ZXing scanner with Xamarin Forms FreshMVVM

SearchQrPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="MyApp.Pages.SearchQrPage"
             xmlns:zxing="clr-namespace:ZXing.Net.Mobile.Forms;assembly=ZXing.Net.Mobile.Forms">
    <ContentPage.Content>
        <Grid>
            <zxing:ZXingScannerView x:Name="scannerView" />
            <zxing:ZXingDefaultOverlay x:Name="scannerOverlay"
                                       TopText="Hold your phone up to the QR code"
                                       BottomText="Scanning will happen automatically"
                                       ShowFlashButton="True"/>
        </Grid>
    </ContentPage.Content>
</ContentPage>

SearchQrPage.xaml.cs

using MyApp.PageModels;
using System;
using System.Collections.Generic;
using Xamarin.Forms;

namespace MyApp.Pages
{
    public partial class SearchQrPage : ContentPage
    {

        public SearchQrPage()
        {
            InitializeComponent();

            scannerView.Options = new ZXing.Mobile.MobileBarcodeScanningOptions
            {
                PossibleFormats =
                new List<ZXing.BarcodeFormat>
                        {
                            ZXing.BarcodeFormat.QR_CODE
                        }
            };

            scannerView.OnScanResult += ScannerView_OnScanResult;

            scannerOverlay.FlashButtonClicked += ScannerOverlay_FlashButtonClicked;
        }

        protected override void OnAppearing()
        {
            scannerView.IsScanning = true;

            base.OnAppearing();
        }

        private void ScannerOverlay_FlashButtonClicked(Button sender, EventArgs e)
        {
            scannerView.ToggleTorch();
        }

        private void ScannerView_OnScanResult(ZXing.Result result)
        {
            var model = this.BindingContext as SearchQrPageModel;
            if (model == null)
                return;

            scannerView.IsScanning = false;

            if (model.ScanResultCommand.CanExecute(result))
                model.ScanResultCommand.Execute(result);

        }
    }
}

SearchQrPageModel.cs

using FreshMvvm;
using MyApp.Infrastructure.Helpers;
using MyApp.Pages;
using System;
using System.ComponentModel;
using Xamarin.Forms;

namespace MyApp.PageModels
{
    public class SearchQrPageModel : FreshBasePageModel, INotifyPropertyChanged
    {
        private bool NavigatingAway = false;

        private Command<object> _scanResultCommand;
        public Command<object> ScanResultCommand
        {
            get
            {
                return _scanResultCommand ?? (_scanResultCommand = new Command<object>(ScanResultAction));
            }
        }

        protected override void ViewIsAppearing(object sender, EventArgs e)
        {
            NavigatingAway = false;

            base.ViewIsAppearing(sender, e);
        }

        private void ScanResultAction(object obj)
        {
            // Prevent multiple event triggers from triggering the navigation multiple times
            if (NavigatingAway)
                return;            
            
            NavigatingAway = true;

            var result = obj as ZXing.Result;
            var format = result?.BarcodeFormat.ToString() ?? string.Empty;
            var value = result?.Text ?? string.Empty;

            Device.BeginInvokeOnMainThread(async () =>
                {
                    // Navigate to a page based on value
                }
            );
        }
    }
}