending Emails and Scheduler." />
<TextBlock Margin="8" HorizontalAlignment="Left" Text=" * in this version,all features are unlocked for testing purposes." />
<NavigationViewItemSeparator/>
<StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Orientation="Vertical">
<StackPanel Orientation="Horizontal">
<TextBlock Margin="8" Text="Current Version: " />
<TextBlock x:Name="VersionStatus" FontWeight="Bold" Margin="8" Text="Please Wait ..." />
<HyperlinkButton Name="VersionInfoPage" Content="See Version Features" HorizontalAlignment="Center" />
</StackPanel>
<Button x:Name="UpdateButton" Margin="8" Content="Update" HorizontalAlignment="Left" IsEnabled="false" Click="UpdateButton_Click"/>
<NavigationViewItemSeparator/>
<Custom:DockPanel VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Visibility="Collapsed">
<ScrollViewer BorderBrush="Gray" BorderThickness="2" CornerRadius="2">
</ScrollViewer>
</Custom:DockPanel>
</StackPanel>
</StackPanel>
</PivotItem>
</Pivot>
我尝试在主网格中设置 Visibility="{TemplateBinding Visibility}" 以生成 PivotItemHeader 但它不遵循 PivotItem's.Visibility。
这就是设计现在的样子
解决方法
您不能以这种方式更改 PivotItem 的可见性，因为“项目”仍保留在控件的项目集合中。相反，您需要将其从控件本身中删除（稍后根据需要重新添加）：
// Remove item
SettingsPivot.Items.Remove(SubscriptionsandUpdatesPivot);
// Re-add item
SettingsPivot.Items.Add(SubscriptionsandUpdatesPivot);
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