ios - json post 方法 Swift 中出现媒体类型不受支持的错误

Question

我是 swift 的新手，正在制作一个简单的应用程序，使用这个将摄氏度转换为华氏度:JSON WebService

我的代码在按钮 btn 操作上:

 @IBAction func btn(sender: AnyObject) {
    let celnum = txtfirld.text
    
    let myUrl = NSURL(string: "http://webservices.daehosting.com/services/TemperatureConversions.wso");
    print("pass 1")
    let request = NSMutableURLRequest(URL: myUrl!);
    request.HTTPMethod = "POST";
    print("pass 2")
    let postString = "nCelsius=\(celnum)"
    request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding);
    let task = NSURLSession.sharedSession().dataTaskWithRequest(request){
        data, response, error in
        
        print("pass 3")
        
        if error != nil {
            print("Error 1")
            return
        }
        let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
        print("responseString =  \(responseString)")
        
        do{
            let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableLeaves) as? NSDictionary
            if let parseJson = json{
                let resultValue = parseJson["status"] as! String!
                print("result:\(resultValue)")
                
                
            }
         
        } catch {print("Error 2")}   
 }
    
    task.resume()
    
 }

但它在控制台上给我这样的错误:

pass 1
pass 2
pass 3
responseString =  Optional(The server cannot service the request because the media type is unsupported.)
Error 2

请帮忙谢谢你:)

Answer 1

1 - 你应该设置你的请求内容类型:

request.setValue("application/json; charset=utf-8", forHeader:"Content-Type")

2 - 您的正文不是 JSON 格式，请使用:

let params = ["nCelscius" : 1212]
request.HTTPBody = NSJSONSerialization.dataWithJSONObject(params, options: NSJSONWritingOptions())