Swift：尝试查询时得到 nil api

Question

我无法从 api 获取股票价格。我正在使用 SwiftyJSON 框架来接收数据。当我执行代码时，它在控制台中给我 nil 。我不知何故找不到错误。

import UIKit

class ViewController: UIViewController
{
@IBOutlet weak var inputQuote: UITextField!

@IBAction func buttonTapped(sender: AnyObject)
{
    var stockQuote = inputQuote.text
    getJSON(stockQuote!)
}

override func viewDidLoad()
{
    super.viewDidLoad()
}

func getJSON(quote: String)
{

    let markitOnDemandURL = "http://dev.markitondemand.com/MODApis/Api/v2/Quote/jsonp?symbol=" + quote.uppercaseString + "&callback=myFunction"

    let url = NSURL(string: markitOnDemandURL)
    let request = NSURLRequest(URL: url!)
    let session = NSURLSession(configuration: NSURLSessionConfiguration.defaultSessionConfiguration())
    let task = session.dataTaskWithRequest(request) {(data, response, error) -> Void in

        if error == nil {

            let swiftyJSON = JSON(data: data!)
            let stockPrice = swiftyJSON["LastPrice"].stringValue
            print(stockPrice)
        }

        else
        {
            print("error")
        }
    }
    task.resume()
}

}

这是我正在使用的 api：http://dev.markitondemand.com/MODApis/Api/v2/Quote/jsonp?symbol=AAPL&callback=myFunction

如果你能看看我的代码并帮助我解决这个问题，那就太好了。感谢您的努力。

Answer 1

您目前从这个 api 得到的结果是

myFunction({"Status":"SUCCESS","Name":"Apple Inc","Symbol":"AAPL","LastPrice":116.05,"Change":1.98999999999999,"ChangePercent":1.74469577415395,"Timestamp":"Mon Oct 10 00:00:00 UTC-04:00 2016","MSDate":42653,"MarketCap":625328810150,"Volume":36235956,"ChangeYTD":105.26,"ChangePercentYTD":10.2508075242257,"High":116.75,"Low":114.72,"Open":115.02})

这是一个 无效 JSON

从开头删除 myFunction( 并在末尾删除 ) 将使它成为有效的 json

即

{
  "Status": "SUCCESS",
  "Name": "Apple Inc",
  "Symbol": "AAPL",
  "LastPrice": 116.05,
  "Change": 1.98999999999999,
  "ChangePercent": 1.74469577415395,
  "Timestamp": "Mon Oct 10 00:00:00 UTC-04:00 2016",
  "MSDate": 42653,
  "MarketCap": 625328810150,
  "Volume": 36235956,
  "ChangeYTD": 105.26,
  "ChangePercentYTD": 10.2508075242257,
  "High": 116.75,
  "Low": 114.72,
  "Open": 115.02
}

您可以使用 POSTMAN 等各种工具或 http://jsonviewer.stack.hu/ and http://jsonlint.com/ 等链接来验证您的 JSON。

Swift：尝试查询时得到 nil api

Swift: Getting nil when trying to query api

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swift

swifty-json