In Chapter 7, you learned about UITabBarController and how it allows a user to access different screens. A tab bar controller is great when you have screens that don’t rely on each other, but what if you want to move between related screens?
For example, the Settings application has multiple related screens of information: a list of settings (like Sounds), a detailed page for each setting, and a selection page for each detail. This type of interface is called a drill-down interface.
In this chapter, you will use UINavigationController to add a drill-down interface to Homepwner that lets the user view and edit the details of a BNRItem. (Figure 11.1).
Figure 11.1 Homepwner with UINavigationController