The project is built from the MAME 0.37B5 core with an all new front end using SpriteKit.
The advantage of using SpriteKit for the front end and OSD is that it can be targeted for any supported Apple device including the AppleTV.
The new project is 64 bit compatible and uses SKMutableTexture as the MAME render surface.
The MAME4apple project is built on the MAME 0.37B5 core as downloaded from the MameDev depot so it is compatible with the MAME4all romset.
It works on iOS 10+ devices and can be compiled with Xcode 8+.