JSON 解码未填充表视图

Question

我正在尝试从网站 movieDatabase.com 解析数据但是将数据解码为 json 并填充我的表视图时出现了一些问题。我不确定为什么会这样。 请帮助我找出问题所在。 这是我的代码。 https://github.com/lexypaul13/Movie-Browser/tree/main/Movie-Browser

struct Movies: Codable {
    let overview:String?
    let original_title: String?
    let poster_path:String
}


struct ApiResponse:Codable, Hashable {
    let page:Int
    let shows:[Movies]

    enum CodingKeys:String, CodingKey {
        case page = "page"
        case shows = "results"
    }
}



class NetworkManger{

    enum EndPoint{
        case showList
    }

    static let shared = NetworkManger()
    private let baseURL : String
    private var  apiKeyPathCompononent :String

    private init(){
        self.baseURL = "https://api.themoviedb.org/3/movie/now_playing?"
        self.apiKeyPathCompononent =  "api_key=a07e22bc18f5cb106bfe4cc1f83ad8ed"
    }
    private var jsonDecoder:JSONDecoder = {
        let decoder = JSONDecoder()
        decoder.keyDecodingStrategy = .convertFromSnakeCase
        return decoder
    }()



    func get<T:Decodable>(_ endPoints: EndPoint, urlString: String,  completed:@escaping(Result<T?,ErroMessage>)->Void){
        guard let url = urlBuilder(endPoint: endPoints) else {
            completed(.failure(.invalidURL))
            return
        }

        let task = URLSession.shared.dataTask(with: url){ data, response, error in
            if let _ = error {
                completed(.failure(.unableToComplete))
                return
            }

            guard let response = response as? HTTPURLResponse, response.statusCode==200 else {
                print(ErroMessage.invalidResponse.rawValue)
                completed(.failure(.invalidResponse))
                return
            }

            guard let data = data else{
                completed(.failure(.invalidData))
                return
            }
            do{
                let apiResponse = try self.jsonDecoder.decode([T].self, from: data)
                DispatchQueue.main.async {
                    completed(.success(apiResponse as? T))
                }

            } catch{
                print(ErroMessage.invalidData.rawValue)
            }
        }
        task.resume()
    }
    private func urlBuilder(endPoint:EndPoint )->URL?{
        switch endPoint {
        case .showList:
            return URL(string: baseURL + apiKeyPathCompononent )
        }
    }

    func getMovies(){
        NetworkManger.shared.get(.showList, urlString: "") { [weak self] (result: Result<[Movies]?,ErroMessage> ) in
            guard let self = self else { return }
            switch result{
            case .success(let movies):
                self.movies = movies ?? []
                DispatchQueue.main.async {self.tableView.reloadData()}

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

        }
    }
}

Answer 1

从 api 返回的根 object 是您的ApiResult结构。 这包含一个电影数组（您已将其映射到ApiResult的shows属性）

您需要更改getMovies function 以便可以推断出正确的泛型类型并且 json 解码器可以做正确的事情

func getMovies(){
        NetworkManger.shared.get(.showList, urlString: "") { [weak self] (result: Result<ApiResult,ErroMessage> ) in
            guard let self = self else { return }
            switch result{
            case .success(let apiResult):
                self.movies = apiResult.shows
                DispatchQueue.main.async {self.tableView.reloadData()}

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

        }
    }