快速解码字符串JSON失败

时间:2019-01-05 11:48:06

标签: ios json swift codable jsondecoder

struct APOD: Codable {
    let points: String
    let full_name: String
    let description: String
}

let decoder = JSONDecoder()
let product = try! decoder.decode(APOD.self, from: jsonData.data(using: .utf8)!)

print(product.full_name)

我有一个名为jsonData的字符串,它来自:https://www.instagram.com/georgeanisimow/?__a=1。我格式化了文件并将其粘贴到项目中只是为了使工作正常。

不幸的是,它失败并显示以下错误代码:

  

“线程1:致命错误:“尝试!”表情意外地引起了   错误:Swift.DecodingError.keyNotFound(CodingKeys(stringValue:   “ points”,intValue:无),Swift.DecodingError.Context(codingPath:[],   debugDescription:“没有与键关联的值   CodingKeys(stringValue:\“ points \”,intValue:nil)(\“ points \”)。“,   底层错误:nil))“

我正在尝试在JSON中打印“ full_name”的值。

这是JSON的开头:

let jsonData ="""    
{  
   "logging_page_id":"profilePage_592027119",
   "show_suggested_profiles":false,
   "graphql":{  
      "user":{  
         "biography":"- Represented by AEFH Talent and CESD Modeling - I travel a lot -",
         "blocked_by_viewer":false,
         "country_block":false,
         "external_url":null,
         "external_url_linkshimmed":null,
         "edge_followed_by":{  
            "count":4571
         },
         "followed_by_viewer":true,
         "edge_follow":{  
            "count":741
         },
         "follows_viewer":true,
         "full_name":"George Anisimow"
      }
   }
}"""

2 个答案:

答案 0 :(得分:0)

有很多方法可以做到这一点

第一种方法:

do {
    let responseData = Data(data.utf8)
    let decodeData = try JSONDecoder().decode(Controller.self, from: responseData)

    if (decodeData.ErrorCode! == "0") {
        //Success
    } else {
        //Failure
    }
} catch let jsonErr {
    //Failure
}

第二种方法:

do {
    if let responseData = response.data, let decodedData = try JSONSerialization.jsonObject(with: responseData, options: []) as? [[String: Any]] {
     print(decodedData)
    }
} catch let error as NSError {
    print(error)
}

答案 1 :(得分:0)

使用这些结构会得到full_name(我只指定了相关的键)

struct Root: Decodable {
    let graphql : Graphql
}

struct Graphql: Decodable {
    let user : User
}

struct User: Decodable {
    let fullName : String
}

并解码数据

let data = Data(jsonData.utf8)
do {
    let decoder = JSONDecoder()
    decoder.keyDecodingStrategy = .convertFromSnakeCase
    let result = try decoder.decode(Root.self, from: data)
    let fullname = result.graphql.user.fullName
    print(fullname)

} catch { print(error) }
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