How do I write native iOS code for React Native?
In part 1, we began simplifying our React Native native iOS code by separating an idiomatic Swift class from a React Native adapter. We’re going to finish this extraction by moving over a method that returns data. By the end of this screencast you should be comfortable with writing idiomatic Swift methods that return data synchronously or asynchronously, and adapting them to React Native.
For the More Curious...
Idiomatic Swift with React Native - Part 1
Native Modules with React Native