How to use reachability class to detect valid internet connection?

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EDITED: If you want to check reachability before some code execution you should just use

Reachability *reachability = [Reachability reachabilityForInternetConnection];    
NetworkStatus internetStatus = [reachability currentReachabilityStatus];
if (internetStatus != NotReachable) {
    //my web-dependent code
}
else {
    //there-is-no-connection warning
}

You can also add a reachability observer somewhere (i.e. in viewDidLoad):

Reachability *reachabilityInfo;
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(myReachabilityDidChangedMethod)
                                             name:kReachabilityChangedNotification
                                           object:reachabilityInfo];

Don’t forget to call [[NSNotificationCenter defaultCenter] removeObserver:self]; when you no longer need reachability detection (i.e. in dealloc method).

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