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BEGINNING iOS GAME DEVELOPMENT

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

PART I THE TOOLS TO GET STARTED

CHAPTER 1 Games on iOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CHAPTER 2 The Xcode Programming Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

CHAPTER 3 The C Programming Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

CHAPTER 4 The Objective-C Programming Language . . . . . . . . . . . . . . . . . . . . . . . . . 95

CHAPTER 5 The Cocoa Foundation Framework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .137

PART II GAME BUILDING BLOCKS

CHAPTER 6 Drawing with UIKit and Core Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . 173

CHAPTER 7 Responding to User Interaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

CHAPTER 8 Animating Your Graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251

CHAPTER 9 Making Noise with iOS Audio APIs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

CHAPTER 10 Building a Networked Game with GameKit . . . . . . . . . . . . . . . . . . . . . . . 333

APPENDIX Answers to Exercises . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385

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BEGINNING

iOS Game Development

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BEGINNING

iOS Game Development

Patrick Alessi

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Beginning iOS Game Development

Published by

John Wiley & Sons, Inc.

10475 Crosspoint Boulevard

Indianapolis, IN 46256

www.wiley.com

Copyright © 2012 by Patrick Alessi

Published by John Wiley & Sons, Inc., Indianapolis, Indiana

Published simultaneously in Canada

ISBN: 978-1-118-10732-4

ISBN: 978-1-118-22408-3 (ebk)

ISBN: 978-1-118-23161-6 (ebk)

ISBN: 978-1-118-26231-3 (ebk)

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For Morgan — I hope that watching me take on and

conquer a diffi cult task inspires you to do the same.

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ABOUT THE AUTHOR

PATRICK ALESSI has been fascinated with writing computer programs since he fi rst saw his name

fl ash across a terminal in 1980. Since then, he has written software using every language and hard￾ware platform that he could get his hands on, including a brief and painful foray into Fortran on a

VAX system during his engineering education. Patrick holds a B.S. degree in Civil Engineering from

Rutgers University and an M.S. in Computer Science from Stevens Institute of Technology.

Professionally, Patrick has built data-centric applications for clients ranging from small business

databases to large-scale systems for the United States Air Force. He has also developed a variety of

real-time systems, graphics intensive desktop applications, and games. Currently, he is focused on

developing connected applications and games for mobile devices such as the iPhone and iPad.

When he can back away from the computer, Patrick enjoys photography, traveling, gaming on his

Xbox and doing just about anything with his family. You can follow him on Twitter at @pwalessi

and read his blog at iphonedevsphere.blogspot.com.

ABOUT THE TECHNICAL EDITOR

MICHAEL GILBERT is a long-time systems programmer for various engineering fi rms. He got his start

developing games for the Atari ST, and was a frequent contributing editor for STart magazine. Over

the years, he has developed gaming software on the PC and Mac for clients worldwide. He’s also an

expert Flash ActionScript programmer and has produced a popular Internet gaming environment

called HigherGames; you can check it out at www.highergames.com. He now enjoys developing

games for the iPhone and iPad, and currently has four games in the AppStore (Woridgo, Jumpin’

Java, Kings Battlefi eld, and Set Pro HD). In his spare time, he enjoys trying to defeat his wife,

Janeen, in a friendly game of Scrabble. You can follow him on Twitter at @mija711.

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ACQUISITIONS EDITOR

Mary James

PROJECT EDITOR

Brian MacDonald

TECHNICAL EDITOR

Michael Gilbert

PRODUCTION EDITOR

Rebecca Anderson

COPY EDITOR

Mike La Bonne

EDITORIAL MANAGER

Mary Beth Wakefi eld

FREELANCER EDITORIAL MANAGER

Rosemarie Graham

ASSOCIATE DIRECTOR OF MARKETING

David Mayhew

MARKETING MANAGER

Ashley Zurcher

BUSINESS MANAGER

Amy Knies

PRODUCTION MANAGER

Tim Tate

VICE PRESIDENT AND EXECUTIVE GROUP

PUBLISHER

Richard Swadley

VICE PRESIDENT AND EXECUTIVE PUBLISHER

Neil Edde

ASSOCIATE PUBLISHER

Jim Minatel

PROJECT COORDINATOR, COVER

Katie Crocker

PROOFREADER

Nancy Carrasco

INDEXER

Robert Swanson

COVER DESIGNER

Ryan Sneed

COVER IMAGE

© Adeline Lim / iStockPhoto

CREDITS

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ACKNOWLEDGMENTS

I WOULD LIKE TO take this opportunity to thank everyone who made this book possible. Mary

James, my acquisitions editor, encouraged me to get back to writing and fostered this book through

the acquisitions process. My project editor, Brian MacDonald, was instrumental in turning my

stream of consciousness into a cohesive work. Mike Gilbert, my technical editor, gave up valuable

app development and gaming time to review my work. I would also like to thank all of the other edi￾torial and production staff that put many hours into this project to help get it to print.

The most important people in the writing process are my wife, Cheryl, and my stepdaughter,

Morgan. They pick up the slack for me when I can’t keep up with my other duties, ensuring that life

goes on as normal. They also put up with my fi ts, general crankiness, and lack of time for fun fam￾ily activities as I worked my way through writing this book. Your patience with me is astounding.

Finally, I’d like to thank my parents for molding me into the semi-mature adult that I’ve turned into.

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