I suppose it would depend on hardware limitations. As far as I remember, Airdrop on OS X also requires specific hardware for the WiFi connection, only found in 2008+ Macs. It could be that a similar connection is possible between Macs and iOS devices, again, supposing that the hardware allows it. Even if that would not be possible, is it then not possible to find a workaround using WiFi? You can already sync your iOS device over WiFi with your Mac, so it should be possible at least indirectly. Regardless, this is Apple's problem to solve, since they are the ones creating the confusion in the first place.
No no, there should be no hardware issue at all. Wifi-direct and bluetooth should be all that's needed to make it work with any iOS device and any Mac that already support AirDrop.
I meant software. iOS devices and Macs both have completely different ways to doing AirDrop. Everyone seems to ask for this feature, but no one has any idea how it would work.
What files would you want to transfer and where?
I suppose from an iOS device
to a Mac, there are some options. Certain files, like a photo, or an iWork document could conceivably be transferred from iOS device to the Desktop of Mac. WHY you'd want to do that is beyond me, considering this is exactly what iCloud is for, and does
better.
So let's assume its not your Mac, and doesn't have your iCloud account attached to it. Let's also assume that even though its not your Mac, and you're standing next to it, that you're
also on the same WiFi network as that Mac. In this unbelievably rare case, it would be unnecessary to build in AirDrop support. At this point, just email the file. It would almost always be faster than AirDrop anyway and doesn't require interaction on both devices at the same time to send / approve / receive.
As bad as that was, there is even less sense in transferring from Mac to iOS device, as there is no 'Desktop' to drop the file on to. You've have to be transferring a file into a corresponding App that is meant to handle it, and odds are you don't need to, because iCloud has already done it.
So again...what is this mythical need for AirDrop across Mac and iOS?