I’ve mentioned a few resources for working with the iOS Game Center including this tutorial on implementing multiplayer and this tutorial on working with leaderboards and achievements.
Here’s an extensive Game Center helper library from iRareMedia that called GameCenter Manager.
GameCenter Manager provides helper methods allowing you to easily retrieve, sync, submit and save Game Center data, present GameKitControllers views, connect to GameCenter, check if GameCenter is available, and more. Documentation is available in Xcode.
There is an example application included that demonstrates how to use everything.
You can find GameCenterManager on Github here.
A nice library that greatly simplifies working with GameCenter.
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