3.7. Navigation Bars

The iPhone doesn't support toolbars in the traditional desktop sense. Because each screen of an application is considered a page in a book, Apple has made their version of the toolbar for iPhone to appear more book-like as well. In contrast to toolbars, which can display a clutter of different icons, navigation bars are limited to include a page title (e.g., "Saved Messages"), directional buttons to parent pages, and text buttons for context-sensitive functions such as turning on the speakerphone or clearing a list of items. Navigation bars can also support controls to add tabbed buttons such as the "All" and "Missed" call buttons when viewing recent calls.

3.7.1. Creating a Navigation Bar

To create a navigation bar, instantiate it as an object and call its initWithFrame method—just like a UIView.