How This Book Is Organized

This book is divided into three logical parts. Part I, “The Objective-C 2.0 Language,” teaches the essentials of the language. Part II, “The Foundation Framework,” teaches how to use the rich assortment of predefined classes that form the Foundation framework. Part III, “Cocoa Programming and the iPhone SDK,” gives you an overview of Cocoa’s Application Kit framework and then walks you through the process of developing a simple iPhone application using the UIKit framework, and developing and debugging the code with Xcode and Interface Builder.

A framework is a set of classes and routines that have been logically grouped together to make developing programs easier. Much of the power of programming in Objective-C rests on the extensive frameworks that are available.