How to implement SOAP Web service with SWIFT programming language?

Update (25 March, 2016): I’ve updated codes for Xcode 7 and swift 2.0

Update (16 September, 2016): Code updated for Xcode 7.2.1 and swift 2.1.1

Today I’ll show you how to develop SWIFT based application that communicates with a web service using SOAP.

We’ll use w3cSchools.com’s web service and convert temperature from celcious to farengheight (http://www.w3schools.com/webservices/tempconvert.asmx?op=CelsiusToFahrenheit)

If you are new to SOAP, then I’d recommend you to learn it from the following link:

http://www.w3schools.com/webservices/ws_soap_intro.asp

And to learn the basics of swift, you can read apple’s documentation by clicking here.

Requirements: Basic understanding of Web services, SOAP and swift.

First open Xcode 6 (or later version) and create a new project named “Temperature Converter”. Select swift as language from first dialog box. Created project will contain ViewController.swift, Main.storyboard and other files.

Screen Shot 2014-10-24 at 11.23.03 PM
Open Main.storyboard and add textfield, labels and a buttons as shown in the screenshot below.
Screen Shot 2014-10-24 at 11.30.28 PM
Add outlets of textfields and add an action for the button. If the image below is too small to view, please click on it to see the full size. In case if you don’t know how to do this, open storyboard and swift file side by side in Assistant editor view. Ctrl + Drag and drop textfields to the swift file. Do the same thing for action, just change the connection type from “Outlet” to “Action” in popup box. I gave the outlet names txtCelcius and txtFahrenheit. For button’s action name I used actionConvert. You can use any name. I didn’t add any outlet for button.
Screen Shot 2014-10-24 at 11.31.55 PM
Now let’s change the codes step by step to add SOAP service with this application.

Step 1: Add delegation names that we’ll be delegating through out this project. We’ll delegate:UITextFieldDelegate, NSURLConnectionDelegate, NSXMLParserDelegate.

 

Step 2: We need some variables to store received data from server and keep track of those data. Let’s declare them.

 

Step 3: Modify the actionConvert method to let it get user input from Celcius textfield and make a request to server using post method. The full actionConvert method will look like following code:

 


 

Step 4: Using following 3 methods we’ll delegate with NSURLConnection. First 2 methods will save data received from server in mutableData variable. The last method will start NSXMLparser to parse SOAP message.

 

Step 5: We need 2 methods to parse SOAP message returned from server. I’ll discuss one by one so that you can understand them.

 

The first method is called each time a new node or element of SOAP (or XML) is parsed. We need to  save this name so that we can detect each node in second method. Let’s see the first method:

 

 

The second method will check the current element name and if it finds “CelsiusToFahrenheitResult” element, then it displays the value in Fahrenheit text field.

Now, save and run the code. If you put any numeric value in Celsius box and tap Convert button, Fahrenheit box will display the result fetched from server.

 

iOS Simulator Screen Shot Oct 27, 2014, 7.33.25 PM

 

You can download the whole project from here.

Or can pull the project from Github:

https://github.com/rubelbd82/soapwithswift

Best of luck!!!

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40 thoughts on “How to implement SOAP Web service with SWIFT programming language?”

  1. Help please
    i downloaded this project and it doesn’t parse anything..

    help please I need this for a school project 🙂

    Reply

  3. After exploring a few of the articles on your blog, I honestly appreciate your technique of blogging. I added it to my bookmark site list and will be checking back in the near future. Please visit my website as well and tell me how you feel.

    Reply

  5. Hey.

    nice tutorial, but in my Xcode 6 with Swift i dont have the functrion:
    NSURL.URLWithString <- URLWithString is unavaible, use object constructor NSURL

    Greetz

    Reply

  6. Hi,
    I downloaded the project and directly got two errors. I am using Xcode version 6.3. Any Idee what I am doing wrong?
    Thanks for any help!

    func application
    AppDelegate.swift:17:10: Objective-C method ‘application:didFinishLaunchingWithOptions:’ provided by method ‘application(_:didFinishLaunchingWithOptions:)’ conflicts with optional requirement method ‘application(_:didFinishLaunchingWithOptions:)’ in protocol ‘UIApplicationDelegate’

    func parser
    ViewController.swift:93:10: Objective-C method ‘parser:didStartElement:namespaceURI:qualifiedName:attributes:’ provided by method ‘parser(_:didStartElement:namespaceURI:qualifiedName:attributes:)’ conflicts with optional requirement method ‘parser(_:didStartElement:namespaceURI:qualifiedName:attributes:)’ in protocol ‘NSXMLParserDelegate’

    Reply

  7. Hi,
    I downloaded the project and directly got two errors. I’am using Xcode version 6.3. Any Idee what I am doing wrong?
    Thanks for any help!

    func application
    AppDelegate.swift:17:10: Objective-C method ‘application:didFinishLaunchingWithOptions:’ provided by method ‘application(_:didFinishLaunchingWithOptions:)’ conflicts with optional requirement method ‘application(_:didFinishLaunchingWithOptions:)’ in protocol ‘UIApplicationDelegate’

    func parser
    ViewController.swift:93:10: Objective-C method ‘parser:didStartElement:namespaceURI:qualifiedName:attributes:’ provided by method ‘parser(_:didStartElement:namespaceURI:qualifiedName:attributes:)’ conflicts with optional requirement method ‘parser(_:didStartElement:namespaceURI:qualifiedName:attributes:)’ in protocol ‘NSXMLParserDelegate’

    Reply

  8. Hi ,
    I am working on xcode 6.3.2
    but it getting error to me
    if I use the code in connection area

    var connection = NSURLConnection(request: theRequest, delegate: self, startImmediately: true)
    connection?.start()

    if(connection == true) {
    var mutableData : Void = NSMutableData.initialize()
    println(“connect “)
    }
    else
    {
    println(“not connected “)
    }

    it show me not connected . Please help .
    Thanks

    Reply

    1. Please, check the url that you are trying to reach is working on your browser. Also check your internet connection.

      Reply

      1. Hi
        I have already checked
        please see I am doing anything wrong here

        var soapMessage = “”

        // NSLog(“soapMessage generated is: %@”, soapMessage)

        // Soap URL Works
        var urlString = “http://assetwebservice.sudesi.in/service.svc”

        //Below https URL does not work

        var url = NSURL(string: urlString)
        var theRequest = NSMutableURLRequest(URL: url!)

        //Get Length of request
        var msgLength = String(count(soapMessage))

        // POST Header values
        theRequest.addValue(“text/xml; charset=utf-8”, forHTTPHeaderField: “Content-Type”)
        theRequest.addValue(msgLength, forHTTPHeaderField: “Content-Length”)
        theRequest.addValue(“http://tempuri.org/IService/BindCategory”, forHTTPHeaderField: “SoapAction”)
        theRequest.HTTPMethod = “POST”
        theRequest.HTTPBody = soapMessage.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
        NSLog(“Request is: %@”, theRequest.allHTTPHeaderFields!)

        var connection = NSURLConnection(request: theRequest, delegate: self, startImmediately: true)
        connection?.start()

        if (connection == true) {
        var mutableData : Void = NSMutableData.initialize()
        }
        else
        {

        println(“false “)
        }

        }

        func connection(connection: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
        mutableData.length = 0;
        // println(“0”)
        }

        func connection(connection: NSURLConnection!, didReceiveData data: NSData!) {
        mutableData.appendData(data)
        //println(“more > 0”)
        }

        func connection(connection: NSURLConnection, didFailWithError error: NSError) {
        NSLog(“Error with Soap call: %@”, error)
        }

        func connectionDidFinishLoading(connection: NSURLConnection!) {

        var xmlParser = NSXMLParser(data: mutableData)
        xmlParser.delegate = self
        xmlParser.parse()
        xmlParser.shouldResolveExternalEntities = true

        }

        func parser(parser: NSXMLParser, foundCharacters string: String?) {

        if(!string!.isEmpty)
        {
        println(string)
        if currentElementName == “CelsiusToFahrenheitResult” {
        // txtFahrenheit.text = string
        println(string)
        }
        }
        }

        Reply

    2. Same error for me.
      I don’t understand why connection is not true. My code:

      var urlString = “http://www.w3schools.com/webservices/tempconvert.asmx”

      var url = NSURL(string: urlString)!

      var theRequest = NSMutableURLRequest(URL: url)

      var msgLength = String(count(soapMessage))

      theRequest.addValue(“text/xml; charset=utf-8”, forHTTPHeaderField: “Content-Type”)
      theRequest.addValue(msgLength, forHTTPHeaderField: “Content-Length”)
      theRequest.HTTPMethod = “POST”
      theRequest.HTTPBody = soapMessage.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion:false) // or false

      var connection = NSURLConnection(request: theRequest, delegate: self, startImmediately: true)
      connection!.start()

      Reply

  10. Your code was ausum …..Thanks a ton…….I hade to make two changes though

    import UIKit

    class ViewController: UIViewController, UITextFieldDelegate, NSURLConnectionDelegate, NSXMLParserDelegate {

    @IBOutlet weak var txtInput: UITextField!

    @IBOutlet weak var txtOutput: UITextField!

    var mutableData:NSMutableData = NSMutableData.alloc()

    var currentElementName:NSString = “”

    @IBAction func goNext(sender: AnyObject) {

    //txtOutput.text = “67”

    var celcius = txtInput.text

    var soapMessage = “\(celcius)”

    var urlString = “http://www.w3schools.com/webservices/tempconvert.asmx?op=CelsiusToFahrenheit”

    var url = NSURL(string : urlString)

    var theRequest = NSMutableURLRequest(URL: url!)

    var msgLength = String(countElements(soapMessage))

    theRequest.addValue(“text/xml; charset=utf-8”, forHTTPHeaderField: “Content-Type”)
    theRequest.addValue(msgLength, forHTTPHeaderField: “Content-Length”)
    theRequest.HTTPMethod = “POST”
    theRequest.HTTPBody = soapMessage.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) // or false

    var connection = NSURLConnection(request: theRequest, delegate: self, startImmediately: true)
    connection!.start()

    connection?.start()

    if let connection = connection {
    connection.start()
    }
    else {
    // handle error case
    }

    if (connection == true) {
    var mutableData : Void = NSMutableData.initialize()
    }

    }

    func connection(connection: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
    mutableData.length = 0;
    }

    func connection(connection: NSURLConnection!, didReceiveData data: NSData!) {
    mutableData.appendData(data)
    }

    func connectionDidFinishLoading(connection: NSURLConnection!) {
    var xmlParser = NSXMLParser(data: mutableData)
    xmlParser.delegate = self
    xmlParser.parse()
    xmlParser.shouldResolveExternalEntities = true

    }

    func parser(parser: NSXMLParser!, didStartElement elementName: String!, namespaceURI: String!, qualifiedName qName: String!, attributes attributeDict: NSDictionary!) {
    currentElementName = elementName
    }

    func parser(parser: NSXMLParser!, foundCharacters string: String!) {
    if currentElementName == “CelsiusToFahrenheitResult” {
    txtOutput.text = string
    }
    }

    override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
    }

    }

    Reply

  14. this code doesn’t work, i have been test many thing, but connection only is = false, I have been lost my time
    xcode 7.2

    Reply

  15. (Swift 2.0 Xcode 7.0 beta 5)
    Issue I have is with the Fahrenheit text box not refreshing unless it is clicked, but the request is made and parsed correctly…

    Another way to the same end for what it is worth:

    class ViewController: UIViewController, UITextFieldDelegate, NSURLConnectionDelegate, NSXMLParserDelegate {
    var currentElementName : NSString = “” // used to track element name from the xml response

    @IBOutlet var txtCelcius : UITextField! // input element
    @IBOutlet var txtFahrenheit : UITextField! // output element

    // Call Soap Service
    @IBAction func actionTempConvert(sender: AnyObject) {
    let celcius = txtCelcius.text // get input value
    var soapMessage = “\(celcius!)”
    let urlString = “http://www.w3schools.com/webservices/tempconvert.asmx” // set Service endpoint with input “Celsius”
    let url = NSURL(string : urlString) // create instance of NSURL
    let theRequest = NSMutableURLRequest(URL: url!) //
    let msgLength = String(soapMessage.characters.count) //
    theRequest.addValue(“text/xml; charset=utf-8”, forHTTPHeaderField: “Content-Type”)
    theRequest.addValue(msgLength, forHTTPHeaderField: “Content-Length”)
    theRequest.HTTPMethod = “POST”
    theRequest.HTTPBody = soapMessage.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) // or false
    let session = NSURLSession.sharedSession()
    session.dataTaskWithRequest(theRequest) { (data, response, error) -> Void in
    let xmlParser = NSXMLParser(data: data!)
    xmlParser.delegate = self
    xmlParser.parse()
    xmlParser.shouldResolveExternalEntities = true
    }.resume()
    }
    // End Soap Call

    // Parse it
    func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
    currentElementName = elementName
    }
    func parser(parser: NSXMLParser, foundCharacters string: String) {
    if currentElementName == “CelsiusToFahrenheitResult” {
    txtFahrenheit.text = string
    }else{
    }
    }
    // End Parsing

    override func viewDidLoad() {
    super.viewDidLoad()
    }
    override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    }
    }

    Reply

  17. This worked for me in Swift 2.0.

    //
    // ViewController.swift
    // Temperature Converter
    //
    // Created by Farhad on 10/24/14.
    // Copyright (c) 2014 Web In Dream. All rights reserved.
    //

    import UIKit

    //Step 1: Add protocol names that we will be delegating.

    class ViewController: UIViewController, UITextFieldDelegate, NSURLConnectionDelegate, NSXMLParserDelegate {

    @IBOutlet weak var txtCelsius : UITextField!
    @IBOutlet weak var txtFahrenheit : UITextField!

    var mutableData:NSMutableData = NSMutableData.init()
    var currentElementName:NSString = “”

    @IBAction func actionConvert(sender : AnyObject) {
    //let celcius = txtCelsius.text!
    guard let celcius = txtCelsius.text where celcius != “” else {
    return
    }

    let soapMessage = “\(celcius)”

    let urlString = “http://www.w3schools.com/webservices/tempconvert.asmx?op=CelsiusToFahrenheit”

    let url = NSURL(string: urlString)

    let theRequest = NSMutableURLRequest(URL: url!)
    //var msgLength = String(countElements(soapMessage))

    theRequest.addValue(“text/xml; charset=utf-8”, forHTTPHeaderField: “Content-Type”)
    theRequest.addValue(“/(soapMessage.characters.count)”, forHTTPHeaderField: “Content-Length”)
    theRequest.HTTPMethod = “POST”
    theRequest.HTTPBody = soapMessage.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false) // or false

    let connection = NSURLConnection(request: theRequest, delegate: self, startImmediately: true)
    connection!.start()

    }

    override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
    }

    // NSURLConnectionDelegate

    // NSURL

    func connection(connection: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
    mutableData.length = 0;
    }

    func connection(connection: NSURLConnection!, didReceiveData data: NSData!) {
    mutableData.appendData(data)
    }

    func connectionDidFinishLoading(connection: NSURLConnection!) {
    let xmlParser = NSXMLParser(data: mutableData)
    xmlParser.delegate = self
    xmlParser.parse()
    xmlParser.shouldResolveExternalEntities = true

    }

    // NSXMLParserDelegate

    func parser(parser: NSXMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
    currentElementName = elementName
    }

    func parser(parser: NSXMLParser, foundCharacters string: String) {
    //!!!if currentElementName == “CelsiusToFahrenheitResult” {
    txtFahrenheit.text = string
    //}
    }

    }

    Reply

  18. hmmm. That didn’t paste correctly. The line:
    let soapMessage = “…
    should be as it was in the original code, not what shows in my post above.

    Reply

  19. Thanks for the tutorial,really help for beginner learning at SOAP Web service.But the problem is can you update this to latest swift 2.1 and NSURLConnection can’t use at iOS 9.So,Can u update this tutorial in NSURLSession?Thanks.With Regards…

    Reply

  20. Hello
    I got information at your blog. thanks
    I try to this code running at Xcode7/iOS9/swift2 but it is not running
    so Did you tried to swift2?

    Reply

  21. I m having same problem as hans
    var mutableData : Void = NSMutableData.initialize() is not in swift 2.0 allowed
    please do help

    Reply

  22. Xcode 7.3.
    //
    // ViewController.swift
    //
    // Created by Linh Dao on 4/25/16.
    // Copyright © 2016 Linh Dao. All rights reserved.
    //

    import UIKit

    class ViewController: UIViewController, NSURLConnectionDataDelegate, NSXMLParserDelegate, UITextFieldDelegate {

    var mutableData:NSMutableData = NSMutableData.init()
    var currentElementName = “”
    @IBOutlet weak var txtFah: UITextField!
    @IBOutlet weak var txtCel: UITextField!
    override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
    }

    func getFarenheit(celsius celsius: Int) {
    let soapMessage = “\(celsius)”
    let urlString = “http://www.w3schools.com/xml/tempconvert.asmx”
    if let url = NSURL(string: urlString) {
    let theRequest = NSMutableURLRequest(URL: url)
    theRequest.addValue(“text/xml; charset=utf-8”, forHTTPHeaderField: “Content-Type”)
    theRequest.addValue((soapMessage), forHTTPHeaderField: “Content-Length”)
    theRequest.HTTPMethod = “POST”
    theRequest.HTTPBody = soapMessage.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
    let connection = NSURLConnection(request: theRequest, delegate: self, startImmediately: true)
    connection?.start()
    if connection == true {
    var mutableData:Void = NSMutableData.initialize()
    }
    NSLog(“anc %@”, theRequest)
    }
    }

    @IBAction func btnConvert(sender: AnyObject) {

    getFarenheit(celsius: Int(txtCel.text!)!)

    }
    func connection(connection: NSURLConnection, didReceiveResponse response: NSURLResponse) {
    mutableData.length = 0
    }

    func connection(connection: NSURLConnection, didReceiveData data: NSData) {
    mutableData.appendData(data)
    }
    func connectionDidFinishLoading(connection: NSURLConnection) {
    let response = NSString(data: mutableData, encoding: NSUTF8StringEncoding)
    let xmlParse = NSXMLParser(data: mutableData)
    xmlParse.delegate = self
    xmlParse.parse()
    xmlParse.shouldResolveExternalEntities = true
    print(“loaded”)
    }

    func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
    currentElementName = elementName
    print(“2”)
    }

    func parser(parser: NSXMLParser, foundCharacters string: String) {

    NSLog(“accc %@”, string)
    if currentElementName == “CelsiusToFahrenheitResult” {
    txtFah.text = string

    }

    }

    }

    Reply

  23. Make following small changes for the downloaded project to work with Swift 2.2.1 in xCode 7.3.1:

    command , Text Editing
    click line numbers if you have none.
    Then these small changes in file ViewController.swift:

    line 22 change celcius to celsius

    line 25 change string
    to …” + String(celsius!) + “…

    line 42, comment out
    line 44, comment out

    line 87, comment out
    line 89, comment out

    Reply

    1. Hi, here is the code for Xcode 8 swift 3,

      In Swift 3 there are a few changes, for example the use of URLSession instead of NSURLConnection. Other problem was the refresh of text field fahrenheit, for this i used:
      DispatchQueue.main.async {
      self.txtFahrenheit.text = string
      }
      All code:
      class ViewController: UIViewController, UITextFieldDelegate, XMLParserDelegate, URLSessionDataDelegate, URLSessionDelegate {

      @IBOutlet weak var txtCelcius: UITextField!
      @IBOutlet weak var txtFahrenheit: UITextField!
      var mutableData:NSMutableData = NSMutableData.init()
      var currentElementName:NSString = “”

      @IBAction func actionConvertir(_ sender: AnyObject) {
      let session = URLSession.shared // Load configuration into Session
      let celcius = txtCelcius.text
      let soapMessage = “\(celcius!)”
      let urlString = “http://www.w3schools.com/xml/tempconvert.asmx”
      let myUrl = URL(string: urlString);
      var theRequest = URLRequest(url:myUrl!)
      let msgLength = String(soapMessage.characters.count)

      theRequest.addValue(“text/xml; charset=utf-8”, forHTTPHeaderField: “Content-Type”)
      theRequest.addValue(msgLength, forHTTPHeaderField: “Content-Length”)

      theRequest.httpMethod = “POST”
      theRequest.httpBody = soapMessage.data(using: String.Encoding.utf8, allowLossyConversion: false)

      let task = session.dataTask(with: theRequest as URLRequest) {
      data, response, error in

      if error != nil {
      guard error == nil else {
      print(“error : \(error)”)
      return
      }}
      let strData = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
      print(strData)
      let myparser = XMLParser(data: data!)
      myparser.delegate = self
      myparser.parse()
      myparser.shouldResolveExternalEntities = true
      }

      task.resume()
      }

      func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
      print(“————–parser1————–“)
      currentElementName = elementName as NSString
      }

      func parser(_ parser: XMLParser, foundCharacters string: String) {
      print(“————-parser2—————“)
      if currentElementName == “CelsiusToFahrenheitResult” {
      DispatchQueue.main.async {
      self.txtFahrenheit.text = string
      }
      }
      }

      override func viewDidLoad() {
      super.viewDidLoad()
      // Do any additional setup after loading the view, typically from a nib.
      }

      override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated.
      }
      }

      Reply

  25. Here’s the code I wound up with. I converted to Swift 3 and URLSession instead of NSURLConnection:

    ////////////////////////////////////////////////////////////////////////////////
    var mutableData:NSMutableData = NSMutableData.init()
    var currentElementName:NSString = “”
    var soapSession = Foundation.URLSession(configuration: URLSessionConfiguration.default)
    @IBOutlet weak var txtCelsius: NSTextField!
    @IBOutlet weak var txtFahrenheit: NSTextField!
    @IBAction func actionConvert(_ sender: AnyObject) {
    let celsius = txtCelsius.stringValue

    let soapMessage = “\(celsius)”

    let urlString = “http://www.w3schools.com/xml/tempconvert.asmx”
    let url = Foundation.URL(string: urlString)
    let theRequest = NSMutableURLRequest(url: url!)
    let msgLength = soapMessage.characters.count
    theRequest.addValue(“application/soap+xml; charset=utf-8”, forHTTPHeaderField: “Content-Type”)
    theRequest.addValue(String(msgLength), forHTTPHeaderField: “Content-Length”)
    theRequest.httpMethod = “POST”
    theRequest.httpBody = soapMessage.data(using: String.Encoding.utf8, allowLossyConversion: false) // or false
    let task = soapSession.dataTask(with: theRequest as URLRequest, completionHandler: { (returnedData : Data?, response : URLResponse?, error : Error?) -> Void in
    guard error == nil
    else {
    print(“Error: URL Session Task Failed: \(error!.localizedDescription)”)
    return
    }
    let xmlParser = XMLParser(data: returnedData!)
    xmlParser.delegate = self
    xmlParser.parse()
    xmlParser.shouldResolveExternalEntities = true
    })
    task.resume()
    }

    func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
    currentElementName = elementName as NSString
    }

    func parser(_ parser: XMLParser, foundCharacters string: String) {
    if currentElementName == “CelsiusToFahrenheitResult” {
    DispatchQueue.main.async {
    self.txtFahrenheit.stringValue = string
    }
    }
    }
    ////////////////////////////////////////////////////////////////////////////////

    I still don’t understand the XMLParser parts. Planning to work on that next.

    Reply

    1. Wow. The “soapMessage” in that code got different. It’s the same as in the original code above, just with escaped quotes instead of single ticks.

      Reply

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