I have reviewed the sample project for Xamarin.Forms and it seems to work fine.
I have tried to take the code from the sample and get it into my project and it just shows the gray background box with no QR Code.
Ideally, I'd like to setup the barcode control in XAML and bind the Text property to my data source. Here is what I have tried to setup in XAML:
HeightRequest="200" WidthRequest="200" />
I even tried adding a new form to my app, pasting the contents of the sample page and doing some minor tweaks to it so it would run but I get the same results again. Not sure if maybe there is something in the SamplePage that is setting up something I need or not.
Anyone out there know what I should try next?