Returns the event store to its saved state.
- iOS 5.0+
- macOS 10.8+
- Mac Catalyst 13.0+Beta
- watchOS 2.0+
This method updates all the properties of all the objects with their corresponding values in the event store. Any local changes that were not saved before invoking this method will be lost. All objects that were created or retrieved using this store are disassociated from it and should be considered invalid.