入门指南：iOS游戏编程打造iPhone游戏

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"Learning IOS Game Programming iPhone Game" 本书《Learning iOS Game Programming》是针对苹果游戏开发的入门指南，尤其适合初学者。它深入浅出地介绍了在iPad、iPhone和iPod touch设备上进行游戏设计和实现的各个方面。作者通过自身的开发经验和对游戏编程的深入理解，为读者提供了一个全面的学习路径。书中内容可能包括但不限于以下知识点： 1. **Swift编程基础**：由于iOS游戏开发通常使用Swift语言，书中会介绍Swift的基本语法、数据类型、控制流、函数和类等概念，让初学者能够快速掌握编程基础。 2. **UIKit和SpriteKit框架**：iOS游戏开发常用的两大框架，UIKit用于构建用户界面，而SpriteKit则专门用于2D游戏开发。书中会详细讲解这两个框架的使用方法和功能特性。 3. **游戏设计原理**：从游戏概念到实际开发，书里可能会涵盖游戏设计的基本原则，如游戏规则、关卡设计、角色设定、用户体验等，帮助读者理解游戏设计的整体流程。 4. **图形和动画**：讲解如何使用OpenGL ES或Metal进行图形渲染，以及如何创建流畅的游戏动画效果，包括精灵（sprites）、粒子系统和物理模拟等。 5. **音频与多媒体**：介绍如何集成音频文件和实现游戏音效，以及如何处理视频和图像资源，提升游戏的沉浸感。 6. **触摸和手势识别**：详细阐述如何利用iOS设备的触控特性，实现玩家与游戏的互动，如滑动、点击、捏合等手势。 7. **游戏性能优化**：教授如何优化代码，减少内存占用，提高游戏帧率，确保游戏在不同设备上的流畅运行。 8. **In-App购买和广告集成**：介绍如何通过内购系统和广告平台实现游戏的盈利模式，包括广告的插入和管理，以及内购商品的设置和验证。 9. **测试与发布**：指导读者如何使用Xcode进行调试，准备App Store的提交流程，以及如何处理审核过程中的问题。 10. **持续学习和社区支持**：推荐其他学习资源，鼓励读者参与开发者社区，分享经验，解决问题。通过阅读这本书，读者不仅可以掌握iOS游戏开发的基础技术，还能学习到一个完整游戏项目从构思到发布的全过程。作者Michael Daley的教学热情和实践经验使得这本书成为了一本优秀的自学教材，有望帮助读者快速入门并创造出自己的App Store热门游戏。

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Processing Taps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294

Accelerometer Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298

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

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

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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Detecting Collisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361

Collision Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362

Entity-to-Map Collision Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

Entity-to-Entity Collision Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368

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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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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