Swift JSON 编码问题

问题描述

我正在尝试快速解码一些 JSON，但我不断收到错误消息，我假设这是因为我的结构编写不正确。有任何想法吗？我正在调用这个 API https://pokeapi.co/api/v2/pokemon/1/

这里是 json 解码调用：

func fetchPokemonImages() {
        
        for var pokemons in self.Pokemons {
            
            let defaultSession = URLSession(configuration: .default)
            if let url = URL(string: pokemons.url) {
              let request = URLRequest(url: url)
              let dataTask = defaultSession.dataTask(with: request) { (data,response,error) in
                guard let pokemonImage = try? JSONDecoder().decode(PokemonImageList.self,from: data!) else {
                  print(error)
                  return
                }
                dispatchQueue.main.async {
                    
                    self.PokemonsImage.append(contentsOf: pokemonImage.sprites)
                    self.PokemonTableView.reloadData()             }
              }
                dataTask.resume()
            }
        }
    }

这是我的结构：

struct PokemonImage: Codable {
    let back_default: String

    enum CodingKeys: String,CodingKey {
        case backDefault = "back_default"
    }

    init(backDefault: String) {
        self.backDefault = backDefault
    }

    init(from decoder: Decoder) throws {
        let postsContainer = try decoder.container(keyedBy: CodingKeys.self)
        backDefault = try postsContainer.decode(String.self,forKey: .backDefault)
    }
}

struct PokemonImageList: Codable {
    
    let sprites: [PokemonImage]

    enum CodingKeys: String,CodingKey {
        case sprites
    }
}

解决方法

从 API 来看，您的共享 sprites 是一个对象，而不是一个数组

"sprites": {
        "back_default": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/back/1.png","back_female": null,"back_shiny": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/back/shiny/1.png","back_shiny_female": null,"front_default": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/1.png","front_female": null,"front_shiny": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/shiny/1.png","front_shiny_female": null,"other": {
            "dream_world": {
                "front_default": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/other/dream-world/1.svg","front_female": null
            },"official-artwork": {
                "front_default": "https://raw.githubusercontent.com/PokeAPI/sprites/master/sprites/pokemon/other/official-artwork/1.png"
            }
        }

所以 PokemonImageList 中的 sprites 应该是一个对象，而不是一个数组

struct PokemonImageList: Codable {
    
    let sprites: PokemonImage

    enum CodingKeys: String,CodingKey {
        case sprites
    }
}