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How to format the group header for different levels of grouping in Xamarin.Forms ListView(SfListView)?

Platform: Xamarin.Forms |
Control: SfListView |
Published Date: July 7, 2020 |
Last Revised Date: July 7, 2020

You can format the different levels of the group by binding the converter for the loaded elements to the GroupHeaderTemplate in Xamarin.Forms SfListView.

Xaml

Defined group header template with converter.

<syncfusion:SfListView.GroupHeaderTemplate>
    <DataTemplate>
        <ViewCell>
            <ViewCell.View>
                <StackLayout BackgroundColor="{Binding Level, Converter={StaticResource groupHeaderConverter}}" 
                                Padding="{Binding Level,Converter={StaticResource groupHeaderConverter}}">
                    <Label x:Name="label" Text="{Binding Key}" 
                            FontSize="22"                                   
                            FontAttributes="Bold"                                    
                            VerticalOptions="Center" 
                            HorizontalOptions="Start" 
                            />
                </StackLayout>
            </ViewCell.View>
        </ViewCell>
    </DataTemplate>
</syncfusion:SfListView.GroupHeaderTemplate>

C#

Set BackgroundColor and Padding to the different group levels.

public class GroupHeaderConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (targetType.Name == "Color")
        {
            if ((int)value == 1)
                return Color.Aqua;
            else
                return Color.AntiqueWhite;
        }
        else
        {
            if ((int)value == 1)
                return new Thickness(5, 5, 5, 0);
            else
                return new Thickness((int)value * 15, 5, 5, 0);
        }
    }
 
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value;
    }
}

Output:

Image for customizing group header based on level in Xamarin.Forms SfListView.

View sample in GitHub

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