Check internet connection in React Native app

App.js

// quick snippet to check the connection in your RN app
// dispatches an `setIsConnected` action every time the NetInfo changes (on/off network)

componentDidMount() {
  const dispatchConnected = isConnected => this.props.dispatch(setIsConnected(isConnected));

  NetInfo.isConnected.fetch().then().done(() => {
    NetInfo.isConnected.addEventListener('change', dispatchConnected);
  });
}

what is 'isConnected'?

There is an open github issue detailing ongoing problems with .isConnected in iOS here: facebook/react-native#8615

I created a solution and put it in a repo here: https://github.com/JamesDorrian/NetInfoCheckConnection/tree/master