Want to quickly learn how to write iOS and Mac apps? Then this book, teaching the art of programming in the Objective-C language, should become your desktop! Based on the training course of the famous educational IT project Big Nerd Ranch, This book introduces you to the basics of programming in C and Objective-C and developing effective applications for Apple devices. The book covers the latest versions of Xcode 4.2. IOS 5 and Mac OS X 10.7 Lion and will be useful as novice programmers, and more experienced specialists who are not yet familiar with Objective-C and the creation of applications for Apple devices.