Reachability实时检测网络连接状况

//Called by Reachability whenever status changes.

- (void)reachabilityChanged: (NSNotification* )note

{

    Reachability* curReach = [note object];

    NSParameterAssert([curReach isKindOfClass: [Reachability class]]);

    

    if (curReach == internetReach) {

        NetworkStatus netStatus = [curReach currentReachabilityStatus];

        

        switch (netStatus)

        {

            case NotReachable:

            {

                DDLogInfo(@"internet Reachability no internet");

            }

                break;

                

            default:

            {

                DDLogInfo(@"internet Reachability has internet begin xmppStart");

                [[[_xmppClient xmppiKnowFramework] xmppReconnect] manualStart];

            }

                break;

        }

    }

}

- (void)networkReachability {

    // Observe the kNetworkReachabilityChangedNotification. When that notification is posted, the

    // method "reachabilityChanged" will be called. 

    [[NSNotificationCenter defaultCenter] addObserver: self 

                                             selector: @selector(reachabilityChanged:) 

                                                 name: kReachabilityChangedNotification 

                                               object: nil];

    

    internetReach = [[Reachability reachabilityForInternetConnection] retain];

    [internetReach startNotifier];

}

http://blog.youkuaiyun.com/yuhuangc/article/details/7410452