Navigation Controller that doesn't use the whole screen

I have a navigation controller which I don't want to use up the whole screen. In particular, I want to put a logo image in a bar at the top of the screen. Unfortunately, the navigation controller doesn't seem to be designed this way. In interface builder, I can't make it take up part of a screen. How would you achieve the effect of a logo image up the top and a navigation controller taking up the rest of the screen?