Question

这是我的JSON响应值：

 {
   "_embedded": {
    "task": [
        {
            "_embedded": {
                "variable": [
                    {
                        "_links": {
                            "self": {
                                "href": "/process-instance/412a03b7-06ae-11ea-8860-120ef5ab2c25/variables/loanAmount"
                            }
                        },
                        "_embedded": null,
                        "name": "loanAmount",
                        "value": "650000",
                        "type": "String",
                        "valueInfo": {}
                    }
                ]
            },
            "id": "412a2aca-06ae-11ea-8860-120ef5ab2c25",
            "name": "Quick Evaluation",
            "assignee": "demo",
            "created": "2019-11-14T07:13:27.558+0000",
            "processDefinitionId": "quickEvaluation:1:129ce2b1-0616-11ea-8860-120ef5ab2c25"

        }

    ]
},
 "count": 13
}

这是结构可编码代码：

import Foundation

public struct TaskID: Codable {
    let embedded: Embedded
}

public struct Embedded: Codable {
    let task: [Task]
}

public struct Task : Codable {

    let embedded: EmbeddedVariable
    let id : String
    let name: String
    let assignee: String
    let created: String
    let processDefinitionId: String
}

public struct EmbeddedVariable: Codable {

    let variable : [Variables]
}

public struct Variables: Codable {

    let value : String
    let name: String
}

我尝试过encodingKey，也尝试使用_embedded。面对同样的问题。

错误日志：由于错误而无法解码响应：

 Alamofire.AFError.
 ResponseSerializationFailureReason.decodingFailed(error: Swift.DecodingError.typeMismatch(Swift.Dictionary<Swift.String, Any>, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Dictionary<String, Any> but found an array instead.", underlyingError: nil)))))

由于数据格式不正确，因此无法读取。

这是JSONSerialization的代码：

      // MARK: - URLRequestConvertible
func asURLRequest() throws -> URLRequest {
    let url = try K.ProductionServer.baseURL.asURL()

    var urlRequest = URLRequest(url: url.appendingPathComponent(path))
    print(urlRequest)
    // HTTP Method
    urlRequest.httpMethod = method.rawValue

    let authToken = UserDefaults.standard.string(forKey: "authToken")
    let bearerToken: String = "Bearer " + (authToken ?? "")
    print("baearer token::\(bearerToken)")

    // Common Headers
    urlRequest.setValue(ContentType.json.rawValue, forHTTPHeaderField: HTTPHeaderField.acceptType.rawValue)
    urlRequest.setValue(ContentType.json.rawValue, forHTTPHeaderField: HTTPHeaderField.contentType.rawValue)
    urlRequest.setValue(bearerToken, forHTTPHeaderField: HTTPHeaderField.authentication.rawValue)

    // Parameters
    if let parameters = parameters {
        do {
            urlRequest.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: [])
        } catch {
            throw AFError.parameterEncodingFailed(reason: .jsonEncodingFailed(error: error))
        }
    }

    return urlRequest
}

这是代码json返回响应：

   import Foundation
  import Alamofire

public class APIClient {
@discardableResult
private static func performRequest<T:Decodable>(route:APIRouter, decoder: JSONDecoder = JSONDecoder(), completion:@escaping (AFResult<T>)->Void) -> DataRequest {

    return AF.request(route)
                    .responseDecodable (decoder: decoder){ (response: AFDataResponse<T>) in
                        completion(response.result)
                        print("framework response::",response.result)
    }
}

public static func taskID(id: String, completion:@escaping (AFResult<MyTaskData>)->Void) {

    performRequest(route: APIRouter.TaskById(id: id), completion: completion)
}


}//APIClient

Answer 1

在您的JSON有效负载中，键 processDefinitionId 的值的末尾有一个逗号。

请尝试使用此JSON格式化程序工具来验证JSON：jsonformatter

"task":[
        {
         //...

         "id": "412a2aca-06ae-11ea-8860-120ef5ab2c25",
         "name": "Quick Evaluation",
         "assignee": "demo",
         "created": "2019-11-14T07:13:27.558+0000",
         "processDefinitionId": "quickEvaluation:1:129ce2b1-0616-11ea-8860-120ef5ab2c25", // remove this coma(,) from this line

        }

更新：

将CodingKey用作_embedded。尝试以下方式

// MARK: - TaskID
struct TaskID: Codable {
    let embedded: Embedded
    let count: Int

    enum CodingKeys: String, CodingKey {
        case embedded = "_embedded"
        case count
    }
}

// MARK: - Embedded
struct Embedded: Codable {
    let task: [Task]
}

// MARK: - Task
struct Task: Codable {
    let embedded: EmbeddedVariable
    let id, name, assignee, created: String
    let processDefinitionID: String

    enum CodingKeys: String, CodingKey {
        case embedded = "_embedded"
        case id, name, assignee, created
        case processDefinitionID = "processDefinitionId"
    }
}

// MARK: - EmbeddedVariable
struct EmbeddedVariable: Codable {
    let variable: [Variable]
}

// MARK: - Variable
struct Variable: Codable {
    let links: Links
    let name, value, type: String
    let valueInfo: ValueInfo

    enum CodingKeys: String, CodingKey {
        case links = "_links"
        case name, value, type, valueInfo
    }
}

// MARK: - Links
struct Links: Codable {
    let linksSelf: SelfClass

    enum CodingKeys: String, CodingKey {
        case linksSelf = "self"
    }
}

// MARK: - SelfClass
struct SelfClass: Codable {
    let href: String
}

// MARK: - ValueInfo
struct ValueInfo: Codable {
}

Answer 2

如何将可编码结构中的所有embeded更改为_embeded？

在您的APIClient类中，默认创建的JSONDecoder实例。并且在解码包括下划线时不会更改键名。

JSONDecoder.KeyDecodingStrategy.useDefaultKeys策略是未指定的策略。 Documentation from Apple

代码

public struct TaskID: Codable {
    let _embedded: Embedded
}

public struct Task : Codable {

    let _embedded: EmbeddedVariable
    let id : String
    let name: String
    let assignee: String
    let created: String
    let processDefinitionId: String
}

Answer 3

尝试使用QuickType.io

// MARK: - Welcome
struct Welcome: Codable {
    let embedded: WelcomeEmbedded
    let count: Int

    enum CodingKeys: String, CodingKey {
        case embedded = "_embedded"
        case count
    }
}

要解析Alamofire响应中的值：

   Alamofire.request(url).responseWelcomeEmbedded { response in
     if let welcomeEmbedded = response.result.value {
       ...
     }
   }

// MARK: - WelcomeEmbedded
struct WelcomeEmbedded: Codable {
    let task: [Task]
}

要解析Alamofire响应中的值：

   Alamofire.request(url).responseTask { response in
     if let task = response.result.value {
       ...
     }
   }

// MARK: - Task
struct Task: Codable {
    let embedded: TaskEmbedded
    let id, name, assignee, created: String
    let processDefinitionID: String

    enum CodingKeys: String, CodingKey {
        case embedded = "_embedded"
        case id, name, assignee, created
        case processDefinitionID = "processDefinitionId"
    }
}

要解析Alamofire响应中的值：

   Alamofire.request(url).responseTaskEmbedded { response in
     if let taskEmbedded = response.result.value {
       ...
     }
   }

// MARK: - TaskEmbedded
struct TaskEmbedded: Codable {
    let variable: [Variable]
}

要解析Alamofire响应中的值：

   Alamofire.request(url).responseVariable { response in
     if let variable = response.result.value {
       ...
     }
   }

// MARK: - Variable
struct Variable: Codable {
    let links: Links
    let embedded: JSONNull?
    let name, value, type: String
    let valueInfo: ValueInfo

    enum CodingKeys: String, CodingKey {
        case links = "_links"
        case embedded = "_embedded"
        case name, value, type, valueInfo
    }
}

要解析Alamofire响应中的值：

   Alamofire.request(url).responseLinks { response in
     if let links = response.result.value {
       ...
     }
   }

// MARK: - Links
struct Links: Codable {
    let linksSelf: SelfClass

    enum CodingKeys: String, CodingKey {
        case linksSelf = "self"
    }
}

To parse values from Alamofire responses:

   Alamofire.request(url).responseSelfClass { response in
     if let selfClass = response.result.value {
       ...
     }
   }

// MARK: - SelfClass
struct SelfClass: Codable {
    let href: String
}

要解析Alamofire响应中的值：

   Alamofire.request(url).responseValueInfo { response in
     if let valueInfo = response.result.value {
       ...
     }
   }

// MARK: - ValueInfo
struct ValueInfo: Codable {
}

// MARK: - Helper functions for creating encoders and decoders

func newJSONDecoder() -> JSONDecoder {
    let decoder = JSONDecoder()
    if #available(iOS 10.0, OSX 10.12, tvOS 10.0, watchOS 3.0, *) {
        decoder.dateDecodingStrategy = .iso8601
    }
    return decoder
}

func newJSONEncoder() -> JSONEncoder {
    let encoder = JSONEncoder()
    if #available(iOS 10.0, OSX 10.12, tvOS 10.0, watchOS 3.0, *) {
        encoder.dateEncodingStrategy = .iso8601
    }
    return encoder
}

// MARK: - Alamofire response handlers

extension DataRequest {
    fileprivate func decodableResponseSerializer<T: Decodable>() -> DataResponseSerializer<T> {
        return DataResponseSerializer { _, response, data, error in
            guard error == nil else { return .failure(error!) }

            guard let data = data else {
                return .failure(AFError.responseSerializationFailed(reason: .inputDataNil))
            }

            return Result { try newJSONDecoder().decode(T.self, from: data) }
        }
    }

    @discardableResult
    fileprivate func responseDecodable<T: Decodable>(queue: DispatchQueue? = nil, completionHandler: @escaping (DataResponse<T>) -> Void) -> Self {
        return response(queue: queue, responseSerializer: decodableResponseSerializer(), completionHandler: completionHandler)
    }

    @discardableResult
    func responseWelcome(queue: DispatchQueue? = nil, completionHandler: @escaping (DataResponse<Welcome>) -> Void) -> Self {
        return responseDecodable(queue: queue, completionHandler: completionHandler)
    }
}

Answer 4

这是Alamofire的基本要求。如果使用以下解析json的结构，应该没有错误。

    Alamofire.request(url, headers: headers).responseJSON { response in
        switch response.result {
        case .success(let value):
            let jsonData = value as! NSDictionary
            completionHandler(jsonData, nil)
            print("****** JSON \(jsonData)")
        case .failure(let error):
            completionHandler(nil, error)
        }

在这里，我将其放置在您的代码中。您应该尝试如下所示的标题。您需要填写适当的标题。

func asURLRequest() throws -> URLRequest {
    let url = try K.ProductionServer.baseURL.asURL()

    var urlRequest = URLRequest(url: url.appendingPathComponent(path))
    print(urlRequest)
    // HTTP Method
    urlRequest.httpMethod = method.rawValue

    let authToken = UserDefaults.standard.string(forKey: "authToken")
    let bearerToken: String = "Bearer " + (authToken ?? "")
    print("baearer token::\(bearerToken)")

    // Common Headers
    //urlRequest.setValue(ContentType.json.rawValue, forHTTPHeaderField: 
    //HTTPHeaderField.acceptType.rawValue)
    //urlRequest.setValue(ContentType.json.rawValue, forHTTPHeaderField: 
    //HTTPHeaderField.contentType.rawValue)
    //urlRequest.setValue(bearerToken, forHTTPHeaderField: 
    //HTTPHeaderField.authentication.rawValue)

    let headers: HTTPHeaders = [
        "Content-Type": "application/json",
        "Authorization": "Basic " + currentToken
    ]

    Alamofire.request(url, headers: headers).responseJSON { response in
        switch response.result {
        case .success(let value):
            let jsonData = value as! NSDictionary
            completionHandler(jsonData, nil)
            print("****** JSON \(jsonData)")
        case .failure(let error):
            completionHandler(nil, error)
        }

//return urlRequest
}

希望这有帮助

swift parse json-由于数据格式不正确，因此无法读取

4 个答案:

代码