Get start position of a listview scroll to end in xamarin forms wpf - xamarin

Question

I have worked on getting listview scroll position scroll to end in xamarin forms WPF application. I have tried below solution, it works in ios and android but unfortunately, it doesn't work in wpf application. Please suggest any idea to get scroll position of a listview end in xamarinforms WPF application.
Sample code you can find in below link
https://stackoverflow.com/questions/40373761/how-to-set-listview-to-start-showing-the-last-item-instead-in-xamarin-forms

Answer 1

If you're working with Xamarin Forms, you can create a control that extend from ListView and add methods for scrolling to top or bottom.
namespace YourAppName.Controls
{
public class CustomListView : ListView
{
public CustomListView() : this(ListViewCachingStrategy.RecycleElement)
{
}
public CustomListView(ListViewCachingStrategy cachingStrategy)
: base(cachingStrategy)
{
}
public void ScrollToFirst()
{
Device.BeginInvokeOnMainThread(() =>
{
try
{
if (ItemsSource != null && ItemsSource.Cast<object>().Count() > 0)
{
var firstItem = ItemsSource.Cast<object>().FirstOrDefault();
if (firstItem != null)
{
ScrollTo(firstItem, ScrollToPosition.Start, false);
}
}
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
});
}
public void ScrollToLast()
{
try
{
if (ItemsSource != null && ItemsSource.Cast<object>().Count() > 0)
{
var lastItem = ItemsSource.Cast<object>().LastOrDefault();
if (lastItem != null)
{
ScrollTo(lastItem, ScrollToPosition.End, false);
}
}
}
catch(Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
}
}
}
And on your xaml:
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:controls="clr-namespace:YourAppName.Controls"
x:Class="YourAppName.Views.CustomListViewPage">
<controls:CustomListView
x:Name="customListView"
ItemsSource="{Binding Items}"
SeparatorVisibility="None"
SelectionMode="None"
HasUnevenRows="true">
<controls:CustomListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Label
FontSize="Medium"
Text="{Binding TestText}" />
</ViewCell>
</DataTemplate>
</controls:CustomListView.ItemTemplate>
</controls:CustomListView>
</ContentPage>
And on the code behind you can do something like this:
namespace YourAppName.Views
public partial class CustomListViewPage : ContentPage
{
public CustomListViewPage()
{
InitializeComponent();
}
protected override void OnAppearing()
{
base.OnAppearing();
this.customListView.ScrollToLast();
}
}