掌握Cocos2D：iPhone与iPad游戏开发实战指南

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"《Learn iPhone and iPad Cocos2D Game Development》是一本专为iOS开发者打造的游戏开发指南，由Steffen Itterheim编著。这本书深入讲解了如何利用Cocos2D框架在iPhone和iPad上创建激动人心的游戏。Cocos2D是一款广泛应用于移动游戏开发的开源框架，特别适合想要涉足iOS平台游戏制作的开发者。本书不仅提供了理论知识，还包含了丰富的源代码示例，使读者能够通过实践快速掌握Cocos2D的基础和进阶技术。书中涵盖了Cocos2D的基本概念、游戏对象管理、精灵（Sprite）、场景（Scene）和动作（Actions）的使用，以及粒子系统（Particle Systems）和物理引擎的集成等内容。此外，作者还指导读者如何构建游戏逻辑，优化性能，并且适应不同尺寸的屏幕，确保游戏在iPhone和iPad上的良好表现。版权方面，所有内容受Steffen Itterheim的保护，未经许可不得复制或传播。该书提供两种版本，纸质版的ISBN-13为978-1-4302-3303-9，电子版的ISBN-13为978-1-4302-3304-6。印刷和装订都在美国完成。书中可能会引用并展示一些商标名称、标志和图像，这些使用仅限于编辑性目的，旨在帮助商标所有者，无意侵犯其权益。读者将通过学习这本书了解到如何在实际项目中恰当地运用这些商标和知识产权。对于想要提升iOS游戏开发技能的读者来说，《Learn iPhone and iPad Cocos2D Game Development》是一本极具价值的参考资料，无论是初次接触Cocos2D还是希望深入理解其高级特性的开发者，都能从中获得宝贵的经验和实践指导。通过跟随书中的实例，开发者们可以迅速提升自己的iOS游戏开发能力，为iPhone和iPad用户带来更多创新和乐趣的游戏作品。"

xiv

Acknowledgments

This is the part of the book that make me a little anxious. I don’t want to forget anyone who has

been instrumental and helpful in creating this book, yet I know I can’t mention each and every

one of you. If you’re not mentioned here, that doesn’t mean I’m not thankful for your

contribution! Give me a pen and I’ll scribble your name right here in your copy of the book, and

I’ll sincerely apologize for not having mentioned you here in the first place.

My first thanks go to you, dear reader. Without you, this book wouldn’t make any sense. Without

knowing that you might read and enjoy this book, and hopefully learn from it, I probably

wouldn’t even have considered writing it in the first place. I’ve received valuable insights and

requests from my blog readers and other people I’ve met or mailed during the course of this

book. Thank you all!

Now follow the people who helped get this book written, in the order I met them.

My first thanks go to Jack Nutting, who put the idea of writing a book on cocos2d in my head in

the first place. I’m grateful that he did not sugarcoat how much work goes into writing a book, so I

wasn’t unprepared.

Clay Andres I have to thank for being such a kind person, whose input on my chapter proposals

were invaluable and to the point. He helped me form the idea of what the book was to become,

and he’s generally a delightful person to talk to. Clay, I hope that storm did not flood your house.

Many thanks to Kelly Moritz, the coordinating editor, who though incredibly busy always found

the time and patience to answer my questions and follow up on my requests. When chaos

ensued, she was the one to put everything back in order and made it happen.

Lots and lots of feedback and suggestions I received from Brian MacDonald, the development

editor for the book, and Boon Chew, the technical reviewer. They made me go to even greater

lengths. Brian helped me understand many of the intricacies of writing a book while Boon

pointed out a lot of technical inaccuracies and additional explanations needed. Many thanks to

both of you

Many thanks go to the copy editors, Sharon Terdeman and Damon Larson. Without you, the

book’s text would be rife with syntax errors and compiler warnings, to put it in programmer’s

terms. Sharon, when you said that my chapters are always easy work, I actually didn’t believe you

even though I know you’re the expert. And Damon, thanks for putting on the reader’s hat and

suggesting all those confusing paragraphs to be rephrased.

I also wish to thank Bernie Watkins, who managed the Alpha Book feedback and my contracts.

Thanks also to Chris Guillebeau for being an outstanding inspirational blogger and role model.

Of course my friends and family all took some part in writing this book, through both feedback

and plain-and-simple patience with putting up with my writing spree. Thank you!

Preface

In May 2009 I made first contact. For the first time in my life, I was subjected to the Mac OS

platform and started learning Xcode, Objective-C, and cocos2d. Even for an experienced

developer, it was a struggle. It was at that time that I realized that cocos2d was good, but it lacked

documentation, tutorials, and how-to articles—especially when compared with the other

technologies I was learning at the time.

Fast forward a year to May 2010. I had completed four cocos2d projects. My Objective-C and

cocos2d had become fluent. It pained me to see how other developers were still struggling with

the same basic issues and were falling victim to the same misconceptions that I did about a year

earlier. The cocos2d documentation was still severely lacking.

I knew that other developers using cocos2d were having great success attracting readers to their

blogs by writing tutorials and sharing what they know about cocos2d. To date, most of the

cocos2d documentation is actively being created in a decentralized fashion by other developers. I

saw a need for a web site to channel all of the information that’s spread over so many different

web sites.

I created the www.learn-cocos2d.com web site to share what I knew about cocos2d and game

development, to write tutorials and FAQs, and to redirect readers interested in cocos2d to all the

important sources of information. In turn, I would be selling cocos2d-related products, hoping it

might one day bring me close to the ultimate goal of becoming financially independent. The

business model has been proven to work by many shining examples. And I enjoy helping others,

having been the go-to guy in all companies I’ve worked for. I knew I could make the web site a

win for everyone. I was excited.

From day one, the web site was a success—beyond my wildest imaginations. Then, within 24

hours of taking the web site live, Jack Nutting asked me if I had considered writing a cocos2d

book. The rest is history, and the result is the book you’re reading right now.

I took everything I had in mind for the web site and put it in the book. But that alone would have

amounted to maybe a quarter of the book, at most. I hope the four months I spent writing the

book full-time paid off by being able to provide an unprecedented level of detail on how cocos2d

works, and how to work with cocos2d.

I learned a lot in the process, including a lot of things I didn’t even expect not to know, weird as

that may sound. And I wish nothing more than for you to learn a great deal about cocos2d and

game development from this book.

Chapter

Introduction

Did you ever imagine yourself writing a computer game and being able to make money

selling it? With Apple’s iTunes App Store and the accompanying mobile devices iPhone,

iPod Touch, and iPad, it’s now easier than ever. Of course, that doesn’t mean that it’s

easy—there’s still a lot to learn about game development and programming games. But

you are reading this book, so I believe you’ve already made up your mind to take this

journey. And you’ve chosen one of the most interesting game engines to work with:

cocos2d for iPhone.

Developers using cocos2d have a huge variety of backgrounds. Some, like me, have

been professional game developers for years and even decades. Others are just starting

to learn programming for iOS devices or are freshly venturing into the exciting field of

game development. Whatever your background might be, I’m sure you’ll get something

out of this book.

There’s one thing that unites all cocos2d developers: we love games, and we love

creating and programming them. This book will pay homage to that, yet won’t forget

about the tools that will help ease the development process. Most of all, you’ll be

making games that matter along the way, and you’ll see how this knowledge is applied

in real game development.

You see, I get bored by books that spend all their pages teaching me how to make yet

another dull Asteroids clone using some specific game-programming API. What’s more

important, I think, are game programming concepts and tools, the things you take with

you even as APIs or your personal programming preferences change. I’ve literally

amassed hundreds of programming and game development books over 20 years. The

books I value the most to this day are those who went beyond the technology and

taught me why certain things are designed and programmed the way they are. This

book will focus not just on working game code but also why it works and which

tradeoffs to consider.

I would like you to learn how to write games that matter, games that are popular on the

App Store and relevant to players. I’ll walk you through the ideas and technical concepts

behind these games in this book, and, of course, how cocos2d and Objective-C make

these games tick. You’ll find that the source code that comes with the book is enriched

CHAPTER 1: Introduction

with a lot of comments, which should help you navigate and understand all the nooks

and crannies of the code.

Learning from someone else’s source code with a guide to help focus on what’s

important is what works best for me whenever I’m learning something new—and I like to

think it will work great for you too. And since you can base your own games on the

book’s source code, I’m looking forward to playing your games in the near future! Don’t

forget to let me know about them! You can reach me at steffen@learn-cocos2d.com or

visit my website dedicated to learning cocos2d at www.learn-cocos2d.com.

Why Use cocos2d for iPhone?

When game developers look for a game engine, they first evaluate their options. I think

cocos2d is a great choice for a lot of developers, for many reasons.

It’s Free

First of all, it is free. It doesn’t cost you a dime to work with it. You are allowed to create

both free and commercial iPhone, iPod, and iPad Apps. You don’t have to pay royalties

either. Seriously, no strings attached.

Since cocos2d is basically a one-man product created by Ricardo Quesada you might

want to consider making a donation to help further development of cocos2d, or consider

buying one of his commercial source code projects. Both donations and projects are

available on the cocos2d Store web site: http://www.cocos2d-iphone.org/store.

It’s Open Source

The next good reason to use cocos2d is that it’s open source. This means there’s no

black box preventing you from learning from the game engine code, or making changes

to it where necessary. You can download cocos2d from www.cocos2d-iphone.org/

download.

It’s Objective, See?

Furthermore, the code is written in Objective-C, Apple’s native programming language

for writing iPhone Apps. It’s the same language used by the iPhone SDK, which makes it

easier to understand Apple’s documentation and implement iPhone SDK functionality.

A lot of other useful APIs like Facebook Connect and OpenFeint are also written in

Objective-C, so it makes it easier to integrate those, too.

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掌握Cocos2D：iPhone与iPad游戏开发实战指南

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