c# - 如何将 ListView 页脚设置为 IsVisible=false

Question

这是页脚的 XAML 代码:

  <ListView.FooterTemplate IsVisible="{Binding IsLoading}">
    <DataTemplate>
      <StackLayout Padding="8">
        <Label Text ="Loading ..." 
               HorizontalOptions="CenterAndExpand"
               VerticalOptions="CenterAndExpand"/>
        <ActivityIndicator IsRunning="{Binding IsLoading}"                                                   
                Color="Blue" 
                HorizontalOptions="CenterAndExpand"
               VerticalOptions="CenterAndExpand"/>
      </StackLayout>
    </DataTemplate>        
  </ListView.FooterTemplate>

ActivityIndi​​cator 按预期工作(当 IsLoading 设置为 false 时停止)。但是我想让整个页脚在 IsLoading 设置为 false 后消失，但我无法做到这一点。

Answer 1

您必须为 Footer 设置 BindingContext 并将 IsVisible 更改为 StackLayout:

<ListView Footer="{Binding IsLoading}">     
    <ListView.FooterTemplate >
        <DataTemplate>
            <StackLayout IsVisible="{Binding .}" Padding="8">
                <Label Text="Loading ..." HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand" />
                <ActivityIndicator IsRunning="{Binding .}" Color="Blue" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand" />
            </StackLayout>
        </DataTemplate>
    </ListView.FooterTemplate>
</ListView>