private async Task InitTableViewAsync()
{
// delay is need to delay UI thread freezing while TableNode items are loaded
// thus previous screen will not be frozen
await Task.Delay(1);
Table.KeyboardDismissMode = UIScrollViewKeyboardDismissMode.Interactive;
Table.TranslatesAutoresizingMaskIntoConstraints = false;
Table.BackgroundColor = UIColor.FromRGB(245, 245, 245);
Table.AddGestureRecognizer(new UITapGestureRecognizer((obj) => Input.TextView.ResignFirstResponder()));
var tableSource = new GroupedTableDataSource <DateTimeOffset, ChatMessageViewModel>(
ViewModel.MessagesList.Messages,
Table,
viewModel => GetMessageNode(viewModel),
TableNode.Inverted);
Table.EstimatedRowHeight = MinCellHeight;
Table.SeparatorStyle = UITableViewCellSeparatorStyle.None;
_dataSourceRef = WeakReferenceEx.Create(tableSource);
TableNode.DataSource = tableSource;
TableNode.Delegate = _tableDelegate;
TableNode.SetTuningParameters(new ASRangeTuningParameters {
leadingBufferScreenfuls = 1, trailingBufferScreenfuls = 1
}, ASLayoutRangeType.Display);
TableNode.SetTuningParameters(new ASRangeTuningParameters {
leadingBufferScreenfuls = 1, trailingBufferScreenfuls = 1
}, ASLayoutRangeType.Preload);
TableNode.ReloadData();
TableNode.LeadingScreensForBatching = 3;
}
public override void WillDisplayNodeForRowAtIndexPath(ASTableView tableView, NSIndexPath indexPath)
{
if (_source == null)
{
var table = tableView as ASTableView;
_source = table.TableNode.DataSource as GroupedTableDataSource <DateTimeOffset, ChatMessageViewModel>;
}
var count = _source.DataSource[0].Count;
if (indexPath.Section == _source.DataSource.Count - 1 && indexPath.Row == count - 1)
{
LastItemRequested?.Invoke(this, EventArgs.Empty);
}
}