用Swift展開雅虎API

我正在嘗試以JSON格式從Yahoo finance API獲取Price和Change數據。 Apple Stock API 用Swift展開雅虎API

但是，在解包數據時有一些問題。該程序在執行for jsonObjectString in resultArray!時顯示問題。我懷疑它發現沒有數據，因爲調試過程中的錯誤是fatal error: unexpectedly found nil while unwrapping an Optional value

func GetPrice(){ 
    let session = NSURLSession.sharedSession() 
    let request = NSMutableURLRequest(URL: NSURL(string: "https://query.yahooapis.com/v1/public/yql?q=select%20price%2C%20change%20from%20csv%20where%20url%3D'http%3A%2F%2Fdownload.finance.yahoo.com%2Fd%2Fquotes.csv%3Fs%3DA17U.SI%26f%3Dsl1d1t1c1ohgv%26e%3D.csv'%20and%20columns%3D'symbol%2Cprice%2Cdate%2Ctime%2Cchange%2Ccol1%2Chigh%2Clow%2Ccol2'&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys")!) 
    request.HTTPMethod = "GET" 

    let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in 

     if let error = error { 
      print(error) 
     } 
     if let data = data{ 
      do{ 
       let resultJSON = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions()) 
       let resultArray = resultJSON as? NSArray 
       for jsonObjectString in resultArray!{ 
        let price = jsonObjectString["price"] as! String 
        let change = jsonObjectString["change"] as! String 
        self.priceList.append(PriceTable(stockCode: self.blueChipList[self.index].stockName, price: price, change: change)) 
       } 
       dispatch_async(dispatch_get_main_queue(), {self.tableView.reloadData()}) 

      }catch _{ 
       print("Received not-well-formatted JSON") 
      } 

     } 
     if let response = response { 
      let httpResponse = response as! NSHTTPURLResponse 
      print("response code = \(httpResponse.statusCode)") 
     } 
    }) 
    task.resume() 
}

來源

2015-11-26 Joe Leong

resultJSON是詞典，這是當你將它轉換爲NSArray爲什麼它返回零。

如果你想得到價格和變化的價值，請嘗試這個。

let resultDict = resultJSON as? NSDictionary 
let queryDict = resultDict["query"] 
let resultsDict = queryDict["results"] 
let rowDict = resultsDict["row"] 
let price = rowDict["price"] as! String 
let change = rowDict["change"] as! String

來源

2015-11-26 03:35:23

用Swift展開雅虎API

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