Do we have to offer user ways to delete game center? If it does, then how to do it? Is there any documents for reference? Thanks
How to Handle Game Center to Follow Account Deletion
You do not need to offer users a way to delete or sign out of Game Center. If a user chooses to sign out of Game Center on the device, they can do that in Settings.app and your game will be notified on next app launch that no user is signed in through the authentication handler. You should make sure to handle situations when no user is authenticated and gracefully degrade your game experience.
@keithpk, thank you!