How do I call a SOAP web service in Swift 2?

Question

I want to call web service for Swift 2. But it never works. This is my code.

import UIKit

class ViewController: UIViewController, UITextFieldDelegate, NSURLConn         


        

Answer 1

NSURLConnection is deprecated, use NSURLSession instead.

Here's an example of a function doing what you want with NSURLSession and a callback:

func getFarenheit(celsius celsius: Int, completion: (result: String) -> Void) {
    let soapMessage = "<?xml version='1.0' encoding='utf-8'?><soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'><soap:Body><CelsiusToFahrenheit xmlns='http://www.w3schools.com/xml/'><Celsius>\(celsius)</Celsius></CelsiusToFahrenheit></soap:Body></soap:Envelope>"
    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)
        NSURLSession.sharedSession().dataTaskWithRequest(theRequest) { (data, response, error) in
            if error == nil {
                if let data = data, result = String(data: data, encoding: NSUTF8StringEncoding) {
                    completion(result: result)
                }
            } else {
                print(error!.debugDescription)
            }
        }.resume()
    }
}

Use it like this with a "trailing closure":

getFarenheit(celsius: 42) { (result) in
    print(result)
}

It prints the data containing the XML and the converted value:

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><CelsiusToFahrenheitResponse xmlns="http://www.w3schools.com/xml/"><CelsiusToFahrenheitResult>107.6</CelsiusToFahrenheitResult></CelsiusToFahrenheitResponse></soap:Body></soap:Envelope>