Xamarin app Barcode Scanner

I have a Xamarin app and I need Barcode scanner.
I have already implemented the code with Barcodescanner.xf plugin and it works. I have also implemented with Zxin plugin but this plugin is slow with scanning.

As I wrote, Barcodescanner.xf plugin works but there is a problem with scanning the second time. It works at the first scan, but when i try the second it doesnt work. So I want you to fix the problem.