pub unsafe static EKEventStoreChangedNotification: &'static NSStringEKEventStore only.Expand description
Notification name sent out when the database is changed by either an external process, another event store in the same process, or by calling saveEvent: or removeEvent: on a store you are managing. When you receive this notification, you should consider all EKEvent instances you have to be invalid. If you had selected events for a date range using eventsMatchingPredicate, etc. for display, you should release them and re-fetch the events again. If you have an event you are actively using (e.g. you are currently viewing details for it or editing it), you can call [EKEvent refresh] to try to revalidate it against the latest state of the database. If that method returns YES, you can continue to use the event, otherwise, you should release it and abandon what you were doing with it. The view controllers provided by EventKitUI automatically deal with this for you. This notification will also be posted if access to events or reminders is changed by the user.
See also Apple’s documentation