Open a feature request in the bugtracker "report a bug" and name it like "OBDII feature for Apple".
tracker.php?p=4
You will get a beta there and if it is running (I think it might be a little bit more work) it will be published.
Depends on the tutorial you will write for the others

I do not know the IOS market but there might be some different OBD software packages. A free one would be great for the tut.