Use the Playr Controller app on any iOS device as a virtual game controller for Playr or a virtual media controller for Playr Cinema.
The Playr Controller app replaces a bluetooth game controller with a virtual controller over WiFi.
Simply open Playr or Playr Cinema on one iOS device. Open Playr Controller on another, and use the second iOS device as a controller. Then, tap on the listed controller to connect from the controller selector.