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There are four parts to this book. You can focus on whichever one addresses an immediate problem, or you can get a good overview by reading straight through. As with all of the Sams Teach Yourself books, as much as possible each hour is made to stand on its own so that you can jump around to learn in your own way. Cross-references throughout the book help you find related material.
This part gives you the high-level view of Objective-C.
• Hour 1: Overview of Objective-C—Here you find an introduction to the development tool (Xcode) and the basics of the Cocoa and Cocoa Touch development environment. You see how to register to become an Apple developer and gain access to the resources on developer.apple.com.