ios8 - iOS - Share data(and updates of data) between a specific group of devices using the same app -

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for simple example, if app can display photos , takes new photo, other people have same app, in same group(if possible group way) has been created beforehand, update of new photo - (the list of photos change , app handle accordingly) (and updated via push notification or other automatic 'update'). useful editing photo , updating , others update.

i wondering options available (ios 8+ solution now) to:

  1. have download app , "invite" others have downloaded app part of group - have receive additions or updates app in way have described. really not want have know else's e-mail address this. looking option.

  2. sharing data between group members (and solution might depend on #1, not sure).

i have read on here solutions nsuserdefaults or key-chain grouping since talking images here , depending on #1 there might other better solutions.


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