2013年iOS 6编程指南：Matt Neuburg第三版精要

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"《编程iOS 6（第三版，2013年）》是编程大师Matt Neuburg所著的一本技术书籍。该书是针对iOS 6平台的编程指南，是2013年出版的第三个版本，专为开发者提供深入理解和实践iOS 6开发所需的知识与技巧。原书是英文版，强调实用性与直接性，适合iOS开发者和想要进一步了解苹果操作系统的技术人员。本书的主要内容包括但不限于：iOS 6的新特性和API介绍，如新功能、框架改进以及性能优化；Objective-C和Swift语言的最佳实践，帮助读者掌握这两种在iOS开发中常用的编程语言；界面设计和用户体验的构建，包括故事板（Storyboard）、Auto Layout等；以及如何利用Core Data进行数据管理，以及网络编程、多线程处理、图形与多媒体等方面的知识。版权方面，这本书享有所有权利，由O'Reilly Media Inc.出版，提供了印刷版和在线版本供读者选择。此外，书中还包含了一些版权信息，例如Nutshell Handbook、Nutshell Handbook logo、O'Reilly logo等都是O'Reilly Media的注册商标。作者对第一版的修订历史也有所记录，2013年2月27日为首次发布，并提供了详细的错误和更新信息链接。封面设计由Randy Comer负责，内部设计则由David Futato操刀，插图则出自作者之手。该书的编辑、生产编辑和校对团队也列在了作者后面，显示了O'Reilly出版社对于质量控制的严谨态度。整体而言，《Programming iOS 6（第三版）》是一本全面且实用的iOS开发参考书籍，无论是初次接触iOS开发的开发者还是经验丰富的技术专家，都能从中受益匪浅。"

Interruptions 913

Routing Changes 915

Audio Player 916

Remote Control of Your Sound 918

Playing Sound in the Background 921

Further Topics in Sound 923

28.

Video. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 925

MPMoviePlayerController 926

MPMoviePlayerViewController 932

UIVideoEditorController 934

Introduction to AV Foundation Video 936

29.

Music Library. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 943

Exploring the Music Library 943

The Music Player 948

The Music Picker 954

30.

Photo Library and Image Capture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 957

UIImagePickerController 957

Choosing from the Photo Library 958

Using the Camera 962

Image Capture With AV Foundation 966

The Assets Library Framework 969

31.

Address Book. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 973

Address Book Database 973

Address Book Interface 977

ABPeoplePickerNavigationController 978

ABPersonViewController 980

ABNewPersonViewController 981

ABUnknownPersonViewController 982

32.

Calendar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 985

Calendar Database 985

Calendar Interface 995

33.

Mail and Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1003

Mail Message 1003

Text Message 1005

xiv | Table of Contents

Twitter Post 1006

34. Maps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1007

Displaying a Map 1007

Annotations 1010

Overlays 1017

Map Kit and Current Location 1024

Geocoding 1025

Communicating With the Maps App 1027

35. Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1029

Location 1030

Heading 1035

Acceleration and Attitude 1036

Shake Events 1037

Raw Acceleration 1038

Gyroscope 1042

Part VII. Final Topics

36.

Persistent Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1051

The Sandbox 1052

Basic File Operations 1053

Saving and Reading Files 1054

User Defaults 1056

File Sharing 1058

Document Types 1059

Handing Off a Document 1060

The Document Architecture 1064

iCloud 1068

XML 1070

SQLite 1077

Core Data 1078

Image File Formats 1084

37.

Basic Networking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1087

HTTP Requests 1087

Bonjour 1096

Push Notifications 1098

Table of Contents | xv

Aut lego vel scribo; doceo scrutorve sophian.

—Sedulius Scottus

Preface

With the advent of version 2 of the iPhone system, Apple proved they could do a re‐

markable thing — adapt their existing Cocoa computer application programming

framework to make applications for a touch-based device with limited memory and

speed and a dauntingly tiny display. The resulting Cocoa Touch framework, in fact,

turned out to be in many ways better than the original Cocoa.

A programming framework has a kind of personality, an overall flavor that provides an

insight into the goals and mindset of those who created it. When I first encountered

Cocoa Touch, my assessment of its personality was: “Wow, the people who wrote this

are really clever!” On the one hand, the number of built-in interface widgets was severely

and deliberately limited; on the other hand, the power and flexibility of some of those

widgets, especially such things as UITableView, was greatly enhanced over their Mac

OS X counterparts. Even more important, Apple created a particularly brilliant way

(UIViewController) to help the programmer make entire blocks of interface come and

go and supplant one another in a controlled, hierarchical manner, thus allowing that

tiny iPhone display to unfold virtually into multiple interface worlds within a single app

without the user becoming lost or confused.

Even more impressive, Apple took the opportunity to recreate and rationalize Cocoa

from the ground up as Cocoa Touch. Cocoa itself is very old, having begun life as

NeXTStep before Mac OS X even existed. It has grown by accretion and with a certain

conservatism in order to maintain something like backward compatibility. With Cocoa

Touch, on the other hand, Apple had the opportunity to throw out the baby with the

bath water, and they seized this opportunity with both hands.

So, although Cocoa Touch is conceptually based on Mac OS X Cocoa, it is very clearly

not Mac OS X Cocoa, nor is it limited or defined by Mac OS X Cocoa. It’s an independent

creature, a leaner, meaner, smarter Cocoa. I could praise Cocoa Touch’s deliberate use

of systematization (and its healthy respect for Occam’s Razor) through numerous ex‐

xvii

amples. Where Mac OS X’s animation layers are glommed onto views as a kind of af‐

terthought, a Cocoa Touch view always has an animation layer counterpart. Memory

management policies, such as how top-level objects are managed when a nib loads, are

simplified and clarified. And so on.

At the same time, Cocoa Touch is still a form of Cocoa. It still requires a knowledge of

Objective-C. It is not a scripting language; it is certainly not aimed at nonprogrammers,

like HyperCard’s HyperTalk or Apple’s AppleScript. It is still huge and complicated. In

fact, it’s rather difficult.

The popularity of the iPhone, with its largely free or very inexpensive apps, and the

subsequent popularity of the iPad, have brought and will continue to bring into the fold

many new programmers who see programming for these devices as worthwhile and

doable, even though they may not have felt the same way about Mac OS X. Apple’s own

annual WWDC developer conventions have reflected this trend, with their emphasis

shifted from Mac OS X to iOS instruction.

The widespread eagerness to program iOS, however, though delightful on the one hand,

has also fostered a certain tendency to try to run without first learning to walk. iOS gives

the programmer mighty powers that can seem as limitless as imagination itself, but it

also has fundamentals. I often see questions online from programmers who are evidently

deep into the creation of some interesting app, but who are stymied in a way that reveals

quite clearly that they are unfamiliar with the basics of the very world in which they are

so happily cavorting.

It is this state of affairs that has motivated me to write this book, which is intended to

ground the reader in the fundamentals of iOS. I love Cocoa and have long wished to

write about it, but it is iOS and its popularity that has given me a proximate excuse to

do so. Indeed, my working title was “Fundamentals of Cocoa Touch Programming.”

Here I have attempted to marshal and expound, in what I hope is a pedagogically helpful

and instructive yet ruthlessly Euclidean and logical order, the principles on which sound

iOS programming rests, including a good basic knowledge of Objective-C (starting with

C itself) and the nature of object-oriented programming, advice on the use of the tools,

the full story on how Cocoa objects are instantiated, referred to, put in communication

with one another, and managed over their lifetimes, and a survey of the primary interface

widgets and other common tasks. My hope, as with my previous books, is that you will

both read this book cover to cover (learning something new often enough to keep you

turning the pages) and keep it by you as a handy reference.

This book is not intended to disparage Apple’s own documentation and example

projects. They are wonderful resources and have become more wonderful as time goes

on. I have depended heavily on them in the preparation of this book. But I also find that

they don’t fulfill the same function as a reasoned, ordered presentation of the facts. The

online documentation must make assumptions as to how much you already know; it

can’t guarantee that you’ll approach it in a given order. And online documentation is

xviii | Preface

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