Adding a navigation bar to a web view in a tab bar app

I've built the tab bar application in IB, with three tabs. The third tab happily displays a UIWebview where you can browse. The only thing missing is a back button, as not all web pages supply such a link.

I need a navigation bar hooked up properly to the correct classes. I'm still a bit unsure about exactly how the hierarchy should look in interface builder and how to hook it up properly.

Currently, the third tab is hooked up to a referencing outlet called 'webnews' in the class 'thirdviewcontroller', and the UIWebView (under a normal IUView in the hierarchy, which in turn is under the third tab bar controller) is connected to the webnews outlet.

How do I make the navbar control the webview, and do I add code to the thirdviewcontroller.m that lets the navbar on the view control the webview 'back' function? What do I hook up as the delegate for it? Currently I have an app delegate, but that's hooked up to the tab bar.

I'm not really after specific code as much as a general 'how it works' clue :) (Unless I can just add the navbar dynamically to the functioning app... but I don't think addSubView on viewWillAppear {} in thirdviewcontroller.m will create t开发者_Python百科he proper functionality?)

If I were to guess at the simplest solution, I'd guess create a navbarcontroller.h/.m, slap a navbar on the view in IB, connect the third tab to navbarcontroller, connect the navbar to the webview (?) and move the webnews outlet to navbarcontroller.h, and connect the webview to it. But I don't quite have the nerve to try, better to ask advice first.

Answering this, see similar Detect and handle, or override, clicks on a navigation bar