Swift中的JSONDecoder无法工作

Question

Swift中的JSONDecoder无法工作

5

我观看了WWDC 102会话并尝试使用JSONDecoder进行建模，但我有一个问题，这是我的结构体：

public struct DataListResult:Codable{
    let _id : String
    let createdAt : String
    let desc : String
    let images : Array<String>
    let publishedAt : String
    let source : String
    let type : String
    let url : String
    let used : Int
    let who : String
}

public struct DataListModel:Codable{

    let results : [DataListResult]
    let error: Bool
}

JSON:

{
  "results" : [
    {
      "_id" : "59266a79421aa92c73b6475c",
      "images" : [
        "http:\/\/img.gank.io\/875a9508-3a1e-4d4b-8b91-c111ea62871a"
      ],
      "source" : "chrome",
      "who" : "S",
      "publishedAt" : "2017-05-25T13:32:48.92Z",
      "used" : true,
      "createdAt" : "2017-05-25T13:24:09.35Z",
      "type" : "iOS",
      "desc" : "iOS ",
      "url" : "https:\/\/github.com\/adamzjk\/iOS-ObjectDetection"
    },
    {
      "_id" : "592502d6421aa92c769a8bac",
      "images" : [
        "http:\/\/img.gank.io\/44e8aa0a-b66f-4a5b-9cb0-74c3ae9fc156"
      ],
      "source" : "chrome",
      "who" : "S",
      "publishedAt" : "2017-05-24T12:09:25.526Z",
      "used" : true,
      "createdAt" : "2017-05-24T11:49:42.14Z",
      "type" : "iOS",
      "desc" : "Whatʼs new in Swift 4",
      "url" : "https:\/\/github.com\/ole\/whats-new-in-swift-4"
    },
    {
      "_id" : "5923a438421aa92c73b64743",
      "images" : [
        "http:\/\/img.gank.io\/25762b53-b2ba-4c1c-9666-1683cd72bb82"
      ],
      "source" : "chrome",
      "who" : "who",
      "publishedAt" : "2017-05-23T11:14:05.141Z",
      "used" : true,
      "createdAt" : "2017-05-23T10:53:44.853Z",
      "type" : "iOS",
      "desc" : "music",
      "url" : "https:\/\/github.com\/HarshilShah\/DeckTransition"
    }
  ],
  "error" : false
}

属性images无法解码，因为我删除了它后可以成功，但我不知道如何修复，请告诉我，谢谢。

 do
            {
                let model = try JSONDecoder().decode(DataListModel.self, from: response.data!)

            }catch let error as NSError {

               print("\(error)") //Error Domain=Swift.DecodingError Code=2 "(null)"


            }

--------- last update 2017.6.17 ----------

let images : Array<String> -> let images : Array<String>?

当图片为空时，它需要有可选属性。谢谢你的帮助。

- Karim

使用您在问题中提供的JSON和结构体，let object = try JSONDecoder().decode(DataListModel.self, from: data) 对我来说运行良好，没有错误。请编辑您的问题以向我们展示您如何解码它以及您遇到的精确错误。 - Rob

1个回答

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原文链接

- vadian · Accepted Answer

属性used应该是Bool类型，但结构已经被正确解码。

do {
    let decoded = try JSONDecoder().decode(DataListModel.self, from: data)
    print(decoded)
} catch {
    print(error)
}

假设 data 是一个 JSON 的 Data 对象。