How do i add add a navigation controller to a xib

Having only used storyords to subclass a navigation controller before I cant find any tutorial on how to do this for xibs.

How do I add a naviagtion controller to a certain xib so I can subclass it? Then I can override the rotation for my view. The part im stuck on is how does the view controller know about the navigation controller? In storyboards I would manually hook it up to my view controller. I just cant work it out with xibs?

Ive added a navigation controller next to my views xib...now I need some advice from here.

Also I've created iPad views from my original iPhone xibs. When I drag the nav controller from IB its still in the iPhone screen size?