Download Barcodes with iOS by Oliver Drobnik PDF

By Oliver Drobnik

Summary

Barcodes with iOS is the 1st and simply e-book that comprehensively addresses barcode expertise for the iOS developer. It bargains an creation to favourite codecs, comparable to ISBN and UPC codes, and offers real-world examples that train you ways to combine code scanning and iteration into your apps. This publication consolidates information regarding appropriate Apple frameworks in a single position so that you can speedy upload local barcode help on your present company apps or begin construction new apps that support compile the actual and electronic worlds.

Purchase of the print booklet features a unfastened booklet in PDF, Kindle, and ePub codecs from Manning Publications.

About the Technology

Barcodes are a common strategy to tune and proportion details, showing on every little thing from cereal bins to buy home windows. beginning with iOS 7, Apple has further local good points for development apps that experiment, demonstrate, and print barcodes, casting off the necessity for third-party libraries.

About the Book

Barcodes with iOS teaches you ways to successfully use barcodes on your iOS apps. You'll grasp Apple's new barcode frameworks once you discover real-world examples that combine code scanning and new release and metadata retrieval into your apps. alongside the way in which, you'll choose up a number of top practices for bringing jointly the actual and electronic worlds.

This e-book is written for readers with a operating wisdom of Objective-C and iOS app development.

What's Inside

Learn approximately all barcode codecs supported via iOS
Native barcode scanning with AV Foundation
Using center snapshot and BarCodeKit to provide quite a lot of barcodes
Printing to sheets and labels with AirPrint
Retrieving metadata for items with NSURLSession and NSURLProtocol
Harnessing context details from center situation and iBeacons

About the Author

Oliver Drobnik is an self reliant advisor focusing on customized iOS and Mac improvement.

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Additional info for Barcodes with iOS

Example text

13 Barcode symbologies in iOS As one of the oldest barcode types in use today, Code 25 has a few flaws. Besides being limited to encoding only even numbers of digits, it doesn’t have marker bars to indicate 12345678901234 to a reading device where the bars start and where they end. 10 An example of reads. Also, there’s no built-in error check- an Interleaved 2 of 5 code ing or correction. Despite those flaws, Code 25 was chosen by GS1 to represent 14-digit GTINs. The predominant use is for marking shipping boxes that contain multiple identical products.

You can prefix them with an underscore to visually mark them as internal: 24 CHAPTER 2 Current capture device Still image output Media capture with AV Foundation @implementation DTCameraPreviewController { AVCaptureDevice *_camera; AVCaptureDeviceInput *_videoInput; AVCaptureStillImageOutput *_imageOutput; AVCaptureSession *_captureSession; } Video input for the device Capture session manages connections between inputs and outputs With this setup in place, you’re ready to dive into media capture with AV Foundation.

Because there are always 14 digits to be represented, the even-numbers-only limitation is a non-issue. A check digit adds protection for incorrect scans. As an additional measure for battling incomplete scans, so-called bearer bars were added. Those are meant to abort the scan if the scan line doesn’t cross all bars, for example, if the scan angle is too steep. For printing on labels, only the horizontal bearer bars (above and below) are required by the standard. For printing on corrugate boxes, vertical bearer bars (left and right) are also recommended to even out the printing plate pressure.

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