ios - 在 SWIFT 中调用 SOAP 服务

Question

我尝试在 SWIFT 代码中调用临时转换器服务，但是，我在控制台中得到相同的 println“否”:

import UIKit

class ViewController: UIViewController {

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

        var is_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/webservices/'><Celsius>0</Celsius></CelsiusToFahrenheit></soap:Body></soap:Envelope>"



            var is_URL: String = "http://www.w3schools.com/webservices/CelsiusToFahrenheit"

            var lobj_Request = NSMutableURLRequest(URL: NSURL(string: is_URL)!)
            var session = NSURLSession.sharedSession()
            var err: NSError?

        /*

            lobj_Request.HTTPMethod = "POST"
            lobj_Request.HTTPBody = is_SoapMessage.dataUsingEncoding(NSUTF8StringEncoding)
            lobj_Request.addValue("testest.it", forHTTPHeaderField: "Host")
            lobj_Request.addValue("text/xml; charset=utf-8", forHTTPHeaderField: "Content-Type")
            lobj_Request.addValue(String(count(is_SoapMessage)), forHTTPHeaderField: "Content-Length")
            lobj_Request.addValue("http://www.w3schools.com/webservices/CelsiusToFahrenheit", forHTTPHeaderField: "SOAPAction")

*/
        var msgLength = String(count(is_SoapMessage))


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

            /*
            var task = session.dataTaskWithRequest(lobj_Request, completionHandler: {data, response, error -> Void in
                println("Response: \(response)")
                var strData = NSString(data: data, encoding: NSUTF8StringEncoding)
                println("Body: \(strData)")




                if error != nil
                {
                    println("Error: " + error.description)
                }
                else
                {
                    println("OKAY")
                }
            })

            task.resume()

*/

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

        if (connection == true) {
            var mutableData : Void = NSMutableData.initialize()
            println("OKAY")
        }
        else
        {
            println("NO")
        }

    }

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


}

我看不出错误在哪里，我没有出现错误的行。我试图理解为什么我无法收到"is"消息，有人可以帮助我吗？

Answer 1

connection 不是 Bool 类型，因此 connection == true 总是会得到 falso。这就像问香蕉是不是苹果一样。显而易见的答案永远是“假”

要检查连接对象是否已分配，您应该检查它是否不为零，因此 if 应该是 if connection != nil 这并不能确保您“调用正常”，例如你在评论中说。它只会确保连接对象已成功创建，并且您应该在调用连接对象的 start 方法之前检查它。 (并且您实际上不需要调用 start 方法，因为您将 true 作为立即启动参数)

if let connection = NSURLConnection(request: lobj_Request, delegate: self, startImmediately: true) {
    connection.start() //You don't need it because you set the startImmediately param to true
    //whatever you want to do the connection
}