Swift JSON 可编码类型不匹配反之亦然

Question

我在解析可编码结构中的 JSON 时遇到问题。

我将发布 2 次不同的尝试，每次尝试都具有相反的行为。

尝试1：

var url = URL(string: "https://api.imgflip.com/get_memes")
let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
    guard let data = data else {
        print("Is NIL")
        return
    }
    let decoder = JSONDecoder()
    decoder.keyDecodingStrategy = .convertFromSnakeCase
    let memeData = try! decoder.decode([Int: Generals].self, from: data)
    print(memeData)
}

task.resume()


struct Generals: Codable {
    let success: String
    let data: [Int: Memes]
}

struct Memes: Codable {
    let memes: [MemeDetail]
}

struct MemeDetail: Codable {

    let id: Int
    let name: String
    let url: URL
    let width: Int
    let height: Int
    let box_count: Int
}

这个给了我以下错误信息：

致命错误：“试试！”表达式意外引发错误：Swift.DecodingError.typeMismatch(Swift.Int, Swift.DecodingError.Context(codingPath: [_DictionaryCodingKey(stringValue: "data", intValue: nil)], debugDescription: "Expected Int key but found String key 相反."，underlyingError: nil))：文件networking.playground，第15行

Type Missmatch Expected Int 但找到 String。

如果我将解码器字典更改为字符串：

let memeData = try! decoder.decode([String: Generals].self, from: data)

我收到相反的错误消息：

[_JSONKey(stringValue: "success", intValue: nil)], debugDescription: "期望解码 Dictionary 但找到了一个数字。",底层错误: nil)): 文件networking.playground，第11行

谁能给我一个建议，我做错了什么或者我错过了什么？

在 JSON 响应之后：

{
    "success": true,
    "data": {
        "memes": [
            {
                "id": "112126428",
                "name": "Distracted Boyfriend",
                "url": "https://i.imgflip.com/1ur9b0.jpg",
                "width": 1200,
                "height": 800,
                "box_count": 3
            },
            {
                "id": "181913649",
                "name": "Drake Hotline Bling",
                "url": "https://i.imgflip.com/30b1gx.jpg",
                "width": 1200,
                "height": 1200,
                "box_count": 2
            },

提前致谢！

Answer 1

始终根据您的 API 响应创建可编码模型。在您的场景中，我认为您的模型将是这样的：

struct Generals: Codable {
    let success: Bool
    let data: Memes
}

struct Memes: Codable {
    let memes: [MemeDetail]
}

struct MemeDetail: Codable {

    let id: String?
    let name: String?
    let url: String?
    let width: Int?
    let height: Int?
    let box_count: Int?
}

在从数据中解码时，像这样解码。

let memeData = try! decoder.decode(Generals.self, from: data)