ekevent

I am trying to make Event Syncing feature for a Project. I need to sync events with the remote server. Let's say I Installed the App in Device A. If I login to another device lets take B, then events synced from A should also appear in Device B, and events of B should also be synced. Now if I again login into the Device A, Events of B should be added. But events previously from A should not again be added to Device A again For this I decided to keep its eventIdentifier on the remote database. The Issue now happens when I again Go back to Device B, where events previously synced from Device A

My goal is to add some invitees to an EKEvent . I've looked into other questions like this, such as this one , but all say that it is essentially impossible to add EKParticipant s to an EKEvent programmatically. I do see that the attendees property is read-only, but I see other services like Sunrise using it in their mobile app. I'm confident that they're using some system that at least partially integrates with EventKit because they're pulling in calendars from the user's iCal app. Invites sent from an added Exchange account, for example, are also clearly sent by the Exchange service as