iOS獲取本機wifi的IP地址

+(NSString *)getWifiIPAddress{
    NSString *ipAddress = nil;

    struct ifaddrs *ifa_list = NULL;
    struct ifaddrs *tmp = NULL;
    int result;

    result = getifaddrs(&ifa_list);

    if(result == 0)
    {
        tmp = ifa_list;
        ipAddress = @"";

        while(tmp){
            if(tmp->ifa_addr->sa_family == AF_INET){
                if([[NSString stringWithUTF8String:tmp->ifa_name] isEqualToString:@"en0"])
                {
                    ipAddress = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)tmp->ifa_addr)->sin_addr)];
                    break;
                }
            }
            tmp = tmp->ifa_next;
        }
    }

    freeifaddrs(ifa_list);
    return ipAddress;
}