Xamarin.Forms 如何禁用 ListView 上的单击动画
[英]Xamarin.Forms How do I disable click animation on ListView
问题描述
我目前正在开发一个使用 ListView 的应用程序。 这个应用程序是用 Xamarin.Forms 创建的，最初是为了在 Android 和 iOS 上使用。 但是，我们也决定准备一个 UWP 项目。
问题是，当单击列表视图中的项目时，UWP 应用程序中发生了单击动画：
看看这张图片我所说的动画是什么意思：示例 UWP 单击动画
但是这个动画在我们的项目中看起来不太好。
问题是：如何禁用列表视图项上的单击动画？ 我们只想成为一个没有任何动画的列表视图。 只是一个简单的平面列表，同时保留 eventHandlers。
在另一个 Stackoverflow 论坛中，他们告诉我们禁用控件。 但这使控件完全无用，因为我们无法获得 selecteditem + 它禁用滚动。
我还发现了这个有用的论坛，但是此说明适用于 UAP（Win8 应用程序）： https : //nicksnettravels.builttoroam.com/post/2014/05/25/Remove-TapMouse-Down-Animations-on-GridView-and- ListView-for-Windows-81.aspx
有人可以分享如何禁用动画的示例或示例代码吗？
3 个解决方案
解决方案1
0 2018-06-03 18:05:08
我认为您可以通过使用自定义渲染器来实现这一点。 然而，另一种选择是利用包“ FlowListView ”，其中有一个名为FlowTappedBackgroundColor的属性，您可以通过它在点击时设置单元格的背景颜色，在您的情况下为“透明”。
解决方案2
0 2018-07-23 07:57:43
使用自定义渲染器。 如果你去 UWP 的项目部分并且你使用 Control 作为 Windows.UI.Xaml.Controls.ListView 有一个属性 IsItemClickEnabled
解决方案3
0 2020-02-18 12:04:24
您需要创建一个自定义列表视图渲染器并在其上应用自定义样式。
创建一个派生的 ListView：
namespace MyApp.Controls
{
public class MyListView : Xamarin.Forms.ListView
{
}
}
在您的视图中，将 ListView 更改为您的派生控件：
<?xml version="1.0" encoding="utf-8" ?>
<ContentView
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:controls="clr-namespace:MyApp.Controls"
x:Class="MyApp.MyView">
<controls:MyListView
ItemsSource="{Binding ListSource}"
SelectionMode="None"
SeparatorVisibility="None">
// ...
// template
// ..
</controls:CustomListView>
</ContentView>
在你的 UWP 项目中创建一个列表视图渲染：
[assembly: ExportRenderer(typeof(MyListView), typeof(MyListViewRenderer))]
namespace MyApp
{
class MyListViewRenderer : ListViewRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
{
base.OnElementChanged(e);
if (Control is Windows.UI.Xaml.Controls.ListView listView)
{
listView.ItemContainerStyle = (Windows.UI.Xaml.Style)MyApp.App.Current.Resources["CustomListViewItem"];
}
}
}
}
现在您需要定义上面的 CustomListViewItem 样式。 windows 控件的默认样式在 generic.xaml 文件中定义，可以在以下本地路径中找到：
C:\Program Files (x86)\Windows Kits\10\DesignTime\CommonConfiguration\Neutral\UAP\10.0.18362.0\Generic
在其中，您会找到默认的列表视图项样式，称为 ListViewItemExpanded，您需要修改其样式并将其加载到资源字典中。 这是一个没有动画的缩短版本（将其保存到 CustomListViewItem.xaml）：
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
<Style x:Key="CustomListViewItem" TargetType="ListViewItem">
<Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}" />
<Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}" />
<Setter Property="BorderBrush" Value="{x:Null}" />
<Setter Property="BorderThickness" Value="0" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseHighBrush}" />
<Setter Property="TabNavigation" Value="Local" />
<Setter Property="IsHoldingEnabled" Value="True" />
<Setter Property="Padding" Value="0,0,0,0" />
<Setter Property="HorizontalContentAlignment" Value="Left" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="MinWidth" Value="{ThemeResource ListViewItemMinWidth}" />
<Setter Property="MinHeight" Value="{ThemeResource ListViewItemMinHeight}" />
<Setter Property="AllowDrop" Value="False" />
<Setter Property="UseSystemFocusVisuals" Value="{StaticResource UseSystemFocusVisuals}" />
<Setter Property="FocusVisualMargin" Value="0" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListViewItem">
<Grid x:Name="ContentBorder"
Control.IsTemplateFocusTarget="True"
FocusVisualMargin="{TemplateBinding FocusVisualMargin}"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
CornerRadius="{TemplateBinding CornerRadius}"
RenderTransformOrigin="0.5,0.5">
<Grid.RenderTransform>
<ScaleTransform x:Name="ContentBorderScale" />
</Grid.RenderTransform>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal">
<Storyboard>
<PointerUpThemeAnimation Storyboard.TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
<VisualState x:Name="PointerOver">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerUpThemeAnimation Storyboard.TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListMediumBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<!--<PointerDownThemeAnimation TargetName="ContentPresenter" />-->
</Storyboard>
</VisualState>
<VisualState x:Name="Selected">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="MultiSelectCheck"
Storyboard.TargetProperty="Opacity"
Duration="0:0:0"
To="1" />
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerUpThemeAnimation Storyboard.TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
<VisualState x:Name="PointerOverSelected">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="MultiSelectCheck"
Storyboard.TargetProperty="Opacity"
Duration="0:0:0"
To="1" />
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentMediumBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerUpThemeAnimation Storyboard.TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
<VisualState x:Name="PressedSelected">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="MultiSelectCheck"
Storyboard.TargetProperty="Opacity"
Duration="0:0:0"
To="1" />
<DoubleAnimation Storyboard.TargetName="BorderBackground"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="1" />
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderBackground" Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
<PointerDownThemeAnimation TargetName="ContentPresenter" />
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="DisabledStates">
<VisualState x:Name="Enabled" />
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="ContentBorder"
Storyboard.TargetProperty="Opacity"
Duration="0"
To="{ThemeResource ListViewItemDisabledThemeOpacity}" />
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="MultiSelectStates">
<VisualState x:Name="MultiSelectDisabled">
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheckBoxTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="0" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="-32" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectClipTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="0" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="32" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenterTranslateTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="32" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="0" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible" />
<DiscreteObjectKeyFrame KeyTime="0:0:0.333" Value="Collapsed" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="MultiSelectEnabled">
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheckBoxTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="-32" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="0" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectClipTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="32" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="0" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenterTranslateTransform" Storyboard.TargetProperty="X">
<EasingDoubleKeyFrame KeyTime="0:0:0" Value="-32" />
<SplineDoubleKeyFrame KeyTime="0:0:0.333" Value="0" KeySpline="0.1,0.9,0.2,1" />
</DoubleAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectSquare" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="MultiSelectCheck" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0" Value="Visible" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenterGrid" Storyboard.TargetProperty="Margin">
<DiscreteObjectKeyFrame KeyTime="0" Value="32,0,0,0" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Rectangle x:Name="BorderBackground"
IsHitTestVisible="False"
Fill="{ThemeResource SystemControlHighlightListAccentLowBrush}"
Opacity="0"
Control.IsTemplateFocusTarget="True" />
<Grid x:Name="ContentPresenterGrid" Background="Transparent" Margin="0,0,0,0">
<Grid.RenderTransform>
<TranslateTransform x:Name="ContentPresenterTranslateTransform" />
</Grid.RenderTransform>
<ContentPresenter x:Name="ContentPresenter"
ContentTransitions="{TemplateBinding ContentTransitions}"
ContentTemplate="{TemplateBinding ContentTemplate}"
Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
Margin="{TemplateBinding Padding}" />
</Grid>
<!-- The 'Xg' text simulates the amount of space one line of text will occupy.
In the DataPlaceholder state, the Content is not loaded yet so we
approximate the size of the item using placeholder text. -->
<TextBlock x:Name="PlaceholderTextBlock"
Opacity="0"
Text="Xg"
Foreground="{x:Null}"
Margin="{TemplateBinding Padding}"
IsHitTestVisible="False"
AutomationProperties.AccessibilityView="Raw" />
<Rectangle x:Name="PlaceholderRect" Visibility="Collapsed" Fill="{ThemeResource ListViewItemPlaceholderBackground}" />
<Border x:Name="MultiSelectSquare"
BorderBrush="{ThemeResource SystemControlForegroundBaseMediumHighBrush}"
BorderThickness="2"
Width="20"
Height="20"
Margin="12,0,0,0"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Visibility="Collapsed">
<Border.Clip>
<RectangleGeometry Rect="0,0,20,20">
<RectangleGeometry.Transform>
<TranslateTransform x:Name="MultiSelectClipTransform" />
</RectangleGeometry.Transform>
</RectangleGeometry>
</Border.Clip>
<Border.RenderTransform>
<TranslateTransform x:Name="MultiSelectCheckBoxTransform" />
</Border.RenderTransform>
<FontIcon x:Name="MultiSelectCheck"
FontFamily="{ThemeResource SymbolThemeFontFamily}"
Glyph=""
FontSize="16"
Foreground="{ThemeResource SystemControlForegroundBaseMediumHighBrush}"
Visibility="Collapsed"
Opacity="0" />
</Border>
<Border x:Name="MultiArrangeOverlayTextBorder"
Opacity="0"
IsHitTestVisible="False"
Margin="12,0,0,0"
MinWidth="20"
Height="20"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Background="{ThemeResource SystemControlBackgroundAccentBrush}"
BorderThickness="2"
BorderBrush="{ThemeResource SystemControlBackgroundChromeWhiteBrush}">
<TextBlock x:Name="MultiArrangeOverlayText"
Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=TemplateSettings.DragItemsCount}"
Style="{ThemeResource CaptionTextBlockStyle}"
IsHitTestVisible="False"
Opacity="0"
VerticalAlignment="Center"
HorizontalAlignment="Center"
AutomationProperties.AccessibilityView="Raw" />
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
请注意， <PointerDownThemeAnimation TargetName="ContentPresenter" />在按下的视觉状态下被注释掉了。
现在将该资源加载到您的应用程序：
<Application
x:Class="MyApp.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Styles/CustomListViewItem.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
您可能需要进一步调整样式，但基本上就是这样。
顺便说一句，同样的方法可用于调整 UWP 中任何本机控件的外观。
Xamarin.Forms如何禁用列表视图上的悬停突出显示效果
[英]Xamarin.Forms How can I disable hover highlight effect on listview
如何在Xamarin.Forms中访问listview datatemplate内的按钮？
[英]How to access button click inside listview datatemplate in Xamarin.Forms?
如何使用 MVVM 和 Xamarin.Forms ListView ItemSelected 事件来检索所选项目的绑定属性？
[英]How do I use MVVM and Xamarin.Forms ListView ItemSelected event to to retrieve a bound property of the item selected?
如何通过打开上下文操作菜单从ListView中获取所选项目？ （Xamarin.Forms）
[英]How do I get the selected item from a ListView by opening the context actions menu? (Xamarin.Forms)
如何使用 XAML 在 Xamarin.Forms 的 ListView 中选择一个项目
[英]How can I select an item in a ListView in Xamarin.Forms with XAML
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.
相关问题
Xamarin.Forms - 如何制作点击计数器？
Xamarin.Forms如何禁用列表视图上的悬停突出显示效果
如何在Xamarin.Forms中访问listview datatemplate内的按钮？
Xamarin.forms ListView单击到下一页
如何使用 MVVM 和 Xamarin.Forms ListView ItemSelected 事件来检索所选项目的绑定属性？
如何通过打开上下文操作菜单从ListView中获取所选项目？ （Xamarin.Forms）
如何使用 XAML 在 Xamarin.Forms 的 ListView 中选择一个项目
Xamarin.forms动画
Xamarin Forms 禁用 ListView 加载动画
如何在 xamarin.forms 中获取 ListView 的子项？
相关标签