you mix two things here:
1. Catalyst is a positioning system - and a bit different compared to our traditional receivers as its a software defined GNSS receiver
2. Raw data like NMEA messages are available on all Trimble devices although they are not as useful as it may sound - especially on iOS. But any traditional receiver like an R2 or R10 can output NMEA.
While talking about iOS things get a bit complicated. So we don't have Catalyst for iOS.
But what we do have are strategies to access raw data of a traditional receiver. I'll shoot you a mail on the topic as I belief it might be a bit too much for this platform.
If I'm wrong I can still copy/ paste it here later (in case of demand).