An abstract superclass that represents the account a calendar belongs to.
- iOS 5.0+
- macOS 10.8+
- watchOS 2.0+
You do not create instances of this class; instead, you retrieve
EKSource objects from an
EKEvent object. Use the sources property to get all the
EKSource objects for an event store, and use the methods in this class to access properties of the source object.