It isn't possible with the current call-out interface. As you say, best possible workaround might be to write an Obj-C method that passes the completion argument you want, and then call that with the call-out interface.
That said, it might be possible to add this capability if it's really important to you.
- Wukix, 503 days ago
Thanks for the response. It would be a nice-to-have, but it's not critical. Again, just testing the boundaries.