我正在尝试将一些来自JSON Yahoo api的数据放入一些UILabel中。 当我尝试运行我的项目时，我遇到了一个线程1错误。
以下是我的一些代码：
@IBOutlet weak var tableView: UITableView!
var stockSymbol: String = "AAPL"
var stock: [Stock] = []
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
tableView.delegate = self
tableView.registerNib(UINib(nibName: "HomeCell", bundle: NSBundle.mainBundle()), forCellReuseIdentifier: "homeCell")
tableView.rowHeight = 60
// Do any additional setup after loading the view.
SwiftStockKit.fetchStockForSymbol(symbol: stockSymbol) { (stock) -> () in
self.stock = [stock]
self.tableView.reloadData()
}
}
class func fetchStockForSymbol(symbol symbol: String, completion:(stock: Stock) -> ()) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
let stockURL = "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quotes%20where%20symbol%20in%20(%22AAPL%22)&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&format=json"
Alamofire.request(.GET, stockURL).responseJSON { response in
if let resultJSON = response.result.value as? [String : AnyObject] {
if let stockData = ((resultJSON["query"] as! [String : AnyObject])["results"] as! [String : AnyObject])["quote"] as? [String : AnyObject] {
// lengthy creation, yeah
var dataFields = [[String : String]]()
dataFields.append(["Ask" : stockData["Ask"] as? String ?? "N/A"])
dataFields.append(["Average Daily Volume" : stockData["AverageDailyVolume"] as? String ?? "N/A"])
dataFields.append(["Bid" : stockData["Bid"] as? String ?? "N/A"])
dataFields.append(["Book Value" : stockData["BookValue"] as? String ?? "N/A"])
dataFields.append(["Change" : stockData["Change"] as? String ?? "N/A"])
dataFields.append(["Percent Change" : stockData["ChangeinPercent"] as? String ?? "N/A"])
dataFields.append(["Day High" : stockData["DaysHigh"] as? String ?? "N/A"])
dataFields.append(["Day Low" : stockData["DaysLow"] as? String ?? "N/A"])
dataFields.append(["Div/Share" : stockData["DividendShare"] as? String ?? "N/A"])
dataFields.append(["Div Yield" : stockData["DividendYield"] as? String ?? "N/A"])
dataFields.append(["EBITDA" : stockData["EBITDA"] as? String ?? "N/A"])
dataFields.append(["Current Yr EPS Estimate" : stockData["EPSEstimateCurrentYear"] as? String ?? "N/A"])
dataFields.append(["Next Qtr EPS Estimate" : stockData["EPSEstimateNextQuarter"] as? String ?? "N/A"])
dataFields.append(["Next Yr EPS Estimate" : stockData["EPSEstimateNextYear"] as? String ?? "N/A"])
dataFields.append(["Earnings/Share" : stockData["EarningsShare"] as? String ?? "N/A"])
dataFields.append(["50D MA" : stockData["FiftydayMovingAverage"] as? String ?? "N/A"])
dataFields.append(["Last Trade Date" : stockData["LastTradeDate"] as? String ?? "N/A"])
dataFields.append(["Last" : stockData["LastTradePriceOnly"] as? String ?? "N/A"])
dataFields.append(["Last Trade Time" : stockData["LastTradeTime"] as? String ?? "N/A"])
dataFields.append(["Market Cap" : stockData["MarketCapitalization"] as? String ?? "N/A"])
dataFields.append(["Company" : stockData["Name"] as? String ?? "N/A"])
dataFields.append(["One Yr Target" : stockData["OneyrTargetPrice"] as? String ?? "N/A"])
dataFields.append(["Open" : stockData["Open"] as? String ?? "N/A"])
dataFields.append(["PEG Ratio" : stockData["PEGRatio"] as? String ?? "N/A"])
dataFields.append(["PE Ratio" : stockData["PERatio"] as? String ?? "N/A"])
dataFields.append(["Previous Close" : stockData["PreviousClose"] as? String ?? "N/A"])
dataFields.append(["Price-Book" : stockData["PriceBook"] as? String ?? "N/A"])
dataFields.append(["Price-Sales" : stockData["PriceSales"] as? String ?? "N/A"])
dataFields.append(["Short Ratio" : stockData["ShortRatio"] as? String ?? "N/A"])
dataFields.append(["Stock Exchange" : stockData["StockExchange"] as? String ?? "N/A"])
dataFields.append(["Symbol" : stockData["Symbol"] as? String ?? "N/A"])
dataFields.append(["200D MA" : stockData["TwoHundreddayMovingAverage"] as? String ?? "N/A"])
dataFields.append(["Volume" : stockData["Volume"] as? String ?? "N/A"])
dataFields.append(["52w High" : stockData["YearHigh"] as? String ?? "N/A"])
dataFields.append(["52w Low" : stockData["YearLow"] as? String ?? "N/A"])
let stock = Stock(
ask: dataFields[0].values.first,
averageDailyVolume: dataFields[1].values.first,
bid: dataFields[2].values.first,
bookValue: dataFields[3].values.first,
changeNumeric: dataFields[4].values.first,
changePercent: dataFields[5].values.first,
dayHigh: dataFields[6].values.first,
dayLow: dataFields[7].values.first,
dividendShare: dataFields[8].values.first,
dividendYield: dataFields[9].values.first,
ebitda: dataFields[10].values.first,
epsEstimateCurrentYear: dataFields[11].values.first,
epsEstimateNextQtr: dataFields[12].values.first,
epsEstimateNextYr: dataFields[13].values.first,
eps: dataFields[14].values.first,
fiftydayMovingAverage: dataFields[15].values.first,
lastTradeDate: dataFields[16].values.first,
last: dataFields[17].values.first,
lastTradeTime: dataFields[18].values.first,
marketCap: dataFields[19].values.first,
companyName: dataFields[20].values.first,
oneYearTarget: dataFields[21].values.first,
open: dataFields[22].values.first,
pegRatio: dataFields[23].values.first,
peRatio: dataFields[24].values.first,
previousClose: dataFields[25].values.first,
priceBook: dataFields[26].values.first,
priceSales: dataFields[27].values.first,
shortRatio: dataFields[28].values.first,
stockExchange: dataFields[29].values.first,
symbol: dataFields[30].values.first,
twoHundreddayMovingAverage: dataFields[31].values.first,
volume: dataFields[32].values.first,
yearHigh: dataFields[33].values.first,
yearLow: dataFields[34].values.first,
dataFields: dataFields
)
dispatch_async(dispatch_get_main_queue()) {
completion(stock: stock)
}
}
}
}
}
}
这是结构：
struct Stock {
var ask: String?
var averageDailyVolume: String?
var bid: String?
var bookValue: String?
var changeNumeric: String?
var changePercent: String?
var dayHigh: String?
var dayLow: String?
var dividendShare: String?
var dividendYield: String?
var ebitda: String?
var epsEstimateCurrentYear: String?
var epsEstimateNextQtr: String?
var epsEstimateNextYr: String?
var eps: String?
var fiftydayMovingAverage: String?
var lastTradeDate: String?
var last: String?
var lastTradeTime: String?
var marketCap: String?
var companyName: String?
var oneYearTarget: String?
var open: String?
var pegRatio: String?
var peRatio: String?
var previousClose: String?
var priceBook: String?
var priceSales: String?
var shortRatio: String?
var stockExchange: String?
var symbol: String?
var twoHundreddayMovingAverage: String?
var volume: String?
var yearHigh: String?
var yearLow: String?
var dataFields: [[String : String]]
}
我也有一个不同的stockurl我的swiftStockKit文件，可能会阻止显示数据到UILabel
let stockURL = "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quotes%20where%20symbol%20in%20(%22AAPL%22)&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&format=json"
其余的都是一样的。
答案 0 :(得分：0)
一些建议：
https所以请使用dispatch_async。默认情况下，请求将在后台线程上执行。ObjectMapper这样的JSON到对象映射框架。您可以使用其本机数据类型而不是字符串来显示字段。tableView:cellForRowAtIndexPath:方法。所以这个答案的其余部分是关注JSON处理您需要稍微重新定义Stock结构（为简洁起见而编辑）：
import Foundation
import ObjectMapper
struct Stock: Mappable {
var symbol: String?
var ask: Double?
var lastTradeDate: NSDate?
// other fields...
var dataFields = [[String : String]]()
init?(_ map: Map) {
// Perform validation of the JSON here
// Leave blank if you don't need to validate anything
}
mutating func mapping(map: Map) {
symbol <- map["query.results.quote.symbol"] // maps to a String
ask <- map["query.results.quote.Ask"] // maps to a Double
// You probably want to combine this with LastTradeTime
// but I'm keeing them as separate for now
lastTradeDate <- (map["query.results.quote.LastTradeDate"], MyDateTransform())
}
}
// We need a custom date formatter since Yahoo doesn't
// return the standard format of yyyy-MM-dd
class MyDateTransform : TransformType {
typealias Object = NSDate
typealias JSON = String
static let dateFormatter = { Void -> NSDateFormatter in
let formatter = NSDateFormatter()
formatter.dateFormat = "M/d/yyyy"
return formatter
}()
func transformFromJSON(value: AnyObject?) -> NSDate? {
if let stringValue = value as? String {
return MyDateTransform.dateFormatter.dateFromString(stringValue)
} else {
return nil
}
}
func transformToJSON(value: NSDate?) -> String? {
if let dateValue = value {
return MyDateTransform.dateFormatter.stringFromDate(dateValue)
} else {
return nil
}
}
}
用法：
let stockURL = "https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quotes%20where%20symbol%20in%20(%22AAPL%22)&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&format=json"
Alamofire.request(.POST, stockURL)
.validate()
.responseJSON { response in
guard response.result.isSuccess else {
print(response.result.error!)
return
}
// This is all it takes to initiate a new object from JSON
let stock = Mapper<Stock>().map(response.result.value)
}