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When using a bluetooth barcode scanner that acts like a keyboard to the OS, i.e. the scanner converts the barcode to text and spits out a string, it works as expected on iOS and Android in that the Completed event is fired but on UWP the Completed event is not consistently fired.
I can not personally reproduce this as I do not have a barcode scanner of the type used by the reporting customer, but to test to see if it is a Forms issue or not, I created a simple native UWP app with a TextBox and handled the TextChanged and SelectionChanged events, the same events Forms handles for a UWP TextBox, and the issue still occurred with their bluetooth scanner on the native UWP app, so does not seem to be an issue in Xamarin Forms.
The reporting customer was able to work around this in the native UWP app I created by handling the KeyDown event of the TextBox and watching for the Enter key to know when the input was completed. Knowing this, then I suggested they create a custom renderer to handle the KeyDown (or better yet KeyUp) event for the native control to work around this issue.
This does seem like an edge case and the custom renderer might just be the way to go rather than being a "workaround," but filing this as an enhancement request in case the Forms team feels this is something worth addressing in Forms code.
## Steps to reproduce
Need Bluetooth Barcode Scanner : Pegasus PS-1110
Device tested on: Microsoft Lumia 550(Window Phone)
OS Version : 1607 and OS buld:10.0.14393.189
1. Launch the app and connect the Bluetooth scanner.
2. Select the Entry control.
3. Scan any barcode.
Expected result: Entry field should populate after a single scan
Actual result: Need to scan barcode multiple times for Entry field to populate.
Microsoft Visual Studio Professional 2015
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Xamarin.Android 22.214.171.124 (7db2aac)
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Xamarin.iOS 126.96.36.199 (3cf8aae)
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This PR might actually help with this: https://github.com/xamarin/Xamarin.Forms/pull/747
However if it does not, as this has been classified as an enhancement request it would be best suited as a UserVoice suggestion or a proposal in our Evolution forum for future consideration. When submitting a proposal on the Evolution forum, be sure to first read the contribution guidelines so your proposal is ready for discussion with the Forms team and community.