title: Waiting to fill in a tableview when you data is downloaded from a url
body: <p>I am trying to get a table filled when after I downloaded information from a url.This data will fill in different labels and a image view in the table view which is nested in a view controller. I got the data from a local json file to parse out right and also fill in the labels with the right values. The problem is the table methods that fill the table get called before I can download the data from the url. Any help with this will be appreciated. 
  thanks</p>
  
  <p>Here is what I have so far:</p>
  
  <pre><code>var titleArray = [String]()
  var descriptionArray = [String]()
  var amountArray = [Int]()
  var typeArray = [String]()
  var startDateArray = [String]()
  var endDateArray = [String]()
  var barcodeArray = [String]()
  
  
  @IBOutlet weak var myTableView: UITableView!
  // MARK: - UIViewController lifecycle
  
  override func viewDidLoad() {
      super.viewDidLoad()
      myTableView.dataSource = self
      myTableView.delegate = self
      downloadCouponData(couponUrl)
  
  
  }
  
  // MARK: - UITableViewDataSource
  
  func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -&gt; Int {
  
      print("Running Table view that counts the number of rows")
      return titleArray.count
  }
  
   func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -&gt; UITableViewCell {
      let cell = tableView.dequeueReusableCellWithIdentifier("Coupon", forIndexPath: indexPath) as! CouponTableViewCell
  
      print("Running TableView that fills the table")
  
      var amountText : String
      amountText = String( amountArray[indexPath.row])
  
      var typeType : String = ""
  
      if(typeArray[indexPath.row] == "PERCENT_OFF")
      {
          typeType = "%"
      }else
      {
          typeType = "¥ off"
      }
  
      cell.couponTitle.text = titleArray[indexPath.row]
      cell.couponDescription.text = descriptionArray[indexPath.row]
      cell.couponAmount.text = amountText + typeType
      cell.couponStartDate.text = startDateArray[indexPath.row]
      cell.couponEndDate.text = endDateArray[indexPath.row]
      cell.couponBarcodeNumber.text = barcodeArray[indexPath.row]
      let img = Barcode.fromString(barcodeArray[indexPath.row])
      cell.couponBarcode.image = img
  
  
      return cell
  }
  
  class Barcode {
      class func fromString(string : String) -&gt; UIImage? {
          let data = string.dataUsingEncoding(NSASCIIStringEncoding)
          let filter = CIFilter(name: "CICode128BarcodeGenerator")
          filter!.setValue(data, forKey: "inputMessage")
          return UIImage(CIImage: filter!.outputImage!)
      }
  }
  
  //Function to log into the server and retrive data
  func  downloadCouponData(myUrl : String)
  {
      print("Downloading Coupon Data")
      Alamofire.request(.GET, myUrl)
          .authenticate(user: "admin", password: "admin")
          .validate()
          .responseString { response in
              print("Success: \(response.result.isSuccess)")
              self.parseCoupons(response.result.value!)
  
      }
  }
  
  func parseCoupons(response : String)
  {
      print("Starting to parse the file")
      let data = response.dataUsingEncoding(NSUTF8StringEncoding)
      var myJson : NSArray
      myJson = []
  
      do {
          myJson = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as! NSArray
          print("MyJson lenght" , myJson.count)
      }
      catch {
          print("Error")
      }
  
  
      for i in 0..&lt;myJson.count
      {
          titleArray.append((myJson[i]as! NSDictionary)["name"] as! String)
          descriptionArray.append((myJson[i]as! NSDictionary)["description"] as! String)
          amountArray.append((myJson[i]as! NSDictionary)["amount"] as! Int)
          typeArray.append((myJson[i]as! NSDictionary)["type"] as! String)
          startDateArray.append((myJson[i]as! NSDictionary)["start_date"] as! String)
          endDateArray.append((myJson[i]as! NSDictionary)["end_date"] as! String)
          barcodeArray.append((myJson[i]as! NSDictionary)["barcode"] as! String)
      }
  
      for gus in descriptionArray{
          print("descr array: " + gus)
      }
      for gus in amountArray{
          print("Amount array: " , gus)
      }
      for gus in typeArray{
          print("Type array: " + gus)
      }
      for gus in startDateArray{
          print("Start array: " + gus)
      }
      for gus in endDateArray{
          print("End array: " + gus)
      }
      for gus in barcodeArray{
          print("Bar array: " + gus)
      }
  
      for gus in titleArray{
          print("Title array: " + gus)
      }
  
  }
  </code></pre>
  
  <p>}</p>