Question

我目前正在尝试解析从IEX api返回的JSON。我遇到的问题是响应是动态的，取决于您请求的股票名称，JSON响应中的键会更改。因此，当请求AAPL股票信息时，返回的JSON是：

{"AAPL":{"quote":{"symbol":"AAPL","companyName":"Apple Inc.","primaryExchange":"Nasdaq Global Select","sector":"Technology","calculationPrice":"close","open":158.53,"openTime":1546266600303,"close":157.74,"closeTime":1546290000568,"high":159.36,"low":156.48,"latestPrice":157.74,"latestSource":"Close"}}

在一次请求中请求多只股票将返回JSON，可在此处查看：https://api.iextrading.com/1.0/stock/market/batch?symbols=AAPL,GOOGL,AAPL&types=quote,chart&range=1m

我正在使用的可解码结构如下：

struct Symbol: Decodable {
let quote: Quote
let chart: [Chart]
}

struct Chart: Decodable {
let date: String
let open, high, low, close: Double
let volume, unadjustedVolume: Int
let change, changePercent, vwap: Double
let label: String
let changeOverTime: Double

}

struct Quote: Decodable {
let symbol, companyName, primaryExchange, sector: String
let calculationPrice: String
let open: Double
let openTime: Int
let close: Double
let closeTime: Int
let high, low, latestPrice: Double
let latestSource, latestTime: String
let latestUpdate, latestVolume: Int
let delayedPrice: Double
let delayedPriceTime: Int
let extendedPrice, extendedChange, extendedChangePercent: Double
let extendedPriceTime: Int
let previousClose, change, changePercent: Double
let avgTotalVolume: Int
let marketCap: Int
let peRatio, week52High, week52Low, ytdChange: Double

}

使用

let parsedData = try JSONDecoder().decode([String:Symbol].self, from: data!)

有效，但是当尝试仅访问Symbol对象时，我仅获得nil值，所以我不知道发生了什么。我正在寻找像C＃中的JSON.net这样的解决方案，使您能够做到

let parsedData = try JSONDecoder().decode(dictionary<String,Symbol>, from: data!)

当JSON响应中的键是动态的时，如何解码JSON以构造结构？

0 个答案: