LockScreen Play/Pause audio control event callback

Hi,
I want to respond to Play/Pause button on LockScreen to control my music playing in the background.

I know it must be done in xcode project via:
"beginReceivingRemoteControlEvents" and "(void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent"

Music is already playing after clicking home button but i cant get the callback method to work.
I read there is some trick with sublassing UnityAppController but i cant get it to work :/.

If someone can help me with that it would be great.

 

bump

 

bump