Скачать или смотреть Implementing ZXing QR/Barcode Scanning in Xamarin MVVM

Discover how to seamlessly integrate `ZXing QR/Barcode scanning` into your Xamarin.Forms application using the MVVM pattern with practical examples and tips.
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This video is based on the question https://stackoverflow.com/q/70446251/ asked by the user 'Carljohn Lopez' ( https://stackoverflow.com/u/17669842/ ) and on the answer https://stackoverflow.com/a/70447137/ provided by the user 'Juan Sturla' ( https://stackoverflow.com/u/16918183/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Implementing ZXing QR/Barcode Scanning in Xamarin MVVM: A Step-by-Step Guide

As a beginner in Xamarin.Forms, you may find yourself facing challenges when trying to implement complex functionalities like QR and barcode scanning. If you want to create an application that opens a scanner form, captures scan results, and displays the results in a label using the MVVM pattern, you are in the right place! In this guide, we will walk you through the entire process of setting up ZXing QR/Barcode scanning in a Xamarin.Forms application using the MVVM approach—ensuring a clean separation of concerns in your code.

Problem Overview

Let’s say you have a requirement where a user clicks a button, which opens up a scanner view to scan QR or barcodes. Once scanned, the result should then be displayed in the application’s UI. While this sounds simple, integrating ZXing for scanning into the MVVM architecture requires understanding how to bind the scanning result back to the view model correctly.

Setting Up Your Project

Before we dive into the implementation, ensure that your Xamarin.Forms project is set up and includes the necessary ZXing.Net.Mobile library. You can install it via NuGet:

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XAML View Setup

Now, let’s start by setting up your XAML view. Here’s how you want to configure the scanner view and the label for displaying the results:

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Key Points:

Label: Displays the result of the scanned QR or barcode.

ZXingScannerView: The key component for scanning which we will configure to handle scan results.

View Model Configuration

Next, let’s set up the ViewModel to manage the scanning logic. This ViewModel will hold the scanned result and possess the necessary commands for scanning:

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Key Points:

Property Binding: Ensure that CodigoQr is a string to hold the result as text.

ScanCommand: Represents an asynchronous command to handle scan results efficiently.

Code-Behind Logic

To connect the ZXingScannerView with the ViewModel, we will need to handle the result in the code-behind file. Here's how to implement the event handler that captures the scan result:

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Key Points:

Event Handler: This method is called when the scanner successfully detects a QR or barcode. It retrieves the scanned text and updates the ViewModel.

Conclusion

Combining ZXing with the MVVM pattern allows you to create clean, maintainable code while enhancing user experience through QR and barcode scanning functionalities. Remember to test your implementation thoroughly to ensure everything works as expected! With the steps provided above, you should have a solid start on building applications integrating barcode scanning seamlessly.

Feel free to explore additional functionalities and customize your scanner settings to meet your specific needs. Happy coding!