How would I add networked multiplayer support to an iPhone game?

I am looking to extend an iPhone game by adding support for networked multiplayer capabilities (preferably over WiFi). How would you suggest I add this funct开发者_Python百科ionality to this application?

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Game Kit can be used to add match making and network communications to your game.

Start with the Game Kit Programming Guide which has step-by-step instructions for many scenarios and lots of sample code.