iOS Barcodes：融合数字与实体世界的桥梁

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《Barcodes with iOS》是一本由Oliver Drobnik编著的专业书籍，它聚焦于将数字世界与物理世界紧密连接起来，尤其是在iOS平台上的条形码技术应用。本书深入探讨了如何在iOS设备上实现对条形码的扫描、识别以及与数字信息的交互，从而推动了物联网(IoT)和移动应用程序中的数据交换和自动化流程。在当今的信息化社会，条形码已经成为商业和个人生活中不可或缺的一部分，它们广泛用于库存管理、商品追踪、支付验证以及客户服务等多个领域。在iOS平台上，Apple的集成库如Core NFC和AVFoundation等提供了强大的工具，使得开发人员能够轻松地在iPhone和iPad上实现扫码功能，无论是为了增强用户体验，还是为了构建高效的企业解决方案。书中可能涵盖了以下知识点： 1. **条形码基础知识**：解释不同类型的条形码（如EAN-13、UPC-A、Code 128等）的工作原理，以及它们在iOS中的表示方式和读取机制。 2. **iOS SDK和框架**：详细介绍了如何利用iOS提供的API，如`AVFoundation`和`Core NFC`来实现条形码扫描功能，包括设置扫码器、解析条形码数据以及处理扫描结果。 3. **用户界面设计**：讨论如何设计易于使用的扫码界面，包括提示信息、错误处理和成功提示，以及与用户交互的最佳实践。 4. **条形码与云端服务集成**：展示了如何通过条形码数据将实物与在线数据库同步，如产品信息查询、库存更新或订单确认等。 5. **数据安全与隐私**：强调在处理条形码扫描过程中保护用户隐私的重要性，如遵循GDPR等数据保护法规，并确保数据传输的安全性。 6. **实际案例研究**：书中可能会提供几个实际应用示例，如零售店的库存管理、物流追踪、电子票务系统或者二维码支付应用等，以展示条形码在iOS中的具体应用场景。 7. **性能优化与调试**：分享在开发过程中遇到的挑战和解决策略，比如处理复杂的条形码、低光环境下的识别问题以及提高扫描成功率的方法。 8. **未来趋势与扩展**：展望条形码技术在iOS生态系统中的发展趋势，如二维码的普及、AR/VR与条形码的结合以及物联网(IoT)的发展对条形码的影响。《Barcodes with iOS》是一本实用的指南，帮助读者理解和掌握如何利用iOS平台的条形码功能进行创新应用，是iOS开发者和产品经理必备的参考资料。

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.

www.it-ebooks.info

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.

www.it-ebooks.info

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