iOS 5深度开发指南：利用Core框架与图形、位置、iCloud提升应用

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"《iOS 5 Core Frameworks: Develop and Design》是一本由Shawn Welch撰写的专业书籍，于2011年12月23日出版，由Peachpit Press发行，ISBN-10: 0321803507，ISBN-13: 978-0321803504，是'Develop and Design'系列之一。本书针对iOS 5开发者，深入探讨了如何充分利用平台的强大功能，超越基础工具和API，提升应用程序的性能。书中详细讲解了几个关键的iOS 5核心框架：Core Data用于本地数据存储和多设备、多平台间的无缝同步；通过新的Accounts框架，无缝集成Twitter API，简化了Twitter支持和OAuth过程。Location Services的新特性被用于实现反向地理定位查找和区域通知，使得应用能够更精确地响应用户位置变化。在多媒体方面，作者指导读者如何利用Graphics、Animation、Audio、Video等技术来创建丰富的用户体验，并通过Core Image进行照片处理和分析。此外，书中的章节还涉及Newsstand功能，开发者可以利用这一特性为自己的应用程序创建定期内容，实现推送功能，即使应用不在运行时也能向用户推送新内容。整体来说，本书不仅适合初学者入门，也对有经验的开发者提供了深入理解和实践iOS 5核心技术的指南。作者Shawn Welch以其丰富的开发经验，引导读者在实际项目中操作这些框架，确保读者能够熟练掌握如何在iOS 5环境中工作，包括图形设计、地理位置服务以及云服务（iCloud）的运用。通过这本书，开发者将能够构建出功能强大且用户体验优良的iOS应用，适应不断发展的移动技术市场。"



Everyone seems to have an opinion as

to why their favorite mobile platform is

better than the others. Some prefer iOS, others choose

Android—each platform has its pros and cons. For me, however,

iOS stands above the rest in large part due to its use of powerful

native frameworks.

Sure, frameworks and libraries are not unique to iOS. But the

scope, diversity, power, and simplicity of iOS frameworks is some-

thing I have yet to ﬁnd in other platforms. Frameworks like Core

Animation and Quartz Core make complicated animation eﬀects

simple and eﬃcient in terms of power consumption, memory

management, high frame rate, and so on. Core Location provides

easy access to complicated GPS hardware with only a few lines of

code. In short, these frameworks and others allow developers to

rapidly produce the feature-rich apps users have come to expect.

 CHAPTER  iOS FRAMEWORKS

BEFORE WE BEGIN

When it comes to iOS apps, it doesn’t matter if you’re a new developer whose

crowning achievement is a simple coin-ﬂip app, or an experienced developer who’s

creating the next Flipboard. If you develop apps for iOS you’ve used frameworks,

whether you were aware of it or not.

At a high level, frameworks provide access to low level services through system

APIs. These services can range from the creation and management of simple run-

time objects like arrays, strings, buttons, and text ﬁelds to lower hardware access

of cameras, motion accelerometers, and GPS.

Frameworks are a deﬁning characteristic that make a computer program an

app for iOS. At the end of the day, all iOS apps are based on and executed in an

Objective-C runtime environment. Code in this environment can be written with

a mixture of C, C++, and Objective-C, but to execute a binary in iOS and run an app

on the iPhone or iPad, that app must ultimately interact with iOS frameworks.

Before we begin, you should know my assumptions and expectations about your

background in iOS development. The last thing I want is for you to get half way

through this book and realize it’s not what you were looking for, or even worse, to

reach the end and wish there were more. So let’s take a step back and cover some

prerequisites, followed by a look at my goals for this book.

PREREQUISITES

In iOS there are two frameworks that are absolutely essential, Foundation and UIKit.

This book covers Apple developed frameworks throughout the iOS architecture

including frameworks in the Cocoa Touch layer, Media layer, and Core Services

layer. Because Foundation and UIKit are so essential to even the simplest iOS apps,

I’m assuming a basic understanding of how these frameworks operate. This enables

us to spend more time on the frameworks that will give your app an edge—taking

advantage of the power of iOS to make your app unique.

Because Foundation and UIKit deﬁne the base classes for all objects in iOS, it’s

impossible to develop an app that executes in the iOS runtime without them. For

this reason, when a new iOS project is created in Xcode, these frameworks are

automatically included by default.

:

Because OS was built on the foundation of Mac OS X, many of

the native frameworks carry over with very little loss in performance or

function, giving you the power of a desktop platform on a mobile device.

 CHAPTER  iOS FRAMEWORKS

AUTOMATIC REFERENCE COUNTING

Automatic Reference Counting (ARC) is a new technology available in

Xcode4.2. ARC is actually a compiler feature in Xcode that automatically

handles your retain and release operations for you. Essentially, ARC allows

you to focus on the code while the compiler makes sure your objects stay

around as long as necessary. If you’re new to iOS, this might seem like

a no-brainer. If you’ve developed for iOS in the past, this will come as a

welcome addition.

All of the examples presented in this book will use ARC. If you’re not using

an ARC-enabled project at home when working alongside these examples,

please note that you should balance your retain and release calls on your

own. Additionally, all of the example projects available for download at

iOSCoreFrameworks.com will be ARC enabled. For more information on ARC

visit iOSCoreFrameworks.com/reference#arc.

MY GOALS FOR THIS BOOK

Instagram, Flipboard, foursquare, Facebook, and Twitter—all of these apps on

the iPhone and iPad have at least one thing in common. They all take advantage

of frameworks in iOS. It’s my goal in this book to teach you how to incorporate

common features found in these popular apps by using native iOS frameworks.

Each chapter focuses on a speciﬁc framework, beginning with a broad overview

designed to teach through narrative and short examples. The second half of each

chapter includes longer, more speciﬁc code samples designed to help you with

common use cases.

The primary teaching material in this book will not be code samples. Instead

of presenting you with page after page of speciﬁc code examples for various use-

case scenarios, I use the code as a part of the teaching narrative. My goal is to

explain the fundamentals of the iOS frameworks covered so that you can take the

examples provided, learn from them, and expand them further to more compli-

cated scenarios as needed. It’s my feeling that when reading a book like this one,

the reader should feel like they have a one-on-one with the author, with teaching

and learning throughout.

BEFORE WE BEGIN 

That being said, this book will consistently teach by example, and a large per-

centage of each chapter will focus on code demonstrating the most common uses

of the various frameworks covered. All of the code examples from this book are

available free for download at iOSCoreFrameworks.com in full project form.

By the end of this book you should be able to create your own Instagram-style

photo eﬀects, Flipboard-style page-turn animations, foursquare-like location

awareness, or Twitter-like single sign-on app experience using native frameworks

in iOS. Of course, if I can help you make the next ﬁve-star, multi-million dollar

app and you are generally happier after reading this book, that’s always good, too.

ADDITIONAL MATERIALS ONLINE

While this book is intended to provide an in-depth look at what is made available to you in various iOS

frameworks, there will be times when I cannot dive as deeply as I’d like because of the space alloted for

each chapter. This book covers a lot of material, but if there’s something important I think you should know

that we can’t get to, I’ll use notes to point you to additional reading materials either online at this book’s

website (iOSCoreFrameworks.com), or in Apple’s developer documentation.

Before we go any further, if you feel you don’t have a rm grasp of UIKit and Foundation, or you just

want a simple refresher in iOS, Apple has created some really great Getting Started documents on

developer.apple.com:

J “Cocoa Fundamentals Guide,” iOSCoreFrameworks.com/reference#cocoa

J “iOS Human Interface Guidelines,” iOSCoreFrameworks.com/reference#HIG

J “Your First iOS Application,” iOSCoreFrameworks.com/reference#rst-app

Additionally, feel free to check out other Peachpit books at Peachpit.com, including From Idea to App:

Creating iOS UI, Animations, and Gestures (FromIdeatoApp.com).

: If you get stuck at any point during this book, or need help

taking an example project just a little bit further, feel free to reach

out to me through the contact page at iOSCoreFrameworks.com/contact

or on Twitter @shawnwelch.

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