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Once the scanning is performed, the customer is making use PushAsync method to navigate to a different page where the scanned text is to be shown. However, the page appears completely blank.
In our application I have one screen where I can scan a barcode, after a successful scan I then navigate to another screen. Upon navigating to this other screen the screen does not render correctly, the app bar is shown, properties are read from the view model but the pivot and other controls are not rendered, therefore rendering an empty screen.
Is there any way I can update the UI after the navigation has occurred?
This is using 126.96.36.199 of the ZXing.Net.Mobile library and version 188.8.131.52 of XF.
Steps to Reproduce:
- Run the App on Device
- Press the Scan Button
- Scan any BarCode (https://upload.wikimedia.org/wikipedia/commons/5/5d/UPC-A-036000291452.png)
- After scanning, the page is navigated to Page2
Here the screen appears to be blank. Nothing is rendered!
Note: Pressing NoScan just updated the ViewModel with text NoScan. However, this text does render properly.
Microsoft Visual Studio Enterprise 2015
Version 14.0.25123.00 Update 2
Microsoft .NET Framework
Installed Version: Enterprise
Architecture and Modeling Tools 00322-80000-00000-AA004
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Microsoft Visual C# 2015
Visual C++ 2015 00322-80000-00000-AA004
Microsoft Visual C++ 2015
Windows Phone SDK 8.0 - ENU 00322-80000-00000-AA004
Windows Phone SDK 8.0 - ENU
Application Insights Tools for Visual Studio Package 5.208.60602.2
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ASP.NET Web Frameworks and Tools 2012.2 4.1.41102.0
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ASP.NET Web Frameworks and Tools 2013 5.2.40314.0
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Azure App Service Tools v2.8.1 14.0.11123.0
Azure App Service Tools v2.8.1
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Microsoft .NET Core Tools (Preview 1) 14.1.20512.0
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SQL Server Data Tools 14.0.60311.1
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Visual Studio Tools for Universal Windows Apps 14.0.25219.00
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Xamarin 184.108.40.206 (a532c82)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 220.127.116.11 (804c6cb)
Visual Studio extension to enable development for Xamarin.Android.
Xamarin.iOS 18.104.22.1689 (3afb4af)
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Anubhav - have you tried using Device.BeginInvokeOnMainThread to ensure that your UI operations are happening on the UI thread?
We haven't heard back from you so we're going to close this issue for now. But if you're able to reproduce this issue on the latest version please reopen the bug and attach the reproduction.