How is the iPod app on the iPhone designed?

Is it just a tab-bar controller that loads some UITableViews that has navigation items set?开发者_StackOverflow Or is it a tab-bar controller that is loading a navigation controller?

Tab-bar controller loading navigation controllers. That's the proper way to enable table drilling down to the content. If I recall properly you have to do this in code, IB can't nest these properly.