Check network connectivity

Note : Import Reachability files into your project

-(void)updateWifiAvailability; // Declare in Interface

 [self updateWifiAvailability]; // Invoke function

   /*Configure and check for reachability */

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

    self.wifiReachability = [Reachability reachabilityForLocalWiFi];

[self.wifiReachability startNotifier];

#pragma mark -

#pragma mark Internal Methods

-(void)updateWifiAvailability

{

    NetworkStatus netStatus = [self.wifiReachability currentReachabilityStatus];

    if (netStatus == ReachableViaWiFi){

         // Network available

        _hasWifiConnection = YES;

    }

    else {

        // Network not available

        _hasWifiConnection = NO;

    }

}

-(void)wifiChanged:(NSNotification *)n

{

    [self updateWifiAvailability];

}