As with the navigation controller, you can modify the behaviors of a toolbar by using methods and properties. You can change the order of tab items, change the tab items, and find or set the currently selected tab.
In this section, you create a tab for the About view. Note that you could do all this in the storyboard, but going through the following steps gives you a chance to dynamically update the tab bar items:
1. Remove the About button from the navigation items in the main add/view scene by selecting the bar button item in IB or the browser and deleting it.
ViewController.m and remove the import of
AboutViewController.h. Also remove the
aboutCarValet: method implementation from the file, as well as the declaration ...