Notifications about network status changes on iOS

Question

I would like my app to get asynchronous notifications about network status changes, i.e. network goes down entirely or when the phone switches from cellular to Wi-Fi.

I know how to test this synchronously using Reachability, but is there a way to get asynchronous notifications?

Answer 1

Assuming you're using Reachability 2.x you can just observe the reachability changed notification:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(reachabilityChanged:)
                                             name:kReachabilityChangedNotification
                                           object:nil];