This library can be added to any app to support the DualShock 4 controller under iOS 12 (and earlier versions probably)
Note: You probably don't need this since DS4 support is official in iOS 13
Technical information: Library links with IOKit (which is private on iOS) and assumes whatever is connected is a DS4 (iOS doesn't let us see the vendor/model information)
Usage: Add into app and use UnofficialController.controllers instead of GCController.controllers
Note: Controller has to be connected via USB.
Working proof with Provenance: https://youtu.be/YtmhrpnyNlE