如果我尝试将其转换为其他任何内容，JSON 序列化将返回 nil

Question

我在解析这个 json 对象时遇到问题。我能够将它解析为 Any 。但如果我尝试将其转换为 NSDictionary 或其他任何内容，它会返回 nil。谁能帮我？我咨询了几个问题，它们都给出了相同的零结果。

    let task = URLSession.shared.dataTask(with: request) { data, response, error in
    if let reponse = response {
        print(reponse)
    }
    if let data = data {
        //print(data)

        do{

          //  let json = try JSONSerialization.jsonObject(with: data, options: [])


            let json = try JSONSerialization.jsonObject(with: data, options:.allowFragments)

                // do stuff here

            //  accountJson = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? NSDictionary

            print("\(json)") // This one prints .

            let accountJson = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? NSDictionary

            print("trying to print accountjson")
            print("\(accountJson)") // this one doesnt. 




        } catch {
            print(error)
        }

    }

}
task.resume()

第一个 print 语句起作用并在终端中生成以下代码。

(
    {
    "__v" = 0;
    "_id" = 59cba54406e2661530c1aa6e;
    pass = ra;
    type = ra;
    username = NikRa;
}
)

Answer 1

大家好，我确实弄清楚了。我必须将其转换为数组中的数组。

let accountJson = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as?  [[String: Any]]