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NetInfo

NetInfo exposes info about online/offline status

reachabilityIOS

Asynchronously determine if the device is online and on a cellular network.

• none - device is offline
• wifi - device is online and connected via wifi, or is the iOS simulator
• cell - device is connected via Edge, 3G, WiMax, or LTE
• unknown - error case and the network status is unknown

NetInfo.reachabilityIOS.fetch().done((reach) => {
  console.log('Initial: ' + reach);
});
function handleFirstReachabilityChange(reach) {
  console.log('First change: ' + reach);
  NetInfo.reachabilityIOS.removeEventListener(
    'change',
    handleFirstReachabilityChange
  );
}
NetInfo.reachabilityIOS.addEventListener(
  'change',
  handleFirstReachabilityChange
);

isConnected

Available on all platforms. Asynchronously fetch a boolean to determine internet connectivity.

NetInfo.isConnected.fetch().done((isConnected) => {
  console.log('First, is ' + (isConnected ? 'online' : 'offline'));
});
function handleFirstConnectivityChange(isConnected) {
  console.log('Then, is ' + (isConnected ? 'online' : 'offline'));
  NetInfo.isConnected.removeEventListener(
    'change',
    handleFirstConnectivityChange
  );
}
NetInfo.isConnected.addEventListener(
  'change',
  handleFirstConnectivityChange
);

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Reference