Objective-C入门指南：iPhone开发者必备

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"Objective-C for iPhone Developers: A Beginner's Guide" 本书《Objective-C for iPhone Developers: A Beginner's Guide》由James A. Brannan撰写，旨在为初学者提供一个全面了解和学习Objective-C编程语言以及使用它进行iPhone应用开发的指南。出版于2010年，由McGraw-Hill公司发行，适用于对iPhone开发感兴趣的读者。 Objective-C是Apple公司为Mac OS X和iOS操作系统开发的主要编程语言，它是C语言的一个超集，包含了Smalltalk的面向对象特性。本书围绕Objective-C的基础知识展开，讲解了如何利用这种语言来创建iPhone和iPad应用程序。在书中，作者将带领读者逐步了解Objective-C的关键概念，包括类、对象、消息传递、继承、多态性以及内存管理等核心面向对象编程原则。此外，还将探讨Foundation框架，这是iOS开发中必不可少的一部分，提供了许多基本数据类型和常用工具类。除了编程基础，本书还会介绍Xcode IDE，它是Apple官方提供的开发环境，用于编写、测试和调试iOS应用。读者将学习如何设置开发环境，创建项目，编写代码，并使用Interface Builder设计用户界面。在iPhone开发方面，本书涵盖了Apple的UIKit框架，这是构建iOS用户界面的核心。这包括控件（如按钮、文本字段）、视图（如UIImageView和UILabel）以及事件处理等。书中还可能涉及动画、触摸输入、多任务处理、网络通信、数据持久化等方面的知识。此外，本书可能还讨论了iOS应用的生命周期，应用程序的测试和调试技术，以及如何准备应用发布到App Store的流程。对于初学者，书中可能包含了许多实践项目和示例代码，帮助读者巩固理论知识并提升实际操作能力。《Objective-C for iPhone Developers: A Beginner's Guide》是一本全面的入门教程，适合没有任何或少量编程经验的人开始他们的iPhone开发之旅。通过这本书，读者不仅可以掌握Objective-C语言，还能了解到整个iOS开发生态系统，为成为一名成功的iPhone开发者打下坚实的基础。

Chapters 8, 9, and 10 introduce you to several Foundation framework concepts.

Beginning with Chapter 8, the book diverges from presenting Objective-C language

concepts and begins presenting fundamental classes and concepts for programming for

the iPhone. These classes are all part of the Foundation framework, a collection of Apple-

provided code that makes writing applications easier. The concepts presented are tailored

to iPhone development, so no desktop-only classes or concepts are discussed. Chapter 8

explores several Foundation framework classes. These classes make string manipulation,

managing collections of objects, and reading and writing from files much easier. Chapter 9

presents the Foundation framework classes used for reading and writing to files. The

chapter also discusses the iPhone directories you have available and provides specific

code examples for working with those directories. Chapter 10 continues presenting

Foundation framework classes. In this chapter you learn about property lists, the NSCopy

protocol, and how to archive and de-archive your application’s objects to a file.

Chapter 11 introduces you to selectors and targets. Selectors and targets are initially

one of Objective-C’s more confusing aspects. However, you should take the time to

carefully learn these concepts, as they allow significant programming flexibility. In

essence, what these concepts allow is for a program to dynamically decide at runtime

what objects and methods to call. If you are familiar with Java’s reflection, then selectors

should not appear foreign. In fact, having worked extensively with both, I find using

Objective-C’s selectors and targets much easier than working with Java’s reflection.

Chapter 12 returns to basic object-oriented principles by discussing the Model-

View-Controller (MVC) design pattern. I end the book with the MVC for good reason.

It is fundamental to how you write programs for the iPhone SDK. Moreover, this design

pattern has a rich history and is arguably the single most influential concept leading to the

Mac and Windows operating systems. Without MVC, we just might still all be using DOS

prompts.

Accompanying Tutorial Videos

This book is only one of many books recently released on the Objective-C programming

language. Moreover, it is relatively late to arrive, as there are several other high-quality

beginner books already on the shelves. So why buy this book? First, as the author, of

course I believe this book to be superior to the other books. But more objectively, this

book offers video tutorials for all its Try This examples. Oftentimes, steps get lost in a

numbered list of printed steps. Moreover, small details are often missed. By offering video

tutorials, I hope to reinforce the tutorials presented in the book.

Introduction xv

The application is rated two-and-a-half stars. A typical review says, “it blows” or

“don’t buy” or “a waste.” Of course, there are 7728 reviews as of December 12, 2009,

and at 99 cents a download, that is over $3500 earned from people who hate the game.

Moreover, for every review, there are probably countless folks who bought the App and

didn’t leave a review. Not bad for a product that folks universally condemn as dumb and a

waste of time. The reviews literally warn you not to buy it, but folks—presumably men—

do anyway.

But before you say, “aha, sex sells,” search the App Store using the keyword “girls.”

You will be disappointed; there are pages of time-wasting Apps featuring bikini-clad

figures, most of which make the authors little to no money. So even if you do write the

next “virtual girlfriend” App, having it stand out from all the others will prove difficult

and time consuming. That’s the App Store’s reality. Moreover, every few months you hear

of Apple purging the store of questionable material, so why risk it?

Getting noticed these days requires a quality product, with advertising and exposure.

Although there are exceptions, you should approach iPhone development with a realistic

perspective. Getting rich writing iPhone Apps requires hard work. Moreover, the quality

of your App doesn’t necessarily ensure success. Just like any other product in any other

market, these days, most Apps require advertising. And advertising is not cheap. And even

then, chances are, you will not earn enough money to quit your job or drop out of school.

At least not immediately.

Getting rich writing an App presupposes a quality App. Writing a quality App requires

understanding the iPhone SDK and Cocoa Touch. Understanding the iPhone SDK and

Cocoa Touch requires understanding basic Objective-C. So before you rush out and

buy a book on “opening your iPhone business” you should first learn Objective-C’s

fundamentals. This book teaches those fundamentals.

A Teen Developer

But you can make money on the App Store; even if you’re in high school, with your

parents’ support, you can sell Apps on Apple’s App Store. Daniel Shaffer, a senior in high

school in NYC, has made over $14,000 and has sold over eleven Apps. His Apps include

iMprint illusions, Utilitybox, and several others.

Introduction xvii

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