Add observer to network changes

Reachability uses NSNotification messages to alert observers when the network state has changed. Your class will need to become an observer.

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

Elsewhere in your class, implement method signature

- (void) reachabilityChanged:(NSNotification *)note {
    //code which reacts to network changes
}

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