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》是一本针对初学者的iPhone应用开发书籍，由James A. Brannan撰写。本书旨在帮助读者掌握Objective-C编程语言，以便在iOS平台上开发应用程序。书中内容可能涵盖Objective-C的基础语法、类与对象、内存管理、Cocoa Touch框架、UI设计、事件处理以及测试和发布应用的基本流程。" 这篇书籍的核心知识点包括： 1. **Objective-C基础**：Objective-C是Apple开发的面向对象的编程语言，它是iOS和macOS开发的基础。书中会详细介绍Objective-C的语法，如消息传递机制、类的定义、对象的创建和使用，以及如何进行面向对象编程。 2. **内存管理**：Objective-C使用引用计数进行内存管理，理解 retain、release、autorelease等概念至关重要。读者将学习如何正确管理内存，避免内存泄漏和其他相关问题。 3. **Cocoa Touch框架**：Cocoa Touch是iOS开发中的核心框架，提供了UI组件和许多系统服务。书中会涉及UITableView、UIButton、UIViewController等基本组件的使用，以及手势识别和动画效果的实现。 4. **用户界面设计**：开发一款成功的iPhone应用，良好的用户界面设计是关键。书里可能会讲述Storyboard、Auto Layout、Size Classes等内容，帮助开发者创建响应式和适应不同设备尺寸的界面。 5. **事件处理**：了解事件驱动编程模型，如触摸事件、按钮点击事件的处理，以及如何在视图控制器间进行通信。 6. **程序调试与测试**：调试技巧和工具的使用，如何使用Xcode的内置调试器进行代码调试，以及单元测试和集成测试的重要性。 7. **应用发布**：最后，书中可能会介绍如何配置项目以准备提交App Store，包括证书设置、应用版本管理、打包和提交应用到App Store的流程。通过这本书，读者不仅可以学习到Objective-C语言，还能了解到完整的iOS应用开发流程，从编写代码到构建实际的应用。虽然现在Swift已经成为了更推荐的iOS开发语言，但Objective-C作为iOS开发的历史基石，对于理解Apple生态系统仍然有着重要的价值。对于想要深入学习iOS开发的初学者来说，这本书是一个很好的起点。

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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