I really need to pay attention to the WWDC talks – I totally missed the one on CallKit this year.
Evidently Apple now allows us to use the iOS call interface for apps (specifically VOIP apps). I haven’t tried it out yet but this could be the solution for a better experience of “Swipe to Stop Action” in StageCaller.
Unfortunately I’m tied up with android for the foreseeable future… so maybe by the end of year…