带有 JSON 对象列表的 HTTP Post 请求 Swift 5

Question

您好，我正在使用 Swift 5 发出 HTTP POST 请求，该请求返回一个 JSON 对象列表，我认为这是导致我的错误的原因，我似乎找不到解决方案，因为我已经搜索了几乎每个示例可以在 stackoverflow 和 youtube 以及 Apple 的文档中找到，尽管这似乎是一个基本概念。 以下是我的回复：

[
        {
        "_id": "---------------",
        "phone_number": "xxx-xxx-xxx"
        "first_name": "Name",
        "last_name": "LastName",
        "gender": "Female",
        "verified": true
    },
    {
        "_id": "---------------",
        "phone_number": "xxx-xxx-xxx"
        "first_name": "Name",
        "last_name": "LastName",
        "gender": "Female",
        "verified": true
    }
]

我用来发出 HTTP 请求的代码是：

        let url = URL(string: "URLString")!
        let json: [String:Any] = ["phone_number":phoneNumber]
        let session = URLSession.shared
        var request = URLRequest(url: url)
        request.httpMethod = "POST"

        do{
            request.httpBody = try JSONSerialization.data(withJSONObject: json, options: .prettyPrinted)
        }catch let error {
            print(error.localizedDescription)
        }

        //HTTP Headers
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        request.addValue("application/json", forHTTPHeaderField: "Accept")

        //URL data task
        let task = session.dataTask(with: request) { (data, response, error) in
            guard error == nil else{
                print("Error!")
                return
            }
            guard let data = data else{
                print("Error fetching data")
                return
            }

            do {
                guard let responseJSON = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String:Any] else {
                    print("Unable to serialize response!") //FAILS HERE EVERY TIME
                    return
                }
                print(responseJSON)
                print("WOO made it!")
            }catch let error {
                print("Error with response!")
            }
        }
        task.resume()

我不确定到底是什么问题，但我已经指出它失败的地方，我已经尝试在转换之前打印出数据，只是为了确保它不是空的，它说像 2000 字节所以我知道它不是空的。我的猜测是存在问题，因为它采用对象列表的格式，而不是大多数示例所示的仅一个对象。有时，我的快速服务器端上的 HTTP 正文也为零，因此不确定我是否做错了那部分。但截至目前，我只想能够解析我的响应，所以我可以开始调试其余部分。感谢您的帮助。

Answer 1

您需要[[String:Any]] 而不是[String:Any]

guard let responseJSON = try JSONSerialization.jsonObject(with: data) as? [[String:Any]] else {
    print("Unable to serialize response!") //FAILS HERE EVERY TIME
    return
 }

但最好使用JSONDecoder

 do {
    let res = try JSONdecoder().decode([Root].self,from:data)
 }
 catch {
   print(error)
 }

---

正确的json

[
    {
        "_id": "---------------",
        "phone_number": "xxx-xxx-xxx",
        "first_name": "Name",
        "last_name": "LastName",
        "gender": "Female",
        "verified": true
    },
    {
        "_id": "---------------",
        "phone_number": "xxx-xxx-xxx",
        "first_name": "Name",
        "last_name": "LastName",
        "gender": "Female",
        "verified": true
    }
]

---

struct Root: Codable {
    let id, phoneNumber, firstName, lastName: String
    let gender: String
    let verified: Bool

    enum CodingKeys: String, CodingKey {
        case id = "_id"
        case phoneNumber = "phone_number"
        case firstName = "first_name"
        case lastName = "last_name"
        case gender, verified
    }
}