将工具栏添加到导航视图控制器的正确方法是什么？

So I'm trying to add a UIToolbar to a UIViewController that is part of a UINavigation hierarchy and I was wondering what is the best way to do this. I know in iOS3 they enabled each viewcontroller that is part of a navigation hierarchy to have it's own toolbar so I figure this is the best way to do it. However, the syntax of how I'm doing is bugging me, as I'm using three different types of syntax to add the toolbar as follows:So I'm trying to add a UIToolbar to a UIViewCon