python - 无法像 Python 枚举那样读取 Swift 中返回的 JSON 数组

Question

我正在尝试从https://github.com/joshfraser/robinhood-to-csv复制以下Python代码行来自 GitHub 的存储库，以便读取我的交易历史记录。

orders = robinhood.get_endpoint('orders')
paginated = True
page = 0
while paginated:
    for i, order in enumerate(orders['results']):
        executions = order['executions']
        instrument = robinhood.get_custom_endpoint(order['instrument'])
        fields[i + (page * 100)]['symbol'] = instrument['symbol']
        for key, value in enumerate(order):
            if value != "executions":
                fields[i + (page * 100)][value] = order[value]
        if order['state'] == "filled":
            trade_count += 1
            for key, value in enumerate(executions[0]):
                fields[i + (page * 100)][value] = executions[0][value]
        elif order['state'] == "queued":
            queued_count += 1
    # paginate
    if orders['next'] is not None:
        page = page + 1
        orders = robinhood.get_custom_endpoint(str(orders['next']))
    else:
        paginated = False

我们也有

def get_endpoint(self, endpoint=None):
        res = self.session.get(self.endpoints[endpoint])
        return json.loads(res.content.decode('utf-8'))

因此，我一直在编写以下 iOS 代码。我在 XCode Playground 中使用此代码，因此请随意编写一个代码来遵循

import UIKit
import PlaygroundSupport

let LoginEndpoint:String = "https://api.robinhood.com/api-token-auth/"
let LoginRequestData:[String : String] = ["username": "EmailAdress", "password": "Password"]
let OrdersEndpoint:String = "https://api.robinhood.com/orders/"


func httpReq(type: String, url: String, body:[String : String], header:[String : String]) -> ([String : Any]?, Data?, String?){
    let url = URL(string: url)
    var returnData:([String : Any]?, Data?, String?)? = nil
    if let url = url {
        var request = NSMutableURLRequest(url: url) as URLRequest
        request.httpMethod = type
        var postString = ""
        for (key, value) in body {
            if (postString != "") {
                postString += "&"
            }
            postString += "\(key)=\(value)"
        }
        request.httpBody = postString.data(using: .utf8)

        for (key, value) in header {
            request.addValue(value, forHTTPHeaderField: key)
        }

        let _ = URLSession.shared.dataTask(with: request, completionHandler: {(data, response, error) in
            if let data = data {
                do {

                    let jsonSerialized = try JSONSerialization.jsonObject(with: data, options: []) as? [String : Any]
                    returnData = (jsonSerialized, data, nil)
                } catch (_) {
                    returnData = (nil, data, "JSON Parse Erro")
                }
            } else if let error = error {
                returnData = (nil, nil, error.localizedDescription)
            }
        }).resume()
    }

    while (returnData == nil) {}

    return returnData!
}

let tokenQuery = httpReq(type: "POST", url: LoginEndpoint, body: LoginRequestData, header: [:])
if let token = tokenQuery.0?["token"] {
    print("token \(token)")
    let historyQuery = httpReq(type: "GET", url: OrdersEndpoint, body: [:], header: ["Authorization": "Token \(token)"])
    if let results = historyQuery.0?["results"], let countString = historyQuery.0?["count"] {
    }
}
RunLoop.main.run()
PlaygroundPage.current.needsIndefiniteExecution = true

正如您所看到的，我正在使用身份验证 token 来访问订单端点。我确实从订单端点得到了很好的响应，但我不知道如何解释它。

从Python代码看来，它返回一个JSON对象数组，但是我不知道如何快速访问该数组。我什至不确定我是否正确解码了它。有趣的是，当您查看 Playgrounds 中返回的对象时，XCode 似乎知道存在一个数组。我怎样才能到达它？

Answer 1

由于缺乏凭据，无法真正了解您的服务返回的信息。

但是，请查看SwiftyJSON 。它是一个非常好的库，对于在 Swift 中处理 JSON 数据非常有帮助。它应该可以解决您的 JSON 处理问题。