投资模型
public struct PortfolioModel : Decodable {
let symbols_requested: Int
let symbols_returned: Int
let data: [Portfolio]
}
struct Portfolio : Decodable {
let stockValue : StockValue
let todaysLowHigh : HighLowValue
let fiftyTwoWeekLowHigh : HighLowValue
let priceBandLowHigh : HighLowValue
let stockPriceValue : StockPriceValue
let stockStatistics : StockStatistics
struct StockValue: Decodable {
let stockName: String?
let stockCurrentPrice: String?
let stockChangeValue : String?
let stockVolume : String?
let stockDateValue : String?
}
struct HighLowValue: Decodable {
let minimumValue : String?
let maximumValue : String?
let currentValue : String?
}
struct StockPriceValue: Decodable {
let bidPriceValue : String?
let bidQtyValue : String?
let offerPriceValue : String?
let offerOtyValue : String?
let openPriceValue : String?
}
struct StockStatistics : Decodable{
let stockMarketCapValue : String?
let stockDividendValue : String?
let stockDivYield : String?
let stockfaceValue :String?
let stockMarketLot : String?
let stockIndustryPE : String?
let stockEPSTTM : StandColidate
let stockPC : StandColidate
let stockPE : StandColidate
let stockPriceBook : StandColidate
let stockBookValue : StandColidate
let stockDeliverables : String?
}
struct StandColidate : Decodable{
let standalone : String?
let consolidate: String?
}
}
Web客户端服务器
.responseJSON { response in
switch response.result {
case .success:
let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .iso8601
do {
let result = try decoder.decode(PortfolioModel.self, from: response.data!)
self.portfolio = result.data
print(result.data)
completion(self.portfolio)
return
}
catch {
MKProgress.hide()
print("Decoding error:", error)
}
case .failure(let error):
MKProgress.hide()
print("Request failed with error: \(error)")
}
服务器响应
{
"symbols_requested": 1,
"symbols_returned": 1,
"data": [
{
"symbol": "AAPL",
"name": "Apple Inc.",
"currency": "USD",
"price": "196.85",
"price_open": "196.45",
"day_high": "197.10",
"day_low": "195.93",
"52_week_high": "233.47",
"52_week_low": "142.00",
"day_change": "1.16",
"change_pct": "0.59",
"close_yesterday": "195.69",
"market_cap": "926316741610",
"volume": "8909408",
"volume_avg": "28596757",
"shares": "4715280000",
"stock_exchange_long": "NASDAQ Stock Exchange",
"stock_exchange_short": "NASDAQ",
"timezone": "EDT",
"timezone_name": "America/New_York",
"gmt_offset": "-14400",
"last_trade_time": "2019-04-05 12:28:19"
}
]
}
我收到了catch block错误消息
解码错误：keyNotFound（CodingKeys（stringValue：“stockValue”，intValue：nil），Swift.DecodingError.Context（codingPath：[CodingKeys（stringValue：“data”，intValue：nil），_ JSONKey（stringValue：“Index 0”，intValue ：0）]，debugDescription：“没有与键CodingKeys相关的值（stringValue：\”stockValue \“，intValue：nil）（\”stockValue \“）。”，underlyingError：nil））
我知道它错误的解码方式！将所有String值都转换为单个struct Portfolio但是我可以使用以下ProtfolioModel实现它吗？
错误很明显：关键stockValue数组中没有关键的data。无论如何，没有字典表示该数组中的结构。
这两个结构匹配JSON，在quicktype.io上快速创建
public struct PortfolioModel : Decodable {
let symbolsRequested: Int
let symbolsReturned: Int
let data: [Portfolio]
enum CodingKeys: String, CodingKey {
case symbolsRequested = "symbols_requested"
case symbolsReturned = "symbols_returned"
case data = "data"
}
}
struct Portfolio: Codable {
let symbol, name, currency, price, priceOpen, dayHigh, dayLow: String
let the52_WeekHigh, the52_WeekLow, dayChange, changePct, closeYesterday, marketCap: String
let volume, volumeAvg, shares, stockExchangeLong, stockExchangeShort, timezone: String
let timezoneName, gmtOffset, lastTradeTime: String
enum CodingKeys: String, CodingKey {
case symbol = "symbol", name = "name", currency = "currency"
case price = "price", priceOpen = "price_open", dayHigh = "day_high"
case dayLow = "day_low", the52_WeekHigh = "52_week_high", the52_WeekLow = "52_week_low"
case dayChange = "day_change", changePct = "change_pct", closeYesterday = "close_yesterday"
case marketCap = "market_cap", volume = "volume", volumeAvg = "volume_avg", shares = "shares"
case stockExchangeLong = "stock_exchange_long", stockExchangeShort = "stock_exchange_short"
case timezone = "timezone", timezoneName = "timezone_name", gmtOffset = "gmt_offset", lastTradeTime = "last_trade_time"
}
}
注意：仍然需要验证这一点，但这是我处理JSON的解决方案。
有同样的问题解码JWT。
步骤如下：
let data = response.data(using: .utf8)!
guard let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] else { return }
struct Json {
let data: Array?
init(json: [String: Any]) {
data = json["data"] as? Array ?? []
}
}
let dataArray = Json(json: json)
let symbol = dataArray.data.symbol ?? ""
全部一起：
do {
let data = response.data(using: .utf8)!
guard let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] else { return }
let dataArray = Json(json: json)
let symbol = dataArray.data.symbol ?? ""
} catch {
let message = "Failed to extract token from json object"
// Your error message handle
// logMessage(messageText: message)
return
}