Sams Teach Yourself Core Data for Mac and iOS in 24 Hours

Mac OS and iOS apps are written using the Objective-C language. Right there, some people might panic and throw up their hands, but do not worry. As pointed out previously, you write very little code from scratch. Much of the code that you run is already written for you using Objective-C; that code is in the Cocoa and Cocoa Touch frameworks that support everything from animation to native platform appearance and the Core Data and various table view classes that are the topic of this book. (Cocoa Touch is the version that runs on iOS; unless otherwise noted, references to Cocoa include Cocoa Touch in this book, just as references to iPhone include iPod touch.)

When you're working inside the Cocoa framework and the other components of iOS and Mac OS, most of your work consists of calling existing methods and occasionally overriding them for your own purposes. Xcode 4 provides a new development environment that is heavily graphical in nature. You will find yourself drawing relationships in your data model and, in the interface, drawing connections between objects on the interface and the code that supports them.

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