close method
Closes the event
and state
Streams
.
This method should be called when a Bloc
is no longer needed.
Once close is called, events
that are added will not be
processed.
In addition, if close is called while events
are still being
processed, the Bloc
will finish processing the pending events
.
Implementation
@override
Future<void> close() async {
instance = null;
return super.close();
}