Barcode reader would be extremely valuable. There are - partial - solutions. Support is an issue.
Xamarin Forms is very well suited for LOB applications. Barcode reader is a very useful and missing part.
Would the opposite also be true, ie, being able to generate a barcode in app?
Not only Barcode but also QR-Code reader would be fine.
Would this work by integrating zxing or writing new solution from scratch? I have no idea how complex reading barcode/QR code is
This feature has quite a nice implementation with ZXing: https://github.com/Redth/ZXing.Net.Mobile
You can check out the samples on how to integrate this.
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Not only Barcode but also QR-Code reader would be fine.