This is a quick introduction to show you how to setup react native. Quick note, I had to restart my computer after installing watchman for it to work. I'm not 100% sure why, but it worked after restarting my computer.
brew install node brew install watchman npm install -g react-native-cli
Create and start project
react-native init ExampleReactNative cd ExampleReactNative npm start
Launch IOS simulator
Launch Xcode, open up the project you just created, and run the project. You should see an IOS simulator pop up and now you can see the app you just created. Xcode is simply there to run the simulator and you aren't going to be using it to edit any code. Use a standard IDE or text editor to change the code. Press CMD+R on the IOS simulator to see your changes take place.
Now you're ready to make phone apps!
React Native: http://facebook.github.io/react-native/