zXing XAMARINE doesn't scan if you reOpen the page

Riccardo Daria

i use this code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace UBIK_Beauty_app
{
    public partial class PageScanner : ContentPage
    {
        public PageScanner()
        {
            InitializeComponent();
        }
        void ZXingScannerView_OnScanResult(ZXing.Result result)
        {
            Device.BeginInvokeOnMainThread(() =>
            {
                scanResultText.Text = result.Text + " (type: " + result.BarcodeFormat.ToString() + ")";
                Application.Current.MainPage.Navigation.PopAsync();
            });
        }
        private void AvviaScanner(object sender, EventArgs args)
        {
            //fotoCamera.IsVisible = true;
           // fotoCamera.IsScanning = true;
        }
    }
}

it works only the first time you open the page, if you,

after you get the barCode by scanning, go to previuos page and then reOpen this page the camera doesn'TSCAN!!!!!!

Why don't you tray and help me????

THANKS

3 Replies

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Riccardo Daria3y ago
No anyone can help me?????
0
Riccardo Daria3y ago
this page: (PageScanner) is called from a previous page, and the method avviaScanner isn't usefull not is used!!

when i call this page for the first time the scanner works, after the scnning, the app need to go back at the prevous page, and from this previous page you call another time the PageScanner for a new scan, but the second time the scann doesn't work!!!!!

I hope i gave you the correct scenarious

Thanks
0
Mohamed Azarudeen Z3y ago
Hi Ric

To resolve this issue, you can try implementing the following changes:
1. Remove the line Application.Current.MainPage.Navigation.PopAsync(); from the ZXingScannerView_OnScanResult method. This line is causing the page to be popped from the navigation stack, which might be the reason the camera is not scanning again when you navigate back to the page.
2. Modify the AvviaScanner method to reset the IsScanning property of the ZXingScannerView to true before navigating to the scanner page. This will ensure that the camera starts scanning again when you return to the page. Here's an example of how you can modify the method:
- private void AvviaScanner(object sender, EventArgs args) { fotoCamera.IsScanning = true; Navigation.PushAsync(new PageScanner()); }
  
  With these changes, the camera should resume scanning when you navigate back to the page, allowing you to scan barcodes multiple times without any issues.
  
  I hope this helps! Let me know if you have any further questions.
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