ios - 我如何使用 Codable 来解析这个 JSON？

Question

我一直在尝试从我的 JSON 中解析这个对象并不断收到这个错误:

"Error: typeMismatch(Swift.Array, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Array but found a dictionary instead.", underlyingError: nil))\n"

如果我从这里删除 Array Bracket let video = try decoder.decode([Content].self, from: data) 然后得到一个错误提示:

"Error: keyNotFound(CodingKeys(stringValue: "description", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: \"description\", intValue: nil) (\"description\").", underlyingError: nil))\n"

我怎样才能让它消失？这是我的 JSON 和代码:

    JSON: 

        > {     "content": [{
        >              "description": "Hello",
        >              "category": "World wides",
        >              "creator": {
        >              "name": "The One",
        >              "site": "Purple",
        >              "url": "http://www.sample.com"
        >              },
        >              "time": 300,
        >              "full": "https:sample2.com",
        >              "clothes": "jacket",
        >              }] 
           }


struct Content: Decodable {
    let description: String
    let category: String
}


if let fileURL = Bundle.main.url(forResource: "stub", withExtension: "json") {
    do {
        let data = try Data(contentsOf: fileURL)

        let decoder = JSONDecoder()
        let video = try decoder.decode([Content].self, from: data)

        print(video.description)

        // Success!
       // print(content.category)
    } catch {
        print("Error: \(error)")
    }
} else {
    print("No such file URL.")
}

Answer 1

在您的 JSON 数据中，content 包含单个元素的数组。

我建议您像这样创建结构:

struct Response: Decodable {
  let content: [Item]
}

struct Item: Decodable {
  let description: String
  let category: String
}

然后你可以解码它并像这样使用它:

let response = try decoder.decode(Response.self, from: data)
guard !response.content.isEmpty else { // error handling here }
let video = response.content[0]