iOS7编程基础：Objective-C, Xcode和Cocoa入门

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"iOS7编程基础" 本书《iOS7编程基础》由Matt Neuburg撰写，是针对初学者的最新iOS开发教程，全面介绍了在iOS 7环境下进行应用程序开发所需的基本知识和技术。书中深入探讨了Objective-C语言、Xcode集成开发环境（IDE）以及Cocoa基础。 1. Objective-C：Objective-C是iOS应用开发的主要编程语言，它基于C语言并扩展了面向对象的功能。在本书中，读者将学习到Objective-C的关键概念，包括类、对象、消息传递、协议和分类。此外，还将了解如何使用Objective-C的语法编写可读性强、易于维护的代码。 2. Xcode：作为Apple官方推荐的开发工具，Xcode提供了编写、调试和测试iOS应用的全套工具。书中会详细介绍如何创建新的项目，使用Interface Builder设计用户界面，以及利用Xcode的调试器进行问题定位。读者还将学习如何使用版本控制系统Git来管理代码。 3. Cocoa基础：Cocoa是iOS开发的核心框架，包含了实现各种功能的库和API。书中将介绍UIKit框架，它是构建iOS用户界面的主要工具。还会讲解数据模型、视图和控制器（MVC）设计模式，以及如何利用Core Data进行数据持久化。 4. iOS7特性和变化：针对iOS 7，书中会特别强调其界面设计的变化、新引入的特性，如控制中心、多任务处理和动态壁纸等。同时，也会涵盖与新系统相关的API和编程指南，帮助开发者适应这一重大更新。 5. 实战演练：本书通过一系列逐步指导的实例，让读者亲手实践iOS应用的开发过程。这些实例涵盖了从简单的“Hello, World”程序到更复杂的交互式应用，帮助读者巩固理论知识，并提升实际操作技能。 6. 软件工程实践：除了技术细节，本书还会讨论软件开发的最佳实践，如代码组织、测试策略和性能优化，以培养良好的编程习惯和工程思维。 7. 错误处理和调试：书中包含专门章节讲述如何发现和修复程序中的错误，以及使用Xcode的调试工具进行高效调试。《iOS7编程基础》是一本全面且深入的入门教程，适合对iOS开发感兴趣的新手，通过本书的学习，读者能够掌握开发高质量iOS应用所需的基础知识和技能。

Acknowledgments

My thanks go first and foremost to the people at O’Reilly Media who have made writing

a book so delightfully easy: Rachel Roumeliotis, Sarah Schneider, Kristen Brown, and

Adam Witwer come particularly to mind. And let’s not forget my first and long-standing

editor, Brian Jepson, who had nothing whatever to do with this edition, but whose

influence is present throughout.

I have been saved from many embarrassing errors by the sharp and dedicated eyes of

Peter Olsen, a long-time reader who faithfully posts notes to the book’s online Errata

page, apparently just because that’s the kind of amazing and dedicated person he is.

As in the past, I have been greatly aided by some fantastic software, whose excellences

I have appreciated at every moment of the process of writing this book. I should like to

mention, in particular:

• git (http://git-scm.com)

• SourceTree (http://www.sourcetreeapp.com)

•

TextMate (http://macromates.com)

• AsciiDoc (http://www.methods.co.nz/asciidoc)

• BBEdit (http://barebones.com/products/bbedit/)

• Snapz Pro X (http://www.ambrosiasw.com)

• GraphicConverter (http://www.lemkesoft.com)

•

OmniGraffle (http://www.omnigroup.com)

The book was typed and edited entirely on my faithful Unicomp Model M keyboard

(http://pckeyboard.com), without which I could never have done so much writing over

so long a period so painlessly. For more about my physical work environment, see http://

matt.neuburg.usesthis.com.

From the Programming iOS 4 Preface

The popularity of the iPhone, with its largely free or very inexpensive apps, and the

subsequent popularity of the iPad, have brought and will continue to bring into the fold

many new programmers who see programming for these devices as worthwhile and

doable, even though they may not have felt the same way about OS X. Apple’s own annual

WWDC developer conventions have reflected this trend, with their emphasis shifted

from OS X to iOS instruction.

The widespread eagerness to program iOS, however, though delightful on the one hand,

has also fostered a certain tendency to try to run without first learning to walk. iOS gives

the programmer mighty powers that can seem as limitless as imagination itself, but it

also has fundamentals. I often see questions online from programmers who are evidently

xiv | Preface

deep into the creation of some interesting app, but who are stymied in a way that reveals

quite clearly that they are unfamiliar with the basics of the very world in which they are

so happily cavorting.

It is this state of affairs that has motivated me to write this book, which is intended to

ground the reader in the fundamentals of iOS. I love Cocoa and have long wished to

write about it, but it is iOS and its popularity that has given me a proximate excuse to

do so. Here I have attempted to marshal and expound, in what I hope is a pedagogically

helpful and instructive yet ruthlessly Euclidean and logical order, the principles on

which sound iOS programming rests, including a good basic knowledge of Objective-

C (starting with C itself) and the nature of object-oriented programming, advice on the

use of the tools, the full story on how Cocoa objects are instantiated, referred to, put in

communication with one another, and managed over their lifetimes, and a survey of

the primary interface widgets and other common tasks. My hope, as with my previous

books, is that you will both read this book cover to cover (learning something new often

enough to keep you turning the pages) and keep it by you as a handy reference.

This book is not intended to disparage Apple’s own documentation and example

projects. They are wonderful resources and have become more wonderful as time goes

on. I have depended heavily on them in the preparation of this book. But I also find that

they don’t fulfill the same function as a reasoned, ordered presentation of the facts. The

online documentation must make assumptions as to how much you already know; it

can’t guarantee that you’ll approach it in a given order. And online documentation is

more suitable to reference than to instruction. A fully written example, no matter how

well commented, is difficult to follow; it demonstrates, but it does not teach.

A book, on the other hand, has numbered chapters and sequential pages; I can assume

you know C before you know Objective-C for the simple reason that Chapter 1 precedes

Chapter 2. And along with facts, I also bring to the table a degree of experience, which

I try to communicate to you. Throughout this book you’ll see me referring to “common

beginner mistakes”; in most cases, these are mistakes that I have made myself, in addition

to seeing others make them. I try to tell you what the pitfalls are because I assume that,

in the course of things, you will otherwise fall into them just as naturally as I did as I

was learning. You’ll also see me construct many examples piece by piece or extract and

explain just one tiny portion of a larger app. It is not a massive finished program that

teaches programming, but an exposition of the thought process that developed that

program. It is this thought process, more than anything else, that I hope you will gain

from reading this book.

Conventions Used in This Book

The following typographical conventions are used in this book:

Italic

Indicates new terms, URLs, email addresses, filenames, and file extensions.

Preface | xv

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