UINavigationBar
In this section, you are going to give the UINavigationBar a descriptive title for the UIViewController that is currently on top of the UINavigationController’s stack.
Every UIViewController has a navigationItem property of type UINavigationItem. However, unlike UINavigationBar, UINavigationItem is not a subclass of UIView, so it cannot appear on the screen. Instead, the navigation item supplies the navigation bar with the content it needs to draw. When a UIViewController comes to the top of a UINavigationController’s stack, the UINavigationBar uses the UIViewController’s navigationItem to configure itself, as shown in Figure 12.10.
Figure 12.10 UINavigationItem
By default, a UINavigationItem is empty. ...
Get iOS Programming: The Big Nerd Ranch Guide, 7th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
