XCode 4.2 offers unprecedented power and flexibility to every OS X or iOS developer. Now that it's available on the Mac App Store, thousands of new users are diving in - and XCode 4.2's radical innovations mean that even experienced developers must start fresh. Sams Teach Yourself XCode 4 in 24 Hours is the friendly, easy guide to XCode 4.2 for every Apple developer, regardless of experience. In just 24 quick lessons, it covers everything from basic project organization to advanced reuse and testing, helping developers optimize workflows and build highly reliable software. Apple technology expert John Ray covers all this, and more: * Using XCode 4.2 with Objective-C, Cocoa, and MVC * Creating, organizing, and managing projects and files * Working with the Code Editor * Designing interfaces and linking them to code * Using source control * CoreData modeling and coding * Leveraging frameworks and libraries * Building OS X software and universal iOS apps * Unit testing, debugging, and code analysis * Using targets, schemes, and workspaces * Building widgets with Dashcode Step-by-step instructions walk through common questions, issues, and tasks... Quizzes and Exercises test readers' knowledge... "Did You Know?" tips offer insider advice and shortcuts... "Watch Out!" alerts help avoid problems. By the time readers are finished, they won't just be familiar with XCode 4.2: they'll know how to use it to write outstanding software.