How to update empty group header text in Xamarin.Forms ListView (SfListView )?
You can change the GroupHeader text based on the items count in Xamarin.Forms ListView. Please refer to the following documentation to load an empty group using ListView.
XAML
Define the converter that is bound to the GroupHeader with GroupResult as binding to display GroupHeader text based on the items count.
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:ListViewXamarin"
xmlns:syncfusion="clr-namespace:Syncfusion.ListView.XForms;assembly=Syncfusion.SfListView.XForms"
x:Class="ListViewXamarin.MainPage">
...
<ContentPage.Resources>
<ResourceDictionary>
<local:GroupHeaderConverter x:Key="GroupHeaderConverter"/>
</ResourceDictionary>
</ContentPage.Resources>
<ContentPage.Content>
<StackLayout>
<syncfusion:SfListView x:Name="listView" ItemSize="60" ItemsSource="{Binding ContactsInfo}">
<syncfusion:SfListView.ItemTemplate >
<DataTemplate>
...
</DataTemplate>
</syncfusion:SfListView.ItemTemplate>
<syncfusion:SfListView.GroupHeaderTemplate>
<DataTemplate>
<Grid BackgroundColor="Teal">
<Label Text="{Binding ., Converter={StaticResource GroupHeaderConverter}}" FontSize="22" TextColor="White" FontAttributes="Bold" VerticalOptions="Center" Margin="10,0,0,0" />
<Grid Grid.Column="1" HorizontalOptions="End" VerticalOptions="End">
<Image x:Name="button" Source="Add.png" HeightRequest="50" WidthRequest="40" >
<Image.GestureRecognizers>
<TapGestureRecognizer Command="{Binding Path=BindingContext.ButtonTappedCommand, Source={x:Reference listView}}" CommandParameter="{Binding .}"/>
</Image.GestureRecognizers>
</Image>
</Grid>
</Grid>
</DataTemplate>
</syncfusion:SfListView.GroupHeaderTemplate>
</syncfusion:SfListView>
</StackLayout>
</ContentPage.Content>
</ContentPage>
C#
Returns the text based on the GroupResult.Count property.
public class GroupHeaderConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null) return null;
var groupResult = value as GroupResult;
if (groupResult.Key.ToString() == "WORK")
return groupResult.Count > 1 ? "WORK" : "EMPTY WORK";
else
return groupResult.Count > 1 ? "PERSONAL" : "EMPTY PERSONAL";
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Hope you enjoyed learning about how to add a seperator between items in a Xamarin.Forms Listview.
You can refer to our Xamarin.Forms ListView feature tour page to learn about its other groundbreaking feature representations. You can explore our Xamarin.Forms documentation to understand how to present and manipulate data.
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