The Core iOS Developer’s Cookbook, Fifth Edition

Recipe: The Navigation Item Class

The objects that populate the navigation bar are put into place using the UINavigationItem class, which is a class that stores information about those objects. Navigation item properties include the left and right bar button items, the title shown on the bar, the view used to show the title, and any Back button used to navigate back from the current view.

This class enables you to attach buttons, text, and other UI objects in three key locations: the left, the center, and the right of the navigation bar. Typically, this works out to be a regular button on the right, some text (usually the UIViewController’s title) in the middle, and a Back-style button on the left. But you’re not limited to this layout. You ...