我正在尝试使用此链接中指定的 CollectionView 和 CarouselView 在 Xamarin.Forms 中创建可滚动选项卡。我需要根据在标题中选择的选项卡在 CarouselView 中加载不同的 ContentView。
我尝试如下,但 ContentView 没有显示..
下面是xaml代码:
<Grid x:DataType="{x:Null}" RowSpacing="0">
<Grid.RowDefinitions>
<RowDefinition Height="45" />
<RowDefinition Height="45" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<CollectionView
x:Name="CustomTabsView"
Grid.Row="1"
HorizontalScrollBarVisibility="Never"
ItemSizingStrategy="MeasureAllItems"
ItemsSource="{Binding TabVms}"
ItemsUpdatingScrollMode="KeepItemsInView"
SelectedItem="{Binding CurrentTabVm, Mode=TwoWay}"
SelectionMode="Single"
VerticalScrollBarVisibility="Never">
<CollectionView.ItemsLayout>
<LinearItemsLayout Orientation="Horizontal" />
</CollectionView.ItemsLayout>
<CollectionView.ItemTemplate>
<DataTemplate x:DataType="local:TabViewModel">
<Grid RowSpacing="0">
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="3" />
</Grid.RowDefinitions>
<Label
x:Name="TitleLabel"
Grid.Row="0"
Padding="15,0"
FontAttributes="Bold"
FontSize="Small"
HeightRequest="50"
HorizontalTextAlignment="Center"
Text="{Binding Title}"
TextColor="White"
VerticalTextAlignment="Center" />
<BoxView
x:Name="ActiveIndicator"
Grid.Row="1"
BackgroundColor="Red"
IsVisible="{Binding IsSelected, Mode=TwoWay}" />
</Grid>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
<CarouselView
Grid.Row="2"
CurrentItem="{Binding CurrentTabVm, Mode=TwoWay}"
CurrentItemChanged="CarouselView_CurrentItemChanged"
HorizontalScrollBarVisibility="Never"
IsScrollAnimated="True"
IsSwipeEnabled="True"
ItemsSource="{Binding TabVms}"
VerticalScrollBarVisibility="Never">
<CarouselView.ItemTemplate>
<DataTemplate x:DataType="local:TabViewModel">
<ContentView
x:Name="dynamiccontent"
BackgroundColor="White"
Content="{Binding DynamicContentView, Mode=TwoWay}" />
</DataTemplate>
</CarouselView.ItemTemplate>
</CarouselView>
</Grid>
.cs 文件代码
private void CarouselView_CurrentItemChanged(object sender, CurrentItemChangedEventArgs e)
{
var x = e.CurrentItem as TabItem;
var viewModel = BindingContext as xxxViewModel;
if(x.Header == Tab1)
{
viewModel.TabVms[0].DynamicContentView = new Page1();
}
if(x.Header == Tab2)
{
viewModel.TabVms[1].DynamicContentView = new Page2();
}
}
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