Preface

When Apple released the first beta of iOS 7 at WWDC 2013, I scoured through the API changes looking for anything out of the ordinary. That’s when I noticed the unexpected addition of new APIs pertaining to barcodes.

At that time, barcodes were little more than visual noise to me, a necessity of modern commerce but of no value to me as a consumer or app developer. Why would Apple devote precious resources to implementing functionality for that?

Several third-party libraries for barcode scanning were available at that time. Some were commercial offerings too expensive for casual use. Others were open source projects requiring a great deal of work to understand or implement in your own apps. By adding support for barcodes within the iOS SDK, Apple made the technology accessible to all developers equally. Apple was sending a message: barcodes are important to us.

This paradigm shift inspired me to learn all I could about barcode technologies. I began to research the barcode types supported by iOS and their capabilities and limitations, and all the new related iOS APIs.

A mere month after WWDC 2013, I was contacted by Manning. They’d found me via my blog (cocoanetics.com) and inquired if I would be interested in writing an iOS book for them. They could not have contacted me at a more perfect moment! I was willing, able, and inspired to write, for more than a year, the book you’re now holding.