public override UITableViewCell GetCell (UITableView tv)
{
var cell = base.GetCell (tv);
if (Url == null)
return cell;
var spinner = cell.ViewWithTag (SPINNER_TAG) as UIActivityIndicatorView;
if (loading){
if (spinner == null)
StartSpinner (cell);
else
if (spinner != null)
RemoveSpinner (cell, spinner);
}
return cell;
}