获取wifi网速

+ (NSString *)getByteRate {
    
    long long intcurrentBytes = [ToolManager getInterfaceBytes];
    NSString *rateStr = [ToolManager formatNetWork:intcurrentBytes];
    return rateStr;
}

+ (long long) getInterfaceBytes {
    struct ifaddrs *ifa_list = 0, *ifa;
    if (getifaddrs(&ifa_list) == -1) {
        return 0;
    }
    uint32_t iBytes = 0;
    uint32_t oBytes = 0;
    for (ifa = ifa_list; ifa; ifa = ifa->ifa_next) {
        if (AF_LINK != ifa->ifa_addr->sa_family)
            continue;
        if (!(ifa->ifa_flags & IFF_UP) && !(ifa->ifa_flags & IFF_RUNNING))
            continue;
        if (ifa->ifa_data == 0)
            continue;
        /* Not a loopback device. */
        if (strncmp(ifa->ifa_name, "lo", 2)){
            struct if_data *if_data = (struct if_data *)ifa->ifa_data;
            iBytes += if_data->ifi_ibytes;
            
            oBytes += if_data->ifi_obytes;
        }
    }
    freeifaddrs(ifa_list);
    NSLog(@"\n[getInterfaceBytes-Total]%d,%d",iBytes,oBytes);
    return iBytes + oBytes;
}

+ (NSString *)formatNetWork:(long long int)rate {
    if (rate <1024) {
        return [NSString stringWithFormat:@"%lldB", rate];
    } else if (rate >=1024&& rate <1024*1024) {
        return [NSString stringWithFormat:@"%.1fKB", (double)rate /1024];
    } else if (rate >=1024*1024&& rate <1024*1024*1024){//
        return [NSString stringWithFormat:@"%.1fMB", (double)rate / (1024*1024)];
    } else {
        return [NSString stringWithFormat:@"%.1fGB", (double)rate / (1024*1024*1024)];
    }
}