iOS Programming: The Big Nerd Ranch Guide

UIViewController Initializers

When you created a tab bar item for BNRHypnosisViewController, you overrode initWithNibName:bundle:. However, when you initialized the BNRHypnosisViewController instance in BNRAppDelegate.m, you sent it init and still got the tab bar items. This is because initWithNibName:bundle: is the designated initializer of UIViewController. Sending init to a view controller calls initWithNibName:bundle: and passes nil for both arguments.

BNRHypnosisViewController does not use a NIB file to create its view, so the filename parameter is irrelevant. What happens if you send init to a view controller that does use a NIB file? Let’s find out.

In BNRAppDelegate.m, change your code to initialize the BNRReminderViewController ...