iOS游戏编程入门指南：打造App Store爆款

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"《Learning iOS Game Programming》是一本深入探索iOS游戏开发的权威指南，由众多开发者共同打造，让读者在iPad、iPhone和iPod touch设备上体验游戏设计与实现的全过程。该书不仅适合初学者入门游戏开发，也得到了业内专家的高度评价。作者Michael Daley以其独特的教学风格，即使在学习过程中也在不断提升自己，展示了深厚的理论基础和实践能力。书中详尽的代码示例不仅易于理解，还能帮助读者避免在官方文档和论坛中寻找答案时浪费时间，直接步入实战。 Tom Bradley，作为一名软件架构师和TBXML的设计者，称赞这本书是游戏开发世界的优秀入门教材，对游戏设计的各个方面进行了全面阐述。Sebastien Cardoso认为这是一本教你如何为iPhone编写出惊艳游戏的宝典，甚至预示了可能成为App Store的下一个热门作品。 Pablo Gomez Basanta，作为ShiftingMind的创始人，更是肯定了书中解决问题的轻松方法以及最终产出的完整游戏项目，使得《Learning iOS Game Programming》成为他读过的最佳教程之一。这本书不仅传授知识，还激发了读者的热情，使学习游戏编程成为一种愉快且高效的过程。《Learning iOS Game Programming》是一本结合了实用技巧、深入剖析和实战案例的宝贵资源，无论是对于希望踏入iOS游戏开发领域的新人，还是经验丰富的开发者提升技能，都是一份不可或缺的学习资料。"

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Processing Taps  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
Accelerometer Events  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298
13
The Game Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
Game Interface Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
OpenGL ES Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
Rendering the Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
Defining Button Bounds  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
Handling Touches  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304
Handling Transitions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308
OpenGL ES Orientation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308
UIKit Interfaces  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312
Creating the Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312
Wiring Up the Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
UIKit Orientation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318
Showing and Hiding a UIKit Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 320
Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
14
Game Objects and Entities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
Game Objects and Entities Project  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
Game Objects  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
AbstractObject Class  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327
EnergyObject Class  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
Game Entities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338
AbstractEntity Class  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339
Artificial Intelligence  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
Player Entity Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
Saving a Game Object or Entity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352
Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
15
Collision Detection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
Introduction to Collision Detection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
Collision Pruning  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
Frame-Based Versus Time-Based  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
Axis-Aligned Bounding Boxes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360
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Contents
 

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Detecting Collisions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361
Collision Map  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362
Entity-to-Map Collision Detection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
Entity-to-Entity Collision Detection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368
16
Putting It All Together  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
The “Camera”  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
Saving the Game State and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
Saving Game State  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
Loading Game State  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
Saving Game Settings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375
Loading Game Settings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Saving High Scores  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 377
Adding a Score  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
Saving High Scores  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380
Loading High Scores  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 381
Performance and Tuning  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382
Using Instruments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383
Leaks Instrument  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384
Using the OpenGL ES Instrument  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
Compiling for Thumb  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389
Beta Testing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390
Multiple Device Types  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391
Feedback  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392
Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392
Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
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Contents
 

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Acknowledgments

Writing this book has been an amazing journey, and it’s only through the efforts of

many other people that you are reading this today.Without these people, I don’t believe

the book would have even been published, let alone become the valuable resource I

believe it to be. For this reason, I would like to acknowledge those people who have

supported me on this journey:

First of all, I’d like to thank my editor at Addison-Wesley, Chuck Toporek, and his

faithful sidekick/editorial assistant, Romny French. Chuck stumbled upon the

video tutorials on my blog and encouraged me to write this book based on what

he saw there. Along the way, Romny helped keep things moving, chased/support-

ed me in getting my tax information in place so I could get paid, and helped us

deliver the book to production.Without their support, guidance, and encourage-

ment, I would never have been able to make the leap from game development

blogger to author.

John Bloomfield is a professional web designer and is responsible for the design

and administration of the 71Squared.com blog.Without his great work on the

blog, Chuck would never have seen my tutorials, and the opportunity to write this

book may never have arisen. John is also my oldest and closest friend, and even

though he is now living on the other side of the world in Australia, it didn’t stop

him from supporting and contributing to this project.

Tom Bradley, a good friend, talented developer, and creator of TBXML,

spent

many hours working with me, even into the early hours of the morning, helping

me track down bugs and improve performance.Tom’s support helped me through

some sticky moments in the development of Sir Lamorak’s Quest and was instru-

mental in getting the game finished on time.

Ryan Sumo is a freelance video game artist residing in Manila,The Philippines. He

created all the artwork used in Sir Lamorak’s Quest that gives the game its retro

look. He is a true professional and a pleasure to work with. His rapid delivery of

art and great feedback and suggestions really helped give the game its great look.

If you ever run into Ryan in Manila and show him a copy of this book, he is

sure to buy you a drink. Examples of Ryan’s work can be found at

ryansumo.carbonmade.com.

Vince Webb is an award-winning composer currently enrolled on an undergradu-

ate music course in London and is the creator of the music and sound effects used

in Sir Lamorak’s Quest. His ability to create an atmosphere with his music really

took Sir Lamorak’s Quest to a new level.Vince is currently working on a number of

TBXML: www.tbxml.co.uk

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