Get IP Address iOS (Swift 4 & Objective-C)

Swift 4

 func getIPAddress() -> String? {  
     var address: String?  
     var ifaddr: UnsafeMutablePointer<ifaddrs>? = nil  
     if getifaddrs(&ifaddr) == 0 {  
       var ptr = ifaddr  
       while ptr != nil {  
         defer { ptr = ptr?.pointee.ifa_next }  
         let interface = ptr?.pointee  
         let addrFamily = interface?.ifa_addr.pointee.sa_family  
         if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {  
           if let name: String = String(cString: (interface?.ifa_name)!), name == "en0" {  
             var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))  
             getnameinfo(interface?.ifa_addr, socklen_t((interface?.ifa_addr.pointee.sa_len)!), &hostname, socklen_t(hostname.count), nil, socklen_t(0), NI_NUMERICHOST)  
             address = String(cString: hostname)  
           }  
         }  
       }  
       freeifaddrs(ifaddr)  
     }  
     return address  
   }  

Objective-C

+(NSString *)getIPAddress {  
   NSString *address = @"error";  
   struct ifaddrs *interfaces = NULL;  
   struct ifaddrs *temp_addr = NULL;  
   int success = 0;  
   // retrieve the current interfaces - returns 0 on success  
   success = getifaddrs(&interfaces);  
   if (success == 0) {  
     // Loop through linked list of interfaces  
     temp_addr = interfaces;  
     while(temp_addr != NULL) {  
       if(temp_addr->ifa_addr->sa_family == AF_INET) {  
         // Check if interface is en0 which is the wifi connection on the iPhone  
         if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"])  
         {  
           // Get NSString from C String  
           address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];  
         }  
       }  
       temp_addr = temp_addr->ifa_next;  
     }  
   }  
   // Free memory  
   freeifaddrs(interfaces);  
   return address;  
 }