iPhone SDK应用开发揭秘：App Store掘金全攻略

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《App Store 掘金》是一本由 Jonathan Zdziarski 所著的专业书籍，专门探讨在 iPhone SDK 上进行应用程序开发的相关知识。该书于2009年首次出版，版权归属于 Jonathan Zdziarski，享有所有权利。本书面向广大开发者，旨在帮助读者深入了解如何利用苹果提供的 iPhone SDK 进行高效、创新的应用程序开发。《App Store 掘金》的内容涵盖了从基础入门到深入实践的全方位教程，包括但不限于以下知识点： 1. **iPhone SDK概览**：介绍了Apple的iOS开发环境，包括Xcode（集成开发环境）和各种工具的使用，让读者对开发流程有全面了解。 2. **应用设计原则**：书中可能涉及UI/UX设计的最佳实践，以及如何创建吸引用户、易用且高效的界面。 3. **API与框架**：讲解了Core Data、UIKit、MapKit等关键iOS框架的使用方法，以及如何利用它们构建功能丰富的应用程序。 4. **安全与隐私**：强调了遵守苹果的隐私政策和数据安全规范，确保应用程序合规性。 5. **性能优化**：讨论了如何提高应用程序的运行速度、内存管理以及减少耗电，以提升用户体验。 6. **发布与上架流程**：指南中包含了如何提交应用至App Store、审核流程、定价策略和营销技巧等内容。 7. **案例分析与实战项目**：书中可能会包含一些实际项目的开发过程，通过实例展示理论知识在实践中的应用。 8. **最新技术和趋势**：鉴于出版时间，书中可能涵盖了当时苹果平台的最新技术更新，如Swift语言、iOS 10及以上版本特性等。作为一本Nutshell Handbook系列的作品，这本书可能采用了简洁明快的语言风格，深入浅出地阐述复杂概念，适合初级到中级的iOS开发者阅读。此外，由于O'Reilly Media出版社的品质保证，该书不仅提供了纸质版，还提供在线版本，方便随时随地学习。《App Store 掘金》是一本实用的指南，对于希望在移动应用市场取得成功的开发者来说，无论是技术提升还是商业策略的学习，都具有很高的价值。

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Foreword

As a longtime participant in the iPhone hacking community, I have often been asked

just what I think about the iPhone SDK. I’ll take a moment to reward those of you who

have purchased this book with an answer. In short, Apple’s iPhone SDK adds some

very nice high-level functionality to clean up an otherwise hideous mess. Deep under-

neath the SDK’s comfy pillows rests a very disorganized and poorly designed set of

frameworks, but some of that ugly was also very functional in areas where the SDK is

not. The SDK is certainly good enough to write a high-quality, functional application

for the AppStore (if it weren’t, I wouldn’t be writing about it). The interfaces provided

by the SDK are written well enough for most good developers to design good software,

but most people are unaware of the functionality that isn’t available to them. For those

who cut their teeth in the open source world, the iPhone SDK is still a point of

contention.

If you’re unfamiliar with the politics surrounding the SDK, there are two sets of devel-

oper interfaces: those provided by the SDK, and those that Apple uses. While there is

some overlap between the two, I wrote about many classes and frameworks you’ve

never heard of in my book iPhone Open Application Development (O’Reilly). You’ve

never heard of them because they are not available in the SDK. Many of us in the early

iPhone hacking community discovered them by breaking into the iPhone’s operating

system directly. Throughout many weeks of dumping symbol tables, classes, and ex-

perimenting by trial and error, we mapped out the genome for the iPhone’s user inter-

face kit as well as many other frameworks, including many that are now private. It is

these low-level APIs that developers use when building iPhone software with the open

source tool chain, and the same low-level APIs that we found many of Apple’s appli-

cations taking advantage of to do things the SDK didn’t quite allow for.

These low-level APIs are what give open tool chain developers an edge over SDK de-

velopers, and in my opinion, offer a better development framework than Apple’s SDK.

Many of the frameworks on the device have been quietly privatized, making their func-

tionality unavailable to AppStore developers. Not coincidentally, much of this

functionality appears to be what is crucial for building applications that Apple might

consider to be competitive with their own preloaded software. Of these, the greatest

offenses include restricting the Core Surface framework, which would have given SDK

developers the ability to render raw pixels directly to a screen layer and incorporate the

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use of graphics accelerators. Without this framework available, you’ll have a difficult

time squeezing performance out of applications that require 2D rendering, such as

custom movie players, video recorders, or high performance 2D games like my free

Nintendo emulator. This is also a key framework needed in order to write applications

such as Flash or Java™ with any degree of performance. Another set of APIs you’ll find

missing is the ability to interface with iTunes music. This is why the SDK version of

Nate True’s Tap Tap Revolution no longer picks songs from your iTunes library, and

why you’ll only find cool music applications like SynchStep (which plays music to the

rhythm of your steps) in a third-party repository. Even simple functionality, such as

the ability to run in the background or display status bar icons, exists only when using

APIs that are restricted from the AppStore. Needless to say, the open source iPhone

compiler lets you do many things that the SDK cannot, which some would speculate

is designed to ensure Apple will forever have the competitive edge in the iPhone soft-

ware market.

On the other side of things, the SDK offers something that open source was never much

good at accruing: large wads of cash. Developers seem to be able to swallow their

distaste for Apple’s policies after considering the obscene amount of money there is to

be had from an audience as large as that of iTunes. The AppStore financially rewards

innovators who are willing to drink the Kool-Aid. The potential for revenue provided

by the AppStore gives developers a significant advantage over the open development

community, even if your application does turn out slightly crippled.

From a solely technical perspective, the open source compiler can build applications

using either the SDK interfaces or the low-level “private” interfaces, depending on

which set of headers you care to use. The same is true of Xcode: the private, undocu-

mented interfaces can be easily imported into your project by simply pointing the SDK

at the right headers. This gives you four possible combinations for developing

applications.

What it really comes down to is this: if you are looking to deploy applications in the

AppStore, you must play by Apple’s rules. Apple will not accept an application that

uses private interfaces or frameworks. Apple has reportedly even rejected flashlight

applications that overstepped their bounds and had the nerve to try to adjust the dis-

play’s brightness on their own. If you’re a commercial developer or designing software

to deploy on your enterprise, there really is only one viable path for you, and that’s to

use the sanctioned APIs documented in this book. If, however, you’re reading this book

as an open source enthusiast, and consider your code to be more of an art form, you

may be more interested in writing software as it was intended to be written—without

shackles and sandboxes. In this case, I recommend you consider using not only the

APIs you’ll find in this book, but to further expand your knowledge into the many

undocumented APIs and frameworks available. The open source community was the

first to build a public compiler and over-the-air, online community software repository

for the iPhone, and it welcomes beautiful, full-featured applications.

xvi | Foreword

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