This method should be implemented by a subclass to set up monitoring of a port when added to a given run loop in a given input mode.
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
The run loop to which to add the receiver.
The run loop mode to which to add the receiver
This method should not be called directly.