json - swift 3 中的 ResponseCollectionSerializable

Question

我是 Swift 的新手，无法弄清楚如何将 JSON 数组反序列化为 Swift 对象数组。我能够很好地将单个 JSON 用户反序列化为 Swift channel 对象，但不确定如何使用 JSON channel 数组执行此操作。

我的 ResponseCollectionSerializable.swift

import Foundation
import Alamofire

public protocol ResponseObjectSerializable {
    init?(response: HTTPURLResponse, representation: AnyObject)
}

extension Request {
    public func responseObject<T: ResponseObjectSerializable>(completionHandler: Response<T, NSError> -> Void) -> Self {
        let responseSerializer = DataResponseSerializer<T, NSError> { request, response, data, error in
            guard error == nil else { return .Failure(error!) }

            let JSONResponseSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
            let result = JSONResponseSerializer.serializeResponse(request, response, data, error)

            switch result {
            case .Success(let value):
                if let
                    response = response,
                    let responseObject = T(response: response, representation: value)
                {
                    return .Success(responseObject)
                } else {
                    let failureReason = "JSON could not be serialized into response object: \(value)"
                    let error = Error.errorWithCode(.JSONSerializationFailed, failureReason: failureReason)
                    return .Failure(error)
                }
            case .Failure(let error):
                return .Failure(error)
            }
        }

        return response(responseSerializer: responseSerializer, completionHandler: completionHandler)
    }
}

public protocol ResponseCollectionSerializable {
    static func collection(response: HTTPURLResponse, representation: AnyObject) -> [Self]
}

extension Alamofire.Request {
    public func responseCollection<T: ResponseCollectionSerializable>(completionHandler: Response<[T], NSError> -> Void) -> Self {
        let responseSerializer = DataResponseSerializer<[T], NSError> { request, response, data, error in
            guard error == nil else { return .Failure(error!) }

            let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
            let result = JSONSerializer.serializeResponse(request, response, data, error)

            switch result {
            case .Success(let value):
                if let response = response {
                    return .Success(T.collection(response: response, representation: value))
                } else {
                    let failureReason = "Response collection could not be serialized due to nil response"
                    let error = Error.errorWithCode(.JSONSerializationFailed, failureReason: failureReason)
                    return .Failure(error)
                }
            case .Failure(let error):
                return .Failure(error)
            }
        }

        return response(responseSerializer: responseSerializer, completionHandler: completionHandler)
    }
}

我有一个问题:使用未声明的类型“响应”通用类型“DataResponseSerializer”特化了太多类型参数(得到 2 个但预期有 1 个)

enter image description here

我的模型:

import Foundation
import ObjectMapper
import SwiftyJSON

class AllCnannelModel : ResponseObjectSerializable, ResponseCollectionSerializable{

    var id : Int
    var  name: String
    var  url : String
    var  picture : String
    var  category_id: Int

    public required init?(response: HTTPURLResponse, representation: AnyObject) {
        self.id = representation["id"] as! Int
        self.name = representation["name"] as! String
        self.url = representation["url"] as! String
        self.picture = representation["picture"] as! String
        self.category_id = representation["category_id"] as! Int
    }

    class func collection(response: HTTPURLResponse, representation: AnyObject) -> [AllCnannelModel] {
        let postArray = representation as! [AnyObject]

        return postArray.map({ AllCnannelModel(response:response, representation: $0)! })
    }

}

问题:

enter image description here

Answer 1

此答案以 the approach that the SwiftyJSON GitHub readme recommends 开头用于从 Alamofire 响应构建 SwiftyJSON 对象。该问题不包括下面显示的 Alamofire.request() 调用的等价物。这消除了对问题中某些方法的需要。

Alamofire.request("(put the URL here)", method: .get).validate().responseJSON { response in

    switch response.result {
    case .success(let value):

        let json = JSON(value)
        print("JSON: \(json)")

        if let array = json.array {
            var channelArray: [AllCnannelModel] = []
            for item in array {
                guard let dictionary = item.dictionaryObject else {
                    continue
                }
                if let channel = AllCnannelModel(representation: dictionary) {
                    channelArray.append(channel)
                }
            }
            // Do something with channelArray
        }

    case .failure(let error):
        print(error)
    }
}

AllCnannelModel 初始化程序已被修改为接受字典，[String: Any]。

class AllCnannelModel {

    var id : Int
    var  name: String
    var  url : String
    var  picture : String
    var  category_id: Int

    public required init?(representation: [String: Any]) {
        self.id = representation["id"] as! Int
        self.name = representation["name"] as! String
        self.url = representation["url"] as! String
        self.picture = representation["picture"] as! String
        self.category_id = representation["category_id"] as! Int
    }
}