CloudKit shares a private container between users
I am planning to develop an application used to exchange information about geographic locations (coordinates, notes, drawings), a kind of treasure hunt, and I did not understand if it is possible to use CloudKit to share a part of a private container between users. If so, how can I do this? I need to create something like Apple in the Reminders app where a user can "invite" other users and have a common list to share between all of them, where everyone can insert or edit things.
After all, if it can't be done with CloudKit, can I do it with Parse?
Thank!
Data in a private container cannot be transferred directly. You must use a public container for this function. You just need to create the correct filters in your application so that you only share data with the people you want to share the data with.
In iOS 10 / macOS 10.12, it is now possible to share hierarchies of records in a user's private database with other users.
Overview: [WWDC 2016] Session 226 - What's New in CloudKit
If you want to start diving into the new documentation, check out:
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Ckshare
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CKShareParticipant
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CKFetchShareParticipantsOperation
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CKFetchShareMetadataOperation
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CKAcceptSharesOperation
And this thread in the Apple Developer Forums which provides some sample code.