Hm, that's strange. I have no problem with barcode scan using Android version, maybe it's IOS version specific issue?
We need more reports from IPhone users.

Same problem here with barcode scanning using Google Authenticator on iOS.
The error message looks something like this:
Invalid Barcode
'otpauth://totp/LTCMine.ru mining pool?
secret=XXXXXXXXXXXXXXXX' is
not a valid authentication token barcode
Malformed URL?