iOS游戏开发指南：iPhone Game Development

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"iPhone Game Development" 是一本针对iOS游戏开发的英文原版书籍，适合初学者和有经验的开发者阅读。本书由Paul Zirkle和Joe Hogue撰写，旨在引导读者进入iPhone游戏开发的世界。O'Reilly Media是一家知名的出版商，专注于技术和专业领域的图书，其标志性的"动物书"封面和在线服务Safari Books Online在行业内广为人知。书中可能涵盖了以下关键知识点： 1. **Swift编程语言**：iOS游戏开发通常使用Swift作为主要编程语言，因此本书可能会介绍Swift的基础知识，包括变量、控制流、函数和类等。 2. **UIKit框架**：作为iOS应用程序开发的核心，UIKit框架包含用于构建用户界面的工具和类。书中可能讲解了如何利用UIKit创建游戏界面和交互。 3. **SpriteKit框架**：苹果提供的专门用于2D游戏开发的框架，它包含动画、物理模拟、粒子系统等功能。学习如何使用SpriteKit创建游戏场景和角色是游戏开发的重要部分。 4. **SceneKit和Metal**：对于3D游戏开发，SceneKit提供了一种高级API，而Metal则是一个低级图形库，能更直接地控制硬件性能。书里可能涉及这两者的基本用法。 5. **Game Center**：苹果的游戏中心允许玩家在多设备间同步游戏进度、排行榜和挑战。开发者需要了解如何集成Game Center以增强游戏体验。 6. **In-App购买和广告**：如何通过应用内购买（IAP）和广告实现游戏的商业化，可能是书中讨论的话题。 7. **物理引擎和碰撞检测**：游戏中的真实感往往依赖于物理引擎，包括重力、碰撞和其他物理行为。书中可能介绍如何实现这些效果。 8. **音频和视频处理**：游戏的音效和背景音乐是提升用户体验的关键。书可能涵盖AVFoundation框架的使用，以及如何处理音频和视频资源。 9. **性能优化**：iOS设备的性能有限，优化代码以降低内存占用和提高帧率至关重要。作者可能分享了一些最佳实践和技巧。 10. **测试和发布**：最后，书籍可能会教导读者如何进行测试（包括真机测试和模拟器测试）、提交App Store审核，并最终将游戏推向市场。此外，书中还可能包含实际项目案例分析，以帮助读者将理论知识应用于实践中。同时，作者们的经验分享和问题解决策略也是读者获取实用技能的重要来源。通过阅读此书，读者可以全面了解并掌握iPhone游戏开发的各个环节，从基础概念到高级技术。

not download Xcode separately because it is included within the SDK download

package (and the version of Xcode that comes with the SDK may be newer than

what is otherwise available).

5. Once downloaded, install the SDK, which will make Xcode and Interface Builder

accessible to you in the /Developer/Applications folder on your hard drive (you can

also activate Spotlight and search for Xcode and Interface Builder to launch either

application quickly).

The free developer account will allow you to build applications and run them in a

simulator on your Mac. However, to load your application onto a phone, you will also

need to sign up for the paid developer program. This requires a small annual fee, so

even if you are a private developer, it won’t hurt your wallet too much:

1. Go to http://developer.apple.com/iphone/program/apply.html.

2. You will have two options: Standard Program and Enterprise Program. If you are

writing games for the general public, you probably do not want the Enterprise

Program. If you read closely, you will notice the Enterprise Program is actually for

creating applications that only you and your company will use internally. If you

plan to create games that will be sold via the App Store, rest assured that the

Standard Program is the correct choice for you.

3. Select Enroll Now and log in if necessary.

4. You now have another choice: enroll as an individual or as a company. If you

choose Individual, you will not be able to add other programmers or quality as-

surance members to your account, which is necessary to distribute your application

to others during the development and testing process. However, if you select Com-

pany, you will be required to provide detailed information about your company.

5. Continue through the website, selecting the appropriate information, until you

arrive at a screen that says “Thank you for submitting your enrollment.” Now you

must wait for an email from Apple (which may take on the order of a month to

arrive).

Signing up for the paid developer program will also give you access to

beta releases of future versions of the iPhone OS and SDK, but only

during the times at which Apple chooses to make them available.

It is good to get your paid developer account enrollment going as soon as possible so

that it will be available when you actually need it.

Application Bundles

When you build an application using Xcode, the end result is called an application

bundle. In Mac OS X and the iPhone, an application bundle is a special type of directory

2 | Chapter 1: Introduction to the iPhone

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that holds an executable file and the resources needed to run it. This includes an icon

to represent the application, files with special information about the application, and

any images or sounds the application uses.

In the Finder, an application bundle simply appears as its application

icon; right-click or Ctrl-click on it and select View Package Contents

from the menu to see what’s inside.

Although you can’t do this on the iPhone, you can find iPhone appli-

cations in the iPhone Simulator. If you have the iPhone SDK installed,

you can use Spotlight to search for the MobileSafari.app file. Show this

file in the Finder (don’t try to run it on your Mac), and view its package

contents (some of which appears in the following list).

A typical iPhone application bundle might have the following structure:

Executable

(Required.) This is the compiled code executable; it will typically have the same

name as your application. In MobileSafari.app, this is the file named MobileSafari.

Info.plist

(Required.) This is a collection of properties, in key-value pair form, that specifies

important information about your application. Notable properties listed here are

the display name of your application, the version number, and a unique ID number.

These files use a binary format that can’t be read in a text editor, but you can use

the Property List Editor located in /Developer/Applications/Utilities to view them.

icon.png

(Required.) This is a 57 × 57 pixel icon used to represent your application on the

iPhone’s home screen. Glossy button effects will be added on top of this image

automatically, so it should be flat-colored.

Various resources

(Optional.) All common resource files, such as images, sounds, and binary data,

used by your application will be placed in the same folder as the executable. The

only subfolders present in an iPhone application bundle are for localized resources.

Localization folders

(Optional.) If your application supports multiple languages, you may add sub-

folders to the bundle, which contain resources that cater to individual languages.

The folder names will have a language name or an ISO language abbreviation fol-

lowed by “.lproj”; for example, English.lproj, French.lproj, German.lproj, and

uk.lproj would each contain resources specific to English, French, German, and

UK English languages, respectively.

Settings.bundle

(Optional.) You will create this file if you want your application to provide user

preference options in the Settings application that comes with the iPhone.

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Icon-Settings.png

(Optional.) If you added a Settings.bundle file, this image is used to represent the

application in the Settings application. The image should be 29 × 29 pixels. How-

ever, if you do not add this image, the Icon.png image will be scaled and used

automatically.

MainWindow.nib

(Optional.) Created by the Interface Builder application, MainWindow.nib con-

tains code and resources necessary to draw your application as it starts up.

More .nib files can be loaded after this one, but it will always be the first in memory.

Default.png

(Optional.) This image is displayed as the application is loading the Main-

Window.nib file. It should be full screen, which is 480 × 320 pixels on the iPhone.

If this image is close to what the user will see when the application is finished

loading, the load process will appear to take less time.

iTunesArtwork

(Optional.) If you are distributing the application outside the App Store, this art-

work is used to display your application when loading onto a handset using iTunes.

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