iOS checking WiFi Data usage

The data usage of a WiFi Device can be calculated like below. 

Below code snippet can help to get the data counters. 

BOOL   success;

    struct ifaddrs *addrs;

    const struct ifaddrs *cursor;

    const struct if_data *networkStatisc;

    

    int WiFiSent = 0;

    int WiFiReceived = 0;

    

    int WiFiPacketsSent = 0;

    int WiFiPacketsReceived = 0;

    

    int WWANSent = 0;

    int WWANReceived = 0;

    

    NSString *name=[[NSString alloc]init];

    

    success = getifaddrs(&addrs) == 0;

    if (success)

    {

        cursor = addrs;

        while (cursor != NULL)

        {

            name=[NSString stringWithFormat:@"%s",cursor->ifa_name];

            NSLog(@"ifa_name %s == %@\n", cursor->ifa_name,name);

            // names of interfaces: en0 is WiFi ,pdp_ip0 is WWAN

            

            if (cursor->ifa_addr->sa_family == AF_LINK)

            {

                if ([name hasPrefix:@"en"])

                {

                    networkStatisc = (const struct if_data *) cursor->ifa_data;

                    WiFiSent+=networkStatisc->ifi_obytes;

                    WiFiReceived+=networkStatisc->ifi_ibytes;

                    

                    WiFiPacketsSent+= networkStatisc->ifi_opackets;

                    WiFiPacketsReceived+= networkStatisc->ifi_ipackets;

                    

The complete code can be found here 

https://drive.google.com/file/d/0B0ZgwdHsnw1bTDhOVFNBekJIaDg/view?usp=sharing 

References:

http://stackoverflow.com/questions/6762766/mac-address-with-getifaddrs

http://stackoverflow.com/questions/13542198/ios-how-to-find-network-data-usage-programatically

http://stackoverflow.com/questions/2779600/how-to-estimate-download-time-remaining-accurately