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ios - 无法将数据转换为字典

问题描述

我有一个 JSONObject，我想将它转换为它的类。

我尝试使用 JSONSerialization.data(withJSONObject: data, options: [] 并将其编码为 .utf8 String 但没有成功......


 socket.on("privateMessage") {data, ack in

            print("privateMessage :\(data[0])");

            guard let jsonData = try? JSONSerialization.data(withJSONObject: data, options: []) else {return}

结果：

(lldb) po data
▿ 1 element
  - 0 : {"emisor":105,"receptor":54,"receptor_token":"7ec66175309aac4cbeda0c9936991cfdfcad8445fdcff583524d940c7e0ee4669488675c214823e0","texto":"Dshfljkhdlsafh","updated_at":"2019-06-20 16:38:30","created_at":"2019-06-20 16:38:30","id":10056,"time":"16:38:30"}

(lldb) po jsonData
▿ 282 bytes
  - count : 282
  ▿ pointer : 0x00007f917289f000
    - pointerValue : 140262668627968

标签： iosjsonswiftcasting

解决方案

这是一种非常不寻常的响应格式，从注释中的输出来看，它是一个未指定的数组 ( [Any])，其中包含一个 JSON 字符串，如下所示

let json = """
{"emisor":105,"receptor":54,"receptor_token":"6b6295e0b0601146e56ff4a9caec287f0ecc0f385fcfcd758dccd00c6385c558eefc6d6fbe98e977","texto":"Blanca bla","updated_at":"2019-06-21 10:48:22","created_at":"2019-06-21 10:48:22","id":10074,"time":"10:48:22"}
"""

let data : [Any] = [json]

首先为了方便声明一个结构

struct Response: Decodable {
    let emisor, receptor, id: Int
    let receptorToken, texto, updatedAt, createdAt, time: String
}

解析 JSON 检查是否data是一个数组，如果数组中有一个字符串，成功时将其转换为Data并解码Decodable

socket.on("privateMessage") {data, ack in
    if let response = data as? [Any], let jsonString = response.first as? String {
       let jsonData = Data(jsonString.utf8)
       do {
           let decoder = JSONDecoder()
           decoder.keyDecodingStrategy = .convertFromSnakeCase
           let result = try decoder.decode(Response.self, from: jsonData)
           print(result)
       } catch {
           print(error)
       }
   }
}

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