iOS 4应用开发入门指南：从Hello World到高级技术

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"《 Beginning iOS 4 Application Development》是一本针对iOS开发者的经典教程，特别适合想要学习iOS 4应用程序开发的读者，尤其是那些具备一定英语阅读能力的人。本书详细地介绍了从入门到进阶的多个关键主题，旨在帮助读者掌握Objective-C编程语言在iOS平台上的应用。第一部分（Part I）着重于基础知识的建立： 1. **Getting Started**：引导读者快速上手，章节1介绍iOS 4编程的基本概念，如如何编写第一个Hello World程序。 2. **Views, Outlets, and Actions**：深入理解用户界面设计，包括视图、连接器（outlets）和动作（actions）的使用。 3. **ViewControllers**：讲解视图控制器的重要性，如何管理多个视图和处理用户交互。 4. **Multi-Platform Support**：讨论iPhone和iPad的兼容性，以及如何创建适应不同屏幕尺寸的应用。 5. **Keyboard Inputs**：处理键盘输入，实现复杂的文本输入功能。 6. **Screen Rotations**：探讨设备旋转时的适配策略，保证应用在各种屏幕方向下正常运行。第二部分（Part II）涉及数据处理和高级技术： 7. **Using the TableView**：学习如何利用表格视图来显示和组织数据。 8. **Application Preferences**：理解并创建用户可自定义的应用设置。 9. **File Handling**：掌握文件读写操作，实现本地数据存储。 10. **Database Storage Using SQLite3**：介绍如何使用SQLite进行数据库存储，处理复杂的数据结构。第三部分（Part III）探索更高级的iOS编程技巧： 11. **Simple Animations and Video Playback**：学习基本动画和视频播放的实现方法。 12. **Accessing Built-In Applications**：了解如何与系统内置应用集成，扩展应用功能。 13. **Recognizing Gestures**：掌握手势识别技术，提升用户体验。 14. **Accessing the Accelerometer**：利用加速度计实现运动检测和设备传感器应用。最后，第四部分（Part IV）涵盖了网络编程技术： 15. **Web Services**：介绍如何通过网络服务与服务器通信。 16. **Bluetooth Programming**：讲解蓝牙技术在iOS中的应用，如设备配对和数据传输。 17. **Bonjour Programming**：利用Bonjour简化网络发现和配置。 18. **Apple Push Notification Service (APNs)**：理解并实现推送通知，保持与用户的实时互动。《Beginning iOS 4 Application Development》以其全面且深入的内容，为iOS开发者提供了一个循序渐进的学习路径，无论是初学者还是进阶开发者都能从中获益匪浅。"

xiv

CONTENTS

Generating a Development Certiﬁcate 457

Creating an Application ID 461

Conﬁguring an App ID for Push Notiﬁcations 462

Creating a Provisioning Proﬁle 465

Provisioning a Device 467

Creating the iPhone Application 467

Creating the Push Notiﬁcation Provider 471

Summary 475

DISPLAYING MAPS 47CHAPTER 20: 7

Displaying Maps and Monitoring Changes Using the Map Kit 477

Getting Location Data 483

Displaying Location Using a Map 489

Getting Directional Information 493

Rotating the Map 498

Displaying Annotations 504

Reverse Geocoding 509

Displaying a Disclosure Button 513

Summary 515

BACKGROUND APPLICATIONS CHAPTER 21: 519

Understanding Background Execution on the iPhone 519

Examining the Dierent Application States 520

Opting Out of Background Mode 523

Detecting Multi-Tasking Support 524

Tracking Locations in the Background 524

Making Your Location Apps More Energy Ecient 528

Local Notiﬁcation 530

Summary 537

APPENDICEPART V: S

TESTING ON AN ACTUAL DEVICE 5APPENDIX A: 41

Signing Up for the iPhone Developer Program 541

Obtaining the UDID of Your Device 541

Logging In to the iPhone Provisioning Portal 542

Generating a Certiﬁcate 544

Registering Your Devices 547

Creating an Application ID 548

Creating a Provisioning Proﬁle 550

INTRODUCTION

WITHIN A SHORT TIME SPAN OF SIX MONTHS, Apple revised the iPhone OS twice. The ﬁrst time was in

January 2010, when Apple announced a magical and revolutionary product: the iPad. Because the

iPad is a tablet computer that is based on the iPhone OS, this meant that there were instantly more

than 250,000 applications that could run on the iPad. Then, in April Apple announced (and subse-

quently shipped in June) the next major release of the iPhone OS — 4.0. Apple also took this opportu-

nity to rename this new release of the OS, calling it iOS. This signiﬁes Apple’s grand plan to run the

iPhone OS on a wide variety of devices, not just on phones. Included with the new release of the OS is

a new SDK, the iPhone SDK 4, which enables developers to take advantage of the various features pro-

vided by the operating system — key of which is the capability to run background applications.

When I ﬁrst started learning about iPhone and iPad development, I went through the same journey

that most developers go through: Write a Hello World application, play around with Interface Builder,

try to understand what the code is doing, and repeat that process. I was also overwhelmed by the

concept of a View Controller, and wondered why it was needed if I simply wanted to display a view.

My background in developing for Windows Mobile and Android did not help much, and I had to start

working with this concept from scratch.

This book was written to help jumpstart beginning iPhone and iPad developers. It covers the various

topics in such a manner that you will progressively learn without being overwhelmed by the details.

I adopt the philosophy that the best way to learn is by doing, hence the numerous hands-on “Try It

Out” sections in each chapter, which ﬁrst show you how to build something and then explain “How

It Works.”

Although iPhone and iPad programming is a huge topic, my aim for this book is to get you started

with the fundamentals, help you understand the underlying architecture of the SDK, and appreci-

ate why things are done certain ways. It is beyond the scope of this book to cover everything under

the sun related to iPhone and iPad programming, but I am conﬁdent that after reading this book

(and doing the exercises), you will be well equipped to tackle your next iPhone or iPad programming

challenge.

WHO THIS BOOK IS FOR

This book is for the beginning iPhone and iPad developer who wants to start developing applications

using the Apple iPhone SDK. To truly beneﬁt from this book, you should have some background in

programming and at least be familiar with object-oriented programming concepts. If you are totally

new to the Objective-C language, you might want to jump straight to Appendix D, which provides

an overview of the language. Alternatively, you can use Appendix D as a quick reference while you

tackle the various chapters, checking out the syntax as you try the exercises. Depending on your

learning style, one of those approaches should work best for you.

xviii

INTRODUCTION

While most of the chapters are geared toward developing for the iPhone, the concepts apply to iPad

development as well. In cases where speciﬁ c features are available only on the iPad, they will be

pointed out.

NOTE All the examples discussed in this book were written and tested using the

iPhone SDK 4.0. Even though Apple continues to call it the iPhone SDK, it can be

used to develop iPhone, iPod touch, and iPad applications. At the time of writ-

ing (July 2010), Apple continues to use the term “iPhone Simulator” to refer to

the simulator that enables you to simulate both an iPhone and iPad. While every

eﬀ ort has been made to ensure that the screen shots are as current as possible,

the actual screen that you see may diﬀ er when the iPhone SDK is revised.

WHAT THIS BOOK COVERS

This book covers the fundamentals of iPhone and iPad programming using the iPhone SDK. It is

divided into 21 chapters and ﬁ ve appendices.

Chapter 1: Getting Started with iOS 4 Programming covers the various tools found in the iPhone

SDK and explains their uses in iPhone and iPad development.

Chapter 2: Write Your First Hello World! Application gets you started with Xcode and Interface

Builder to build a Hello World application. The focus is on giving you some hands-on practice get-

ting a project up and running quickly. More details on the various project components are covered

in subsequent chapters.

Chapter 3: Views, Outlets, and Actions covers the fundamental concepts of iPhone and iPad pro-

gramming: outlets and actions. You learn how outlets and actions allow your code to interact with

the visual elements in Interface Builder and why they are an integral part of every iPhone and iPad

application. You will also learn about the various UI widgets known as views that make up the user

interface of your application.

Chapter 4: View Controllers discusses the various View Controllers available in the iPhone SDK.

You will learn how to develop different types of applications — View-based, Window-based, Split

View–based, as well as Tab Bar applications.

Chapter 5: Multi-Platform Support for the iPhone and iPad shows how you can port your iPhone

applications to the iPad platform. You will also learn how to create universal applications that will

run on both the iPhone and the iPad.

Chapter 6: Keyboard Inputs shows you how to deal with the virtual keyboard in your iPhone or iPad.

You learn how to hide the keyboard on demand and how to ensure that your views are not blocked

by the keyboard when it is displayed.

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