How to work with RTL in Xamarin.Forms TreeView (SfTreeView)

You can use SfTreeView with RTL in Xamarin.Forms by setting the FlowDirection property for SfTreeView.

You can also refer the following article.

https://www.syncfusion.com/kb/11414/how-to-work-with-rtl-in-xamarin-forms-treeview-sftreeview

XAML

Set FlowDirection as RightToLeft to TreeView.

<treeview:SfTreeView x:Name="treeView" ItemHeight="40" Indentation="15" ExpanderWidth="40" AutoExpandMode="AllNodesExpanded" VerticalOptions="Center"
                        FlowDirection="{OnPlatform Android='RightToLeft',iOS='RightToLeft'}" ItemTemplateContextType="Node" ChildPropertyName="SubFiles" 
                        ItemsSource="{Binding ImageNodeInfo}">
    <treeview:SfTreeView.ItemTemplate>
        <DataTemplate>
            <ViewCell>
                <ViewCell.View>
                    <Grid x:Name="grid" Padding="5,5,5,5" RowSpacing="0">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="40" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>
                        <Image Source="{Binding Content.ImageIcon}" VerticalOptions="Center" HorizontalOptions="Center"
                                HeightRequest="35" WidthRequest="35"/>
                        <Grid Grid.Column="1" RowSpacing="1" Padding="1,0,0,0" VerticalOptions="Center">
                            <Label Text="{Binding Content.ItemName}" LineBreakMode="NoWrap" VerticalTextAlignment="Center" HorizontalOptions="{OnPlatform iOS='StartAndExpand'}"/>
                        </Grid>
                    </Grid>
                </ViewCell.View>
            </ViewCell>
        </DataTemplate>
    </treeview:SfTreeView.ItemTemplate>
</treeview:SfTreeView>

In UWP platform, the ScrollView is not changed when RTL is enabled (framework issue). To overcome this issue, set the FlowDirection property in constructor of MainPage in UWP renderer.

C#

Set FlowDirection to RightToLeft in constructor of MainPage

namespace TreeViewXamarin.UWP
{
    public sealed partial class MainPage
    {
        public MainPage()
        {
            this.InitializeComponent();
            this.FlowDirection = FlowDirection.RightToLeft;
            SfTreeViewRenderer.Init();
            LoadApplication(new TreeViewXamarin.App());
        }
    }
}

Output