Question

这是我看到的通常的JSON：

{"employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter", "lastName":"Jones"}
]}

但是我试图解析这种JSON格式，没有对象（上面例子中的“雇员”）：

[{"id":"1","company":"1","facility":"2","starttime":"1454936400","complete_time":"1454979600","scheduled_hours":"12"},{"id":"3","company":"1","facility":"2","starttime":"1455021660","complete_time":"1455061660","scheduled_hours":"12"}]

这是我正在尝试使用的代码：

 let requestURL: NSURL = NSURL(string: url)!
        let urlRequest: NSMutableURLRequest = NSMutableURLRequest(URL: requestURL)
        let session = NSURLSession.sharedSession()
        let task = session.dataTaskWithRequest(urlRequest) {
            (data, response, error) -> Void in

            let httpResponse = response as! NSHTTPURLResponse
            let statusCode = httpResponse.statusCode

            if (statusCode == 200) {

                do{

                    let json = try NSJSONSerialization.JSONObjectWithData(data!, options:.AllowFragments)

                    if let stations = json[1] as? [[String: AnyObject]] {
                        print(json)
                        for station in stations {

                            if let name = station["company"] as? String {
                               print(name)

                            }
                        }

                    }

                }catch {
                    print("Error with Json: \(error)")

                }

            }

        }

        task.resume()

但是我无法输出JSON数据中的任何值。我该怎么做？我是Swift和XCode的新手。

或者，如果我可以将我的数据格式化为第一个JSON，那么它会好吗？数据从SQL查询作为数组返回。

更新：当我打印（json [1]）时，它只打印第二组。我想我越来越近了。

Answer 1

NSJSONSerialization.JSONObjectWithData可能很棘手，因为它可以返回Array又名[AnyObject]或Dictionary又名[String: AnyObject]。

然后你必须测试结果是什么：

let jsonData = try NSJSONSerialization.JSONObjectWithData(data!, options:.AllowFragments)
if let json = jsonData as? [[String: AnyObject]] {
    // json starts with an array
    for value in json {
        // loop through array
    }
} else if let json = jsonData as? [String: AnyObject] {
    // json starts with a key
    for (key, value) in json {
       // loop through dictionary key/values
    }
} else {
    // This json is broken
}

Answer 2

1 - 检查statusCode条件是否为真（200或“200”？）

尝试捕获之前的2个打印数据

if (statusCode == 200) {
    print(data)
            do{
               ......
              }

3-打印json对象

do{

  let json = try NSJSONSerialization.JSONObjectWithData(data!, options:.AllowFragments)
  print(json)

和

4-check json [1]与[[String：AnyObject]]

相同

解析没有对象名称的JSON

2 个答案: