Colin Ramsay shared some tidbits on getting started with Event Emitters in React Native:

React Native - Event Emitters blog post

react-native-event-emitters code example on GitHub

Events are a great way of communicating between components, but they should be used carefully to avoid creating an unfathomable mess of interconnections. In this example, we'll show how to use an event emitter to allow a React Native NavigatorIOS to talk to its child components.