title: Not able to pass value from one View Controller to another View Controller
body: <p>I am learning Swift and doing one project where I want to <strong>send an array of CLLocationCoordinate2D from one view controller to another View Controller (Map View)</strong> so that I can draw multiple annotation at one time. If my array of CLLocationCoordinate2D has 5 sets of longitudes and latitudes, I want all of them to get passed to my MapViewController and there I want all the annotations to be drawn under in MapView at go without user interactions.</p>
  
  <p><strong>Problem:</strong> In my MapView all I see is empty output in console [] but I am passing a set of longitude and latitude from my initial view controller. How can I keep the values intact? `</p>
  
  <p><strong>Problem:</strong> Once I get all the coordinates in my Map2ViewController then I can simply loop through all the elements to draw the annotations as the map is loading in the MapView right?</p>
  
  <p>Below is what I have tried until now.</p>
  
  <p>My "SearchBloodViewController.swift"   //This is my initial view which generates Longitude and Latitude. </p>
  
  <pre><code>import UIKit
  import MapKit
  
  
  class SearchBloodViewController: UIViewController, UITextFieldDelegate,  CLLocationManagerDelegate 
  {
  var array: [PFObject] = [PFObject]()
  var arra: [CLLocationCoordinate2D] = [CLLocationCoordinate2D]()
  var lat_: Int = 0
  var long_: Int = 0
  @IBOutlet weak var bloodType: UITextField!
  @IBAction func search(sender: UIButton)
  {
      var query = PFQuery(className: "_User")
      query.whereKey("BloodGroup", equalTo: bloodType.text!)
      do
      {
          try array = query.findObjects() as [PFObject]
      }
      catch
      {
  
      }
      for arr in array
      {
          self.lat_ = arr["Latitude"] as! Int
          self.long_ = arr["Longitude"] as! Int
          var cor =  CLLocationCoordinate2D.init(latitude: Double(self.lat_), longitude: Double(self.long_))
          arra.append(cor)
          }
              print(arra)
      // The console Output of this is
    //  [C.CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0), 
  //C.CLLocationCoordinate2D(latitude: 42.0, longitude: -75.0),
   //C.CLLocationCoordinate2D(latitude: 41.0, longitude: -87.0)]
  
       }
  override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!)
  {
      if (segue.identifier == "drawmap")
      {
          let navigationController = segue.destinationViewController as! UINavigationController
          let controller = navigationController.topViewController as! Map2ViewController
        //  controller.delegate = self
          controller.ar = self.arra
         }
  
  
     }
    override func viewDidLoad()
     {
         super.viewDidLoad()
     }
  </code></pre>
  
  <p>My Map2ViewController: (Which has MapView)</p>
  
  <pre><code>import UIKit
  import MapKit
  class Map2ViewController: UIViewController
  {
      var ar: [CLLocationCoordinate2D] = [CLLocationCoordinate2D]()
      @IBOutlet weak var dispAnnotation: MKMapView!
      override func viewDidLoad()
      {
          super.viewDidLoad()
          print("The values received are \(ar)")
      }   
  }
  </code></pre>
  
  <p>Please see: The segue name is "drawmap". The story board has SearchBloodViewController->NavigationController->Map2ViewController</p>