iOS game center matchmaking, friends only?

I was just curious, is it 开发者_开发问答possible to make a game center match that you can only invite friends to? (i.e. no random matchups) How would you code that?

It looks like GKMatchRequest has the capability to do this using either the playerGroup or playersToInvite property.

What you want is probably to make a own custom GKMatchmakerViewController that only show friends during the match making.

It only works in OS 4.2.. which in my opinion would be a small group of people.. So just take note..

Here's the link: Link

Scroll all the way down and you will find your answer..