iOS 4高级编程指南：实例详解iPhone & iPad开发

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《iOS 4 Programming Cookbook》是一本由Vandad Nahavandipoor编写的针对iOS 4高级开发者的实用指南。该书深入探讨了在iPhone、iPad以及iPod Touch上构建高效应用程序所需的高级编程技巧。作为一本技术密集型的教程，它不仅提供了详细的代码示例，还涵盖了iOS 4平台的关键特性，如多任务处理、图形用户界面设计、网络服务集成、核心数据框架（Core Data）以及消息传递机制等。书中内容涵盖了从基础到进阶的主题，包括但不限于： 1. **Swift语言支持**：虽然当时是基于Objective-C编写的，但书中也涉及了一些Swift语言的基础知识，因为iOS 4允许开发者在项目中混合使用两种语言。 2. **App Store最佳实践**：讲解如何优化应用以便通过App Store审核，包括提交策略、用户体验和性能优化。 3. **Multitasking and Background Modes**：介绍了iOS 4中引入的多任务处理能力，以及如何设计应用以充分利用后台执行模式，提升用户体验。 4. **UIKit和Core Graphics**：书中详细解释了如何利用UIKit库创建丰富的用户界面，以及如何使用Core Graphics进行自定义绘图和动画。 5. **Core Data与SQLite**：展示了如何设计和管理应用程序的数据模型，以及如何与SQLite数据库进行高效交互。 6. **网络编程**：包括HTTP通信、JSON和XML解析，以及使用NSURLConnection和NSURLSession进行网络请求的技术。 7. **Push Notifications**：介绍如何实现推送通知，这是当时iPhone和iPad与用户保持联系的重要方式。 8. **iPhone/iPad UI设计差异**：讨论了针对不同屏幕尺寸和设备特性的设计策略，确保跨平台应用的一致性和用户体验。 9. **安全性和隐私保护**：关注iOS 4的安全特性，包括证书管理、用户授权和数据加密等方面。 10. **性能优化**：提供了关于内存管理、线程编程和图形渲染优化的实用建议。《iOS 4 Programming Cookbook》对于希望深入理解并扩展iOS应用功能的开发者来说，是一本不可或缺的参考资料。无论是初次接触iOS开发的开发者，还是希望提升现有技能的专业人士，都能从中受益匪浅。随着iOS不断更新迭代，这本书仍然有价值，因为它提供了一套基础知识和实践经验，可以帮助读者应对iOS平台的持续变化。

Chapter 14, Graphics

Introduces the Core Graphics framework. You will learn how to draw images and

text on a graphics context, grab the contents of a graphics context and save it as

an image, and much more.

Chapter 15, Core Motion

Explains the Core Motion framework, which is new in iOS 4. Using Core Motion,

you will access the accelerometer and the gyroscope on an iOS device. You will

also learn how to detect shakes on a device. Of course, not all iOS devices are

equipped with an accelerometer and a gyroscope, so you will also learn how to

detect the availability of the required hardware.

Additional Resources

From time to time, I refer to official Apple documentation. Some of Apple’s descriptions

are right on the mark, and there is no point in trying to restate them. Throughout this

book, I have listed the most important documents and guides in the official Apple

documentation that every professional iOS developer should read.

For starters, I suggest that you have a look at the “iPhone Human Interface Guidelines”

and the “iPad Human Interface Guidelines.” These two documents will tell you every-

thing you should know about developing engaging and intuitive user interfaces for the

iPhone/iPod and the iPad. Every iOS programmer must read these documents. In fact,

I believe these documents must be read by the product design and development teams

of any company that develops iOS applications.

iPhone Human Interface Guidelines

http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/

mobilehig/Introduction/Introduction.html

iPad Human Interface Guidelines

https://developer.apple.com/library/ios/#documentation/General/Conceptual/iPad

HIG/Introduction/Introduction.html

I also suggest that you skim through the “iOS Application Programming Guide” in the

iOS Reference Library for some tips and advice on how to make great iOS applications:

https://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPho

neOSProgrammingGuide/Introduction/Introduction.html

One of the things you will notice when reading Chapter 11

is the use of block objects.

This book concisely explains block objects, but if you require further details on the

subject, I suggest you read “A Short Practical Guide to Blocks,” available at this URL:

https://developer.apple.com/library/ios/#featuredarticles/Short_Practical_Guide

_Blocks/index.html#//apple_ref/doc/uid/TP40009758

xiv | Preface

code does not require permission. Incorporating a significant amount of example code

from this book into your product’s documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the

title, author, publisher, and ISBN. For example: “iOS 4 Programming Cookbook, by

449-38822-5.”

If you feel your use of code examples falls outside fair use or the permission given here,

feel free to contact us at permissions@oreilly.com.

We’d Like to Hear from You

Every example and code snippet in this book has been tested on the iPhone 4, iPad,

iPhone 3GS, and iPhone/iPad Simulator, but occasionally you may encounter

problems—for example, if you have a different version of the SDK than the version on

which the example code was compiled and tested. The information in this book has

also been verified at each step of the production process. However, mistakes and over-

sights can occur, and we will gratefully receive details of any you find, as well as any

suggestions you would like to make for future editions. You can contact the author and

editors at:

O’Reilly Media, Inc.

1005 Gravenstein Highway North

Sebastopol, CA 95472

(800) 998-9938 (in the United States or Canada)

(707) 829-0515 (international or local)

(707) 829-0104 (fax)

We have a web page for this book, where we list errata, examples, and any additional

information. You can access this page at:

http://oreilly.com/catalog/9781449388225

There is also a companion website to this book where you can see all the examples with

color-highlighted syntax:

http://www.ios4cookbook.com

To comment or ask technical questions about this book, send email to the following

address, mentioning the book’s ISBN number (9781449388225):

bookquestions@oreilly.com

For more information about our books, conferences, Resource Centers, and the

O’Reilly Network, see our website at:

http://www.oreilly.com

xvi | Preface

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Acknowledgments

I have always loved writing and running my programs on computers. I look at pro-

gramming as a way to speak to whatever computer the program runs on. To me,

programming is a way to actually connect with the computer and give it instructions

and listen to what it says in return.

I have been exceptionally lucky to have almost always found the right people to help

me find the right path in whatever journey I’ve started in my life. First and foremost, I

would like to thank my beloved fiancée, Agnieszka Marta Dybowska, for her uncon-

ditional love and support throughout the years and for the many hours she had to

spend without me while I was working on this book. Your strong enthusiasm for writing

and journalism has greatly moved me, and I sincerely hope that one day you will gather

enough material to be able to write your book.

I also want to thank Brian Jepson (whose many hidden talents are yet to be discovered!)

for giving me a chance to work on this book. This book would have been impossible

if it wasn’t for Brian’s consistent urge to improve the outline and the table of contents

that I originally sent him. This reminds me to thank Andy Oram, whom I would like

to call the virtual second writer of this book. Andy’s perfectionism and his undeniable

desire to finely form every single sentence you read in this book are absolutely impres-

sive. I must also thank Sarah Kim and Rachel James for helping me update my profile

page on O’Reilly’s website. I also appreciate Meghan Blanchette’s help in doing the

initial paperwork for this book.

I want to say a big thank you to my technical reviewers, Eric Blair and Alasdair Allan,

for all their helpful insight. Kirk Pattinson, Gary McCarville, and Sushil Shirke are

among the people who have greatly influenced me to become who I am today. Thank

you to Sushil for being a great mentor and colleague and for providing continuous

Preface | xvii

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