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Construct a Barcode Generator Utilizing SwiftUI


I lately obtained a query from a good friend concerning barcode era utilizing Swift. The CoreImage framework supplies handy built-in APIs for creating numerous sorts of barcodes, together with QR codes. On this tutorial, we’ll discover how one can leverage SwiftUI and these highly effective APIs to develop your very personal barcode generator.

Let’s first check out the ultimate end result. It’s a really elementary barcode era app with easy UIs. If you enter textual content into the designated discipline, the app immediately generates the corresponding barcode utilizing the Code 128 format, which is used for alphanumeric or numeric-only barcodes.

swiftui-barcode-generator

Creating the Barcode Generator

Assuming you could have created a brand new SwiftUI mission in Xcode, open the ContentView.swift file. Begin by importing the required bundle for utilizing the filters:

Subsequent, we create a BarcodeGenerator struct for producing the barcode:

To create the barcode, we declare two variables: the context and the Code 128 generator. When you discover the CIFilter class, you’ll uncover different code turbines such because the QR code generator and the Aztec code generator. Nevertheless, for this demonstration, we’ll give attention to utilizing the Code 128 barcode generator.

The generateBarcode methodology accepts a string enter and returns the generated barcode picture. Throughout the methodology, we first initialize the code128BarcodeGenerator and assign the enter textual content to its message property. Because the message property expects Knowledge, we convert the enter textual content to Knowledge. Subsequently, we retrieve the generated barcode picture from the outputImage property of the generator.

Because the ensuing picture is of kind CIImage, we make the most of the createCGImage methodology of the context to transform it to a CGImage. We then proceed with further steps to transform it into an Picture.

Constructing the Person Interface

Now that we’ve completed constructing the barcode generator, let’s transfer on to creating the consumer interface for displaying the barcode picture.

First, declare the next properties in ContentView for the enter textual content and the barcode generator:

For the consumer interface, let’s preserve it easy and lay out all of the views in a VStack like this:

On the display screen, we’ve a textual content discipline that captures consumer enter. In direction of the underside of the display screen, the app shows the generated barcode. In case there isn’t a consumer enter, we present a default picture with the caption “Unknown information.”

That’s it! It is best to now be capable of take a look at the app within the preview pane. Merely enter any textual content within the textual content discipline, and the app will mechanically generate the barcode on the fly.

swiftui-barcode-generator-code-128

Abstract

This tutorial supplies a complete information on constructing a barcode generator utilizing the CoreImage framework and SwiftUI. Whereas the main focus is on making a Code 128 barcode, you may simply modify the code to help a number of sorts of barcodes together with QR codes.


Founding father of AppCoda. Creator of a number of iOS programming books together with Starting iOS Programming with Swift and Mastering SwiftUI. iOS App Developer and Blogger. Observe me at Fb, Twitter and Google+.



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