Barcodes-with-iOS.pdf下载

When Apple released the first beta of i OS 7 at WWDC 2013 , I scoured through the API changes looking for anything out of the ordinary. That’s when I noticed the unex- pected addition of new API s pertaining to barcodes. At that time, barcodes were little more than visual noise to me, a necessity of mod- ern 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 i OS SDK , Apple made the technology acces- sible 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 limi- tations, and all the new related i OS API s. 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 i OS 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. June 2014 marked the 40-year anniversary of the first barcode being scanned at a point of sale. In other words, barcodes are a nearly ubiquitous, mature technology. The UPC you’ll find on all products sold in your supermarket was just the beginning. PREFACE xii Just look at any Apple product box. You’ll find several barcodes on the stickers offer- ing additional information such as the device’s serial number. Since October 2013, all iPhones can be used to scan barcodes. Together with always-on mobile internet and built-in device sensors, this enables a new breed of product-centric apps that weren’t feasible before. After reading this book, you’ll be able to build the exciting new apps that are bringing together the digital and physical worlds.