First, we changed the title from iPhone Programming to iOS Programming. As this change implies, the second edition includes more iPad-specific information. For instance, we’ve added new chapters on UIPopovercontroller and UISplitViewController, which exist only on the iPad.

Core Data has matured considerably since the first edition, so we decided a chapter on using SQLite directly was unnecessary. The Core Data chapter was moved earlier in the book to reflect its increased importance.

You’ll find new chapters on push notifications and blocks. We’ve also added a chapter dedicated to the static analyzer and the Instruments profiling tool.

This edition assumes that the reader is using Xcode 4. For more information on getting Xcode 4, see the final section of this introduction.

Besides these obvious changes, we made thousands of tiny improvements that were inspired by questions from our readers and our students. Every page of this book is just a little better than the corresponding page from the first edition.