Xamarin iOS pop complete UINavigationController from stack - xamarin.ios

Question

I pretty new to Xamarin.iOS and I need some help on the navigation.
To make it short, here is how the navigation should work in my application:
My application consists of 3 screens.
Screen 1 :
This is a simple UITableViewController where I can add items to the list.
When I add an item I have a segue (show details) to screen 2.
Screen 2 & 3:
Screen 2 is embedded in a UINavigationController.
Screen 3 is the end of my wizzard to add an item.
On screen 3 when I'm done, I have a button to navigate back to Screen 1.
How do I navigate from there and remove from the stack the UINavigationController, Screen 2 & 3?

Answer 1

use the PopToRootViewController() method on UINavigationController
nav.PopToRootViewController(true);

Answer 2

From Xamarin docs: Creating an Unwind Segue
An unwind Segue can be used to navigate back through a push or modal segue - for
example by dismissing the modally presented view controller. In addition to this, you can unwind through not only one, but a series of push and modal segues and go back multiple steps in your navigation heirarchy with a single unwind action.
You just need this piece of code in the target UIViewController
[Action ("UnwindToTargetViewController:")]
public void UnwindToTargetViewController (UIStoryboardSegue segue)
{
Console.WriteLine ("We've unwinded to Target!");
}
On the OriginViewController, just link a button with the exit scene and select the method you just created!