ios - Can we enable Game Center for particular version? -

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i new game center, after gone through game center in&out. have questions in mind, need clarification of guys:

1) can enable game center particular app version,(ie) previous app version 1.0 doesn't have game center feature, enable game center 2.0 app version. so, question is, if enable game center app version 2.0, whether can affect previous app version 1.0?

2) why of app not providing game center login feature inside app, instead of login via game center feature?

1) yes, can integrate game center in same app next version. not problem @ all. user notification update available once updated have feature. , previous version work fine if don't want update.

2) if app game center enabled means, has communicate many times in many ways. eg. score, update score, achievements, leader board , challenges. of above feature requires game center authentication proceed further. of app (even 1 created) needs game center login @ start after works smoothly. better ask authentication using login via game center.


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