Tuning variables when running a SpriteKit Game

I am would like to find out what are the best existing solution to tune a game built with sprite kit. Of course I can have all my tunable variables in a plist that is read every time I load the game, but I am looking to be able to tune the game on the fly. Unity can easily do that when running the game within the editor and 3rd party solution exist like SRDebugger to tune variables on device.
A quick search online didn't yield any concrete solution but before reinventing the wheel and write my own, I would like to find out what other developer are using.
Traditionally, game developers have used an in-game console.
Tuning variables when running a SpriteKit Game
 
 
Q