iOS开发中的条形码技术：数字与物理世界的桥梁

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"Barcodes with iOS: Bringing together the digital and physical worlds" 本书《Barcodes with iOS》由Oliver Drobnik撰写，专注于向iOS开发者介绍条形码技术。这本书共248页，第一版，英语出版，由Manning Publications于2015年2月6日发布，ISBN-10为161729215X，ISBN-13为9781617292156。购买纸质书可免费获得PDF、Kindle和ePub格式的电子书。书中详细介绍了iOS支持的各种常见条形码格式，如ISBN和UPC代码，并通过实际案例教授如何在应用程序中集成条形码扫描和生成功能。作者将关于Apple框架的信息整合到一处，使得开发者能够快速为现有企业应用添加原生条形码支持或构建新的应用，实现物理世界与数字世界的融合。从iOS 7开始，Apple提供了原生功能来构建扫描、显示和打印条形码的应用，不再需要第三方库。本书适合具备Objective-C和iOS应用开发经验的读者。书中内容包括： 1. 了解iOS支持的所有条形码格式。 2. 使用AV Foundation进行原生条形码扫描。 3. 通过Core Image和BarCodeKit生成各种类型的条形码。 4. 利用AirPrint打印条形码标签。 5. 使用NSURLSession和NSURLProtocol获取条形码的元数据。 6. 结合Core Location和iBeacons利用上下文信息。 7. 将条形码与具体情境相结合。作者Oliver Drobnik是一位专注于iOS和Mac定制开发的独立顾问。书中的章节涵盖了从条形码的基本概念，到使用AV Foundation进行媒体捕获，再到Passbook（苹果的数字钱包）的使用，以及如何生成条形码、获取元数据，以及如何结合地理位置信息等。附录部分则讨论了UPC的历史、GTIN前缀范围和GS1-128应用标识符等。《Barcodes with iOS》是一本全面指导iOS开发者利用条形码技术的书籍，旨在帮助开发者将条形码功能有效地融入到他们的应用程序中，从而连接现实世界与数字世界。

about this book

This book is intended for intermediate-level iOS developers who know their way around

Xcode and have built a few apps already. This allows me to provide instructions in a

terse, tutorial-like style, as readers of my blog, cocoanetics.com, have come to appreci-

ate. By focusing on a more experienced audience, I don’t have to waste your time with

OS development basics that are well covered in other books.

Roadmap

The topic of barcodes serves as the common thread running through the chapters of

this book, but you can dive into specific chapters to learn about particular technolo-

gies. Here’s a quick overview of what you will find in each of the chapters.

Chapter 1 introduces you to the barcode types that are natively supported starting

with i

OS 7. You’ll become a barcode guru and be able to hold your own in any conver-

sation about barcodes, their promises, and their limitations. If you like a good story,

flip to appendix A, which recounts the curious history of the mother of all barcodes:

the

UPC.

Chapter 2 gives you a solid introduction to AV Foundation media capture. You’ll

become familiar with the components of this framework, which we’ll use to build a

camera app.

Chapter 3 introduces you to the metadata detectors for scanning barcodes, build-

ing on the camera preview from chapter 2. At this point, you’ll have a reusable bar-

code scanner that you can employ in all your apps.

ABOUT THIS BOOK

xvi

Chapter 4 deals with Apple’s main reason for pushing forward with barcode sup-

port in iOS: Passbook. You’ll learn how to generate Passbook tickets with Ruby and

how to validate them in an i

OS app without the need for server infrastructure.

Chapter 5 looks at how you can generate your own barcodes for display on devices

and how you can print them to physical media via AirPrint. You’ll learn about the use

of Core Image for generating

QR Codes and BarCodeKit for all kinds of 1D barcodes.

Chapter 6 dives into retrieving metadata for scanned barcodes, in particular how

to use

NSURLSession

for creating a web service wrapper. The second half of this chap-

ter is about creating a custom

NSURLProtocol

and how to stub network requests for

unit testing without the need to call an actual server over the internet.

Chapter 7 then rounds out the book by adding contextual information about the

user who’s scanning barcodes. Core Location and iBeacons let you magically adapt

your app’s

UI to your user’s needs.

Three appendixes provide additional background and other useful information.

Code conventions and downloads

All source code in listings or in text is in a

fixed-width

font

this

to separate it

from ordinary text. Code annotations accompany many of the listings, highlighting

important concepts. In some cases, numbered bullets link to explanations that follow

the listing.

Source code for all working examples in this book is available for download from

the publisher’s website at www.manning.com/Barcodeswithi

OS.

Author Online

Purchase of Barcodes with iOS includes free access to a private web forum run by Man-

ning Publications, where you can make comments about the book, ask technical ques-

tions, and receive help from the author and from other users. To access the forum

and subscribe to it, point your web browser to www.manning.com/Barcodeswithi

OS.

This page provides information on how to get on the forum once you are registered,

what kind of help is available, and the rules of conduct on the forum.

Manning’s commitment to our readers is to provide a venue where a meaningful

dialogue between individual readers and between readers and the author can take

place. It is not a commitment to any specific amount of participation on the part of the

author, whose contribution to the book’s forum remains voluntary (and unpaid). We

suggest you try asking the author some challenging questions, lest his interest stray!

The Author Online forum and the archives of previous discussions will be accessi-

ble from the publisher’s website as long as the book is in print.

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iOS开发中的条形码技术：数字与物理世界的桥梁

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我正在编辑【R】代码，遇到了 【 Barcode file missing. Expecting barcodes.tsv.gz】 ，请帮我检查并改正错误点。我的原始代码如下： 【neonateMI_data <- Read10X(data.dir = "neonateMI")】

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我正在编辑【R】代码，遇到了【 Barcode file missing. Expecting barcodes.tsv.gz】，请帮我检查并改正错误点。我的原始代码如下：【neonateMI_data <- Read10X(data.dir = "neonateMI")】