완료 문 변수에서 데이터를 검색 할 때 공백이 반환됩니다.

Question

저는 iOS 프로그래밍이 처음인데 완성 문에서 변수를 사용할 때 문제가 있습니다. 아래 코드를 포함 시켰습니다. 데이터 유형 배열에 완료 변수를 저장할 때 빈 문자열 만 반환하는 것 같습니다.

참고 : 완료 데이터는 loadSampleStockData 함수를 호출하고 나중에 FUNC에있는 tableView 세포 (있는 tableView : jQuery과, cellForRowAtIndexPath indexPath : NSIndexPath)에 반환 할 생각입니다 - 어떤 도움>있는 UITableViewCell

덕분에 그 수 제공된! 당신의 비동기 호출은 아무것도 stock1...3를 설정하기 전에

import UIKit 

class dashboardViewController: DefaultViewController, UITableViewDataSource, UITableViewDelegate { 

    @IBOutlet weak var tableView: UITableView! 
    @IBOutlet weak var balanceLabel: UILabel! 

    var stocks = [stockData]() 
    let stock = stockinfo() 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     tableView.delegate = self 
     tableView.dataSource = self 
     tableView.reloadData() 
     loadSampleStockData() 
     user.newUser() // Move to login function when login and registration is implemented 

     //Sets the Balance Label on Dashboard 
     balanceLabel.text = "$" + String(format: "%.2f", user.getBalance()) 
    } 

    func loadSampleStockData() { 

     var stock1: stockData = stockData(name: "", askPrice: "", percentageChange: "", stockTicker: "") 
     var stock2: stockData = stockData(name: "", askPrice: "", percentageChange: "", stockTicker: "") 
     var stock3: stockData = stockData(name: "", askPrice: "", percentageChange: "", stockTicker: "") 

     stock.getInfo("FB") {(name, price, change) in dispatch_async(dispatch_get_main_queue(),{ 
      stock1 = stockData(name: name, askPrice: price, percentageChange: change, stockTicker: "FB") 
      stocks.append(stock1) 
     }) 
     } 

     stock.getInfo("MSFT") {(name, price, change) in dispatch_async(dispatch_get_main_queue(),{ 
      stock2 = stockData(name: name, askPrice: price, percentageChange: change, stockTicker: "MSFT") 
      stocks.append(stock2) 
     }) 
     } 

     stock.getInfo("APPL") {(name, price, change) in dispatch_async(dispatch_get_main_queue(),{ 
      stock3 = stockData(name: name, askPrice: price, percentageChange: change, stockTicker: "APPL") 
      stocks.append(stock3) 
     }) 
     } 
     print(stocks.count) 
    } 

    func numberOfSectionsInTableView(tableView: UITableView) -> Int { 
     return 1 
    } 

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return stocks.count 
    } 

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 

     let cellIdentifier = "stockViewCell" 

     let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! stockTableViewCell 

     let stock = stocks[indexPath.row] 

     cell.stockName.text = stock.name 
     cell.stockPercentage.text = stock.percentageChange 
     cell.stockDollarChange.text = stock.askPrice 
     cell.stockTicker.text = stock.stockTicker 

     return cell 
    } 
} 

Answer 1

stocks += [stock1, stock2, stock3] 때문에 발생합니다.

stocks의 작성은 완료 핸들러에서 수행해야합니다.