How to make NSURLSession POST request in Swift

Question

Hi I am very beginner for Swift and I am trying to make NSURLSession "Post" request sending some parameter like my below code

According to my below code response not coming from server can some one help me please

BackGroundClass:-

 import UIKit  protocol sampleProtocal{      func getResponse(result:NSDictionary)     func getErrorResponse(error:NSString) }  class BackGroundClass: NSObject {      var delegate:sampleProtocal?      func callPostService(url:String,parameters:NSDictionary){           print("url is===>\(url)")          let request = NSMutableURLRequest(URL: NSURL(string:url)!)          let session = NSURLSession.sharedSession()         request.HTTPMethod = "POST"          //Note : Add the corresponding "Content-Type" and "Accept" header. In this example I had used the application/json.         request.addValue("application/json", forHTTPHeaderField: "Content-Type")         request.addValue("application/json", forHTTPHeaderField: "Accept")          request.HTTPBody = try! NSJSONSerialization.dataWithJSONObject(parameters, options: [])          let task = session.dataTaskWithRequest(request) { data, response, error in             guard data != nil else {                 print("no data found: \(error)")                 return             }              do {                 if let json = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? NSDictionary {                     print("Response: \(json)")                     self.mainResponse(json)                 } else {                     let jsonStr = NSString(data: data!, encoding: NSUTF8StringEncoding)// No error thrown, but not NSDictionary                     print("Error could not parse JSON: \(jsonStr)")                     self.eroorResponse(jsonStr!)                 }             } catch let parseError {                 print(parseError)// Log the error thrown by `JSONObjectWithData`                 let jsonStr = NSString(data: data!, encoding: NSUTF8StringEncoding)                 print("Error could not parse JSON: '\(jsonStr)'")                 self.eroorResponse(jsonStr!)             }         }          task.resume()     }      func mainResponse(result:NSDictionary){         delegate?.getResponse(result)     }      func eroorResponse(result:NSString){         delegate?.getErrorResponse(result)     } } 

ViewController:-

import UIKit  class ViewController: UIViewController,sampleProtocal {      override func viewDidLoad() {         super.viewDidLoad()          let delegate = BackGroundClass();         delegate.self;          let params = ["scancode":"KK03799-008", "UserName":"admin"] as Dictionary<String, String>          let backGround=BackGroundClass();         backGround.callPostService("url", parameters: params)     }      func getResponse(result: NSDictionary) {         print("Final response is\(result)");     }      func getErrorResponse(error: NSString) {         print("Final Eroor code is\(error)")     } } 

Answer 1

Swift 4 post example with json payload-

func postAction(_ sender: Any) {     let Url = String(format: "your url")     guard let serviceUrl = URL(string: Url) else { return }     let parameterDictionary = ["username" : "Test", "password" : "123456"]     var request = URLRequest(url: serviceUrl)     request.httpMethod = "POST"     request.setValue("Application/json", forHTTPHeaderField: "Content-Type")     guard let httpBody = try? JSONSerialization.data(withJSONObject: parameterDictionary, options: []) else {         return     }     request.httpBody = httpBody          let session = URLSession.shared     session.dataTask(with: request) { (data, response, error) in         if let response = response {             print(response)         }         if let data = data {             do {                 let json = try JSONSerialization.jsonObject(with: data, options: [])                 print(json)             } catch {                 print(error)             }         }     }.resume() }