arrays - 序列化错误

Question

当我尝试继续解析 JSON 时收到此错误。有谁知道我需要做什么来解决它？

Error 1: Cannot subscript a value of type 'AudiobookJSON' (aka 'Array<Dictionary<String, Any>>') with an index of type 'String'

Error on Print

文件模型:Audiobook.swift:

import Foundation


struct Audiobook : Codable {
    let id: Int
    let descricao: String
    let urlImagem: String

    init(dictionary: AudiobookJSON) {
        self.id = dictionary["id"] as! Int//////ERROR MESSAGE ////////
        self.descricao = dictionary["descricao"] as! String/////ERROR MESSAGE
        self.urlImagem = dictionary["urlImagem"] as! String////ERROR MESSAGE
    }

}

文件夹网络:APIClient.swift:

import Foundation

typealias AudiobookJSON = [[String: Any]]

struct APIClient {

    static func getAudiobooksAPI(completion: @escaping ([Audiobook]?) -> Void) {

        let url = URL(string: "https://alodjinha.herokuapp.com/categoria")

        let session = URLSession.shared

        guard let unwrappedURL = url else { print("Error unwrapping URL"); return }

        let dataTask = session.dataTask(with: unwrappedURL) { (data, response, error) in

            guard let unwrappedDAta = data else { print("Error unwrapping data"); return }

            do {

                //let json = try JSONSerialization.jsonObject(with: unwrappedDAta, options: .allowFragments) as! [String:Any]
                //let posts = json["data"] as? AudiobookJSON
                let posts = try JSONDecoder().decode([Audiobook].self, from: unwrappedDAta)

                print(posts)



                completion(posts)

            } catch {
                print("Could not get API data. \(error), \(error.localizedDescription)")
            }
        }
        dataTask.resume()
    }
}

Answer 1

正如我所见，AudiobookJSON 是一个键值对数组，这就是您收到错误的原因:因此您必须使用这样的可编码:

首先:你必须像这样创建可编码类型结构(你的可编码结构变量名称应该与你得到的响应相同):

struct Audiobook: Codable {
    let id: Int?
    let descricao: String?
    let urlImagem: String?

}

第二:当你得到响应时，然后直接使用 codale 进行解析，如下所示:

guard let unwrappedDAta = data else { print("Error unwrapping data"); return }

do {

    let posts = try JSONDecoder().decode([Audiobook].self, from: unwrappedDAta)

    print(posts)
    completion(posts)

} catch let message {
    print("JSON serialization error:" + "\(message)")
}

您可以直接使用响应，例如:

for audio in posts {
  print("audio.id")
  print("audio.descricao")
  print("audio.urlImagem")
}