swift 3中的ResponseCollectionSerializable

Posted 2023-02-24

【中文标题】swift 3中的ResponseCollectionSerializable

【英文标题】：ResponseCollectionSerializable in swift 3

【发布时间】：2017-01-31 18:43:30

【问题描述】：

我是 Swift 新手，无法弄清楚如何将 JSON 数组反序列化为 Swift 对象数组。我能够将单个 JSON 用户反序列化为 Swift 通道对象，但只是不确定如何使用 JSON 通道数组来实现。

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” 泛型类型“DataResponseSerializer”专用于太多类型参数（有 2 个但预期为 1 个）

enter image description here

我的模特：

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

【参考方案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() 调用的等效项。这消除了对问题中某些方法的需求。

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