UITableView navigation in monotouch - xamarin.ios

Question

I'm using mono develop 3.1.1 to build an IOS application. I'm receiving an object reference error (see >>>) from my reference to the navigation controller that I've not declared properly.
My question is what's the best way to declare and instantiate the controller so I'm able to show another view from the point the table cell is selected.
Can someone help me with the correct syntax please?
public class TableHelper : UITableViewSource {
protected string[] tableItems;
protected string cellIdentifier = "TableCell";
public TableHelper (string[] items)
{
tableItems = items;
}
public override int RowsInSection (UITableView tableview, int section)
{
return tableItems.Length;
}
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
switch (tableItems[indexPath.Row])
{
case "one":
var DetailViewController = new SupportContactsDetailsScreen ();
UINavigationController controller = new UINavigationController();
// Pass the selected object to the new view controller.
>>>controller.NavigationController.PushViewController(DetailViewController, true);
break;
default:
//Console.WriteLine("Default case");
break;
}
}
public override UITableViewCell GetCell (UITableView tableView, MonoTouch.Foundation.NSIndexPath indexPath)
{
UITableViewCell cell = tableView.DequeueReusableCell (cellIdentifier);
if (cell == null)
cell = new UITableViewCell (UITableViewCellStyle.Default, cellIdentifier);
cell.TextLabel.Text = tableItems[indexPath.Row];
return cell;
}
}

Answer 1

The way that I usually go about doing this is to keep a reference to the main UIViewController (the view controller that holds the UITableView) for that particular set of views and access that Navigation Controller through the NavigationController property. (Another technique taken by Xamarin in the code sample linked below is to pass the UINavigationController in directly.)
So I would alter your class by adding:
UIViewController parentViewController;
public TableHelper(string[] items, UIViewController vc)
{
tableItems = items;
parentViewController vc;
}
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
switch (tableItems[indexPath.Row])
{
case "one":
var DetailViewController = new SupportContactsDetailsScreen ();
UINavigationController controller = new UINavigationController();
// Pass the selected object to the new view controller.
parentViewController.NavigationController.PushViewController(DetailViewController, true);
break;
default:
//Console.WriteLine("Default case");
break;
}
}
Xamarin has a document on their docs site as well as some code on their Github that talks about this further. Another important note is what the type of view controller is (regular UIViewController, UITableViewController, etc.).