Swift通过POST PHP服务器发送JSON数据服务器

Question

当我使用Swift通过POST JSON向服务器提供数据时，我会收到致命的错误：

  

在解包可选值时意外地发现了nil。

我不确定我是否传递JSON库字典，或者在发送到服务器时是否有问题，因为我无权查看服务器PHP代码。

我不知道如何

NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as! NSArray

的工作原理。

我用

创建我的JSON字典

func parseExportDB() -> [AnyObject]{

    var exportDict: [AnyObject] = []

    for tuple in export {
        var dictObj = [
            "PhoneID": "petrjanata",
            "LocLabel": tuple[crosslocation],
            "Latitude": "123",
            "Longitude": "-123",
            "time" : tuple[time],
            "heading" : tuple[heading]
        ]
        exportDict.append(dictObj)
        println(dictObj)
    }

    return exportDict
}

我接受exportDict JSON数组对象并传入此函数：

func sendJsonToServer(ExportList: AnyObject){

    var request = NSMutableURLRequest(URL: NSURL(string: "http://atonal.ucdavis.edu/geomus/submit_data.php")!)

    var session = NSURLSession.sharedSession()
    request.HTTPMethod = "POST"

    var err: NSError?
    if let serializedData = NSJSONSerialization.dataWithJSONObject(ExportList, options: nil, error: &err){
        request.HTTPBody = serializedData
        println(request.HTTPBody)
    }
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")

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

        let jsonString = self.JSONStringify(ExportList)
        println(jsonString)

        var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as! NSArray
        // var json = noWrappedJson!
        // Did the JSONObjectWithData constructor return an error? If so, log the error to the console
        if(err != nil) {
            println(err!.localizedDescription)
            let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
            println("Error could not parse JSON: '\(jsonStr)'")
        }
        else {
            // The JSONObjectWithData constructor didn't return an error. But, we should still
            // check and make sure that json has a value using optional binding.
            for singleCode in json {
                if let parseJSON = singleCode as? NSDictionary {
                    // Okay, the parsedJSON is here, let's get the value for 'success' out of it
                    var success = parseJSON["code"] as? String
                    println("Succes: \(success)")
                }
                else {
                    // Woa, okay the json object was nil, something went worng. Maybe the server isn't running?
                    let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
                    println("Error could not parse JSON: \(jsonStr)")
                }
            }
        }

    })

    task.resume()
}

代码输入致命错误：

  

在解包可选值时意外发现nil

var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as! NSArray

有错误

我不确定如何解决，或者JSON格式或服务器到底出了什么问题？