As Mattew said, APEX is not supported for mobile. It means that if you want to use only PhysX (without APEX) on iOS - you can’t cause main Physx headers like “PhysXIncludes.h” and “PhysXSupport.h” are dependent with APEX includes. It will be build for Android, but will fail on iOS. I think that it’s very strange and looks like a bug.
In my case I found workaround - I copied all required physx includes in my class with physics and I redefined all required macroses and variables. And now I can compile project and run it on iOS and Android without APEX module.