2009 iPhone SDK编程入门指南：全面教程

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"《iPhone SDK编程：初学者指南》(英文)是由詹姆斯·A·布兰南编著的一本针对iOS开发者的入门书籍，于2009年由麦格劳-希尔公司(McGraw-Hill)出版。该书以PDF格式提供，旨在帮助初次接触iPhone SDK的新手理解并掌握苹果移动应用开发的基础知识。本书涵盖了广泛的iPhone应用程序开发主题，包括但不限于：SDK概述、Xcode的使用、Objective-C语言基础、iPhone用户界面设计、网络编程、多媒体处理、数据库集成以及调试与测试等核心概念。作者通过详尽的步骤和实例，使读者能够逐步建立起自己的iOS应用开发能力。版权方面，所有内容受到1976年美国版权法保护，未经麦格劳-希尔公司预先书面许可，不得以任何形式复制、分发或存储在数据库或检索系统中。本书的国际版本与纸质版相对应，ISBN号分别为978-0-07-162650-7（电子版）和978-0-07-162649-1（印刷版），均有独特识别号MHID。此外，书中尊重商标权，对于提及的品牌和产品名称，仅在编辑风格下使用，并非商业性引用，目的是维护商标所有者的权益，无意侵犯其商标权。在书中的某些地方，商标名会以大写字母形式出现，这是遵循了相应的商标使用规范。《iPhone SDK编程：初学者指南》不仅适合个人学习者使用，也适用于企业作为员工培训或激励奖励的资源，因为麦格劳-希尔公司提供了针对大量使用的特别折扣。通过这本书，无论是希望进入iOS开发领域的新人，还是希望提升现有技能的专业人士，都能从中找到宝贵的学习材料和实践经验。"

Introduction

he response to the iPhone is overwhelming. The App Store has captured the hobbyist’s

imagination like no other platform in recent memory. Hobbyists have made—and

will continue making—money from their creations sold on the App Store. And we aren’t

necessarily talking about high-minded technical innovations. The media has reported that

apps that make your iPhone pass gas have made folks hundreds of thousands of dollars.

Rival farting App developers have even gone so far as suing one another over the App Store’s

precious revenue. The iPhone and the App Store are here to stay—well, at least until the next

big thing comes along.

As proof of the iPhone’s popularity, since posting a few tutorial videos on Vimeo, people

from Asia, Europe, and South America have contacted me about the videos. So, when I decided

upon writing this book, I remembered this international appeal of the iPhone. I tried making

this book as accommodating as possible for as wide an audience as possible. I have kept

colloquialisms to a minimum, for instance. But more importantly than avoiding colloquialisms,

the book relies upon discrete, numbered steps that illustrate each major concept. Rather than a

lot of prose describing the iPhone SDK, I show you the iPhone SDK.

The Book’s Focus

This book has two goals. The first goal is getting you comfortable with using the iPhone’s user

interface controls in Interface Builder. Interface Builder is a useful tool that removes much

complexity from creating and laying out user interface controls. It is this book’s premise that

once you master this tool, building a graphical user interface (GUI) using Interface Builder is

quicker and more intuitive than using code.

xvi iPhone SDK Programming: A Beginner’s Guide

The other goal this book has is brushing up your C and introducing you to Objective-C.

Most likely you haven’t used C since college. After refreshing your memory on C, the book

moves to Objective-C, the language of choice for Mac OS X and iPhone OS applications.

The book also provides a two-chapter Objective-C tutorial. Based on the number of jobs

listed on www.DICE.com for Objective-C programmers nationwide (fewer than 100), chances

are you have never used Objective-C. But Objective-C is the language used for Cocoa and

Cocoa Touch, so you must understand Objective-C if you wish to program for the iPhone.

This book provides two chapters on Objective-C and tries sneaking Cocoa topics into the book

where appropriate.

NOTE

This book’s code examples can be downloaded at www.mhprofessional.com/

computingdownload. The book’s code examples are also available at the author’s

website: www.jamesabrannan.com. Videos accompanying each Try This example are

available on the author’s website.

The Book’s Content

The book assumes no prior C or Objective-C knowledge. Although not comprehensive,

chapters on C and Objective-C should provide enough detail to understand the book’s

remaining chapters. The book starts with the prerequisites. Both C and Objective-C are

prerequisites to programming iPhone applications. You don’t need to be a C expert to use

Objective-C, but you should remember C’s basics. After providing a C refresher, the book

has two chapters on Objective-C. These chapters are somewhat cumbersome, and not nearly

as exciting as the remaining chapters, but Objective-C is the language used for Cocoa Touch,

so you’d be advised to learn it. After learning Objective-C, the book provides a chapter on

installing an iPhone application on an iPhone or iPod touch. It also provides a tutorial on

debugging and testing your application.

Chapter 6 finally begins the book’s UIKit coverage. Chapters 6 through 10 discuss the

UIView subclasses you use when laying out an iPhone application. Chapter 11 discusses alerts,

action sheets, and application badges. Chapters 12 and 13 discuss the many controls available

for an iPhone user interface. Chapter 13 also discusses how to use an iPhone’s camera.

After learning about the UIKit, the book then moves to discussing several other essential

iPhone application-programming topics. Chapter 14 discusses setting your application’s

preferences using the Settings application. Chapter 15 discusses file I/O, property lists, and

archiving objects. Chapter 16 discusses using the iPhone’s built-in database, SQLite. And

Chapter 17 discusses Core Data, by far the easiest persistence framework you can use while

programming an iPhone. Chapter 18 discusses using iTunes music in your application.

2 iPhone SDK Programming: A Beginner’s Guide

Key Skills & Concepts

● Understand the App Store

● Understand how to obtain Xcode and the iPhone SDK

● Understand if this book is right for you

● Understand Xcode’s help and Apple’s online documentation

● Understand this book is about User Interface controls and using Interface Builder

am mostly a loner—nobody calls me—so why do I pay over 100 dollars a month for an

iPhone? It is a darn useful toy—I mean tool. The last time I got lost, I started the Maps

application, and within seconds, it had located my position and provided me with a map.

I can check my e-mail anywhere, and the last time I needed to impress my friends,

I bought and installed the iFart application. I use the iPod app to listen to music, and every

once in a long while, someone calls.

As well as being mostly a loner, I am also an old guy and not the best candidate for

expounding the iPhone’s many virtues. For instance, I think texting is a time-waster. But my

14-year-old nephew, here on vacation the other week, certainly didn’t think so. He spent the

majority of his time texting friends back home. About what, who can guess, but he did it, and

my brother was paying for it. I should also mention he downloaded apps from the App Store,

and my brother was paying for those, too.

If you want some of my nephew’s money—I mean my brother’s money—you can get

some by writing and selling an iPhone application on the App Store. Unfortunately, the sure

path to riches, iPhone pornography and iPhone gambling, is off limits on the App Store, but

there are plenty other applications you might write.

The App Store

The App Store is a unique concept. The App Store is an Apple application on iPhones and iPod

touches. You use the App Store to browse and download applications from Apple’s iTunes Store.

Some applications are free, while others have a (usually) nominal charge. Using your iTunes

account, you can download applications directly to your iPhone or iPod Touch. What I like is that

I can use an iTunes Gift Card that I can buy at my local grocery store; no credit card needed.

Don’t know what to buy? You can go to one of the many Web sites dedicated to reviewing

applications on the App Store. For instance, www.appstoreapps.com (Figure 1-1) provides

reviews of both free and paid applications. Most applications are junk, but some are quite good.

Downloading applications from the App Store is both easy and inexpensive. That makes

it a lucrative market for independent developers wishing to take advantage of the iTunes

Store’s large user base. Independent developers can develop applications for the App Store by

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