How do I attach data in POST request

How do I attach multiple data with a POST request in Swift. As attached screen shot from Postman it is working fine when select the x-www-form-urlencoded option How do I attach 5 data with the body like 'x-www-form-urlencoded' option?

Here the code:

var request = URLRequest(url: urlString)
        request.httpMethod = "POST"
        request.setValue("application/x-www-form-urlencoded;charset=UTF-8", forHTTPHeaderField: "Content-Type")
        
        var urlComponents = URLComponents()
        urlComponents.queryItems = [
            URLQueryItem(name: “***”, value: “***”),
            URLQueryItem(name: "***", value: "***"),
            URLQueryItem(name: "***", value: "***"),
            URLQueryItem(name: "***", value: "***"),
            URLQueryItem(name: "***", value: "***"),
        ]
        request.httpBody = urlComponents.percentEncodedQuery?.data(using: String.Encoding.utf8)
        
        let loadDataTask = URLSession.shared.dataTask(with: request) { (data, response, error) in
            if let _ =  error{
                completion(false,error)
            }
            else if let response = response as? HTTPURLResponse{
                if response.statusCode != 200{
                    completion(false,error)
                }
                else{
                    do{
                        if let parsedData = try? JSONSerialization.jsonObject(with: data!, options: []){
                            let ff = parsedData as? Dictionary<String,Any>
                            print(ff)
                        }
                    }
                }
                
            }
        }//let loadDataTask
        loadDataTask.resume()
    }

SWIFT 4:

let url = URL(string: “url”);
var urlRequest = URLRequest(url: url!)
urlRequest.setValue("application/x-www-form-urlencoded",forHTTPHeaderField: "Content-Type")
urlRequest.httpMethod = "POST"
let postString = “paramerter1=value1&parameter2=value2”
urlRequest.httpBody = postString.data(using: .utf8)