Add copy argument to SaveToCameraRoll

[olokobayusuf]

When copy is false, the media file will be deleted from the app's private documents directory once it has been added to the camera roll. The default will be copy = true

[mikkoh]

So this is definitely cool. However if someone wants to do something like the following sequence:

1. SaveToCameraRoll
2. Share*
3. Delete the file that was saved to camera roll and shared

If I do copy = false during Step #1 then I won't be able to share. I still think the right fix is to add a callback for when SaveToCameraRoll completes.

This is why in iOS they have completionHandler. I really wish Unity just added something beside SendMessage to specifically handle callbacks. It's such bad api design not to. Although I guess 3ps can create a lib thats like a messaging bridge.

[olokobayusuf]

However if someone wants to do something like the following sequence:
...
If I do copy = false during Step #1 then I won't be able to share. I still think the right fix is to add a callback for when SaveToCameraRoll completes.

This would be fine, since you can use the ShareCallback when calling Share to delete the file.

This is why in iOS they have completionHandler. I really wish Unity just added something beside SendMessage to specifically handle callbacks. It's such bad api design not to.

I agree with this. We never use UnitySendMessage because it is very sloppy (you are limited to one string argument). So instead we use C# delegates invoked directly from C++/C/Obj-C. It's much much more flexible, but we have to manually handle threading concerns (because most of the time, the thread that calls back into C# isn't UnityMain, and we all know how Unity hates its API's being called on non-main threads).

[olokobayusuf]

Implemented in 230a472