如何在swift中从字典中的json对象访问元素

Question

我从服务器获取一个字符串作为 API 调用响应，它是一个编码令牌。我解码令牌并获取此有效负载。我可以将“数据”或“iat”值作为键值对访问，但如何循环抛出并访问“数据”键内的元素？请帮忙。

["iat": 1594655088, "data": 
[{"questionCode":"7a75bf82baea11eabffcfa5fb99b9064","question":"In which country you need to 
visit to explore Petra? ","image":"https://tbbd-flight.s3.ap-southeast- 
1.amazonaws.com/quiz/UihDZXwomcu-d2viNsL7UiewQYiqqpXJ.png","options": 
[{"answerCode":"7a766accbaea11ea8317fa5fb99b9064","answer":"Malaysia "}, 
{"answerCode":"7a766b94baea11eaaf95fa5fb99b9064","answer":"Jordan "}, 
{"answerCode":"7a766c02baea11ea8b10fa5fb99b9064","answer":"Vietnam "}, 
{"answerCode":"7a766c66baea11eaa920fa5fb99b9064","answer":"Australia "}]},

{"questionCode":"8b02bff8baea11ea9882fa5fb99b9064","question":"Worlds one of the most 
luxarious hotel \"Burj Al Arab\"  in which country?","image":"https://tbbd-flight.s3.ap- 
southeast-1.amazonaws.com/quiz/QTKKvpJxhWY7DA-G4bhnOdPoQ02WsR4o.png","options": 
[{"answerCode":"8b036cd2baea11eaaa03fa5fb99b9064","answer":"France"}, 
{"answerCode":"8b036d9abaea11ea8085fa5fb99b9064","answer":"Dubai"}, 
{"answerCode":"8b036e12baea11eabafefa5fb99b9064","answer":"England"}, 
{"answerCode":"8b036e80baea11eabf20fa5fb99b9064","answer":"Canada"}]}
]]

Answer 1

使用 Codable 使用以下模型解码上述 JSON data，

struct Response: Codable {
    let iat: Int
    let data: [Question]
}

struct Question: Codable {
    let questionCode, question: String
    let image: String
    let options: [Option]
}

像这样解析 JSON data，

do {
    let response = try JSONDecoder().decode(Response.self, from: data)
    let questions = response.data
    questions.forEach {
        print($0.questionCode)
        //use more fields here...
    }
} catch {
    print(error)
}