Can you provide an example of how to use the LoadMore() method in MvvmCross

Step 1: Define the ViewModel

First, you need to define a ViewModel that will handle the data loading. This ViewModel should include an `ObservableCollection` to store the items and a `LoadMore` method to fetch additional data.

csharp
using MvvmCross.ViewModels;
using System.Collections.ObjectModel;
using System.Threading.Tasks;

public class MyViewModel : MvxViewModel
{
    private readonly IMyDataService _dataService; // Assume this is your data service
    private int _currentPage = 1; // Current page for pagination
    private bool _isBusy = false; // Flag to prevent multiple simultaneous requests

    public ObservableCollection Items { get; } = new ObservableCollection();

    public MyViewModel(IMyDataService dataService)
    {
        _dataService = dataService;
    }

    public async Task LoadMore()
    {
        if (_isBusy) return; // Prevent multiple simultaneous requests

        _isBusy = true;
        try
        {
            var newItems = await _dataService.GetMoreItemsAsync(_currentPage);
            foreach (var item in newItems)
            {
                Items.Add(item);
            }
            _currentPage++;
        }
        catch (Exception ex)
        {
            // Handle the exception
        }
        finally
        {
            _isBusy = false;
        }
    }
}

Step 2: Implement Infinite Scroll in the View

To implement infinite scroll, you need to detect when the user has scrolled to the end of the list. This is typically done by adding a scroll listener to your list control.

Android Implementation

On Android, you can use `MvxListView` and implement `IOnScrollListener`. Here's how you might do it:

csharp
using MvvmCross.Platforms.Android.Views;
using Android.Widget;

public class MyView : MvxActivity
{
    private MvxListView _listView;

    protected override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        SetContentView(Resource.Layout.MyLayout);

        _listView = FindViewById(Resource.Id.listView);
        _listView.SetOnScrollListener(new MyScrollListener(this));
    }

    private class MyScrollListener : Java.Lang.Object, AbsListView.IOnScrollListener
    {
        private readonly MyView _view;

        public MyScrollListener(MyView view)
        {
            _view = view;
        }

        public void OnScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
        {
            if (firstVisibleItem + visibleItemCount >= totalItemCount)
            {
                _view.ViewModel.LoadMore();
            }
        }

        public void OnScrollStateChanged(AbsListView view, ScrollState scrollState) { }
    }
}

iOS Implementation

On iOS, you can use `UITableView` and implement `UIScrollViewDelegate`. Here's a basic example:

csharp
using MvvmCross.Platforms.Ios.Views;
using UIKit;

public class MyView : MvxViewController
{
    private UITableView _tableView;

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        _tableView = new UITableView(View.Bounds);
        View.AddSubview(_tableView);
        _tableView.Delegate = new MyTableViewDelegate(this);
    }

    private class MyTableViewDelegate : UITableViewDelegate
    {
        private readonly MyView _view;

        public MyTableViewDelegate(MyView view)
        {
            _view = view;
        }

        public override void WillDisplayCell(UITableView tableView, UITableViewCell cell, NSIndexPath indexPath)
        {
            if (indexPath.Row == _view.ViewModel.Items.Count - 1)
            {
                _view.ViewModel.LoadMore();
            }
        }
    }
}

Step 3: Data Binding

Ensure that your list control is bound to the `Items` collection in your ViewModel. This is typically done in the XAML or layout file for your View.

Conclusion

Implementing infinite scroll in MvvmCross involves creating a `LoadMore` method in your ViewModel and detecting when the user has scrolled to the end of the list in your View. You then call `LoadMore` to fetch additional data and add it to your collection, which should automatically update the UI due to data binding.