如何将值从一个视图控制器传递给另一个swift？

Question

I'm building an iOS app using storyboards.I have implemented google maps in my app using swift.I'm getting address value in a label.I'm facing an issue to pass that label value to another class(First view controller) written in objective c.

What is happening right now in storyboards in first view controller i have a button and on click on that modal segue perform open second view controller contain map and this map view controller contain done button to dismiss the view controller and get bact to the first view controller.

Here is storyboard image:

here is my code:

Map View Controller code in swift:

func reverseGeocodeCoordinate(coordinate: CLLocationCoordinate2D) {
    let geocoder = GMSGeocoder()
    geocoder.reverseGeocodeCoordinate(coordinate) { response , error in

      //Add this line
      self.addressLabel.unlock()
      if var address = response?.firstResult() {
        println("label657656558568===\(address)");

        //  self.addressLabel.text=address.valueForKey ("GMSAddress") as? NSString;
        self.addressLabel.text=address.valueForKey ("subLocality") as? NSString;

        println("label===\(self.addressLabel.text)");
        let labelHeight = self.addressLabel.intrinsicContentSize().height
        self.mapView.padding = UIEdgeInsets(top: self.topLayoutGuide.length, left: 0, bottom: labelHeight, right: 0)
        UIView.animateWithDuration(0.25) {
             self.pinImageVerticalConstraint.constant = ((labelHeight - self.topLayoutGuide.length) * 0.5)
          self.view.layoutIfNeeded()
        }
      }
    }
  }
@IBAction func doTap(x:UIButton) {

     self.dismissViewControllerAnimated(true, completion: {});//This is intended to dismiss the Info sceen.
        println("pressed")

    }

Answer 1

you can use delegate protocols here to pass the value from MapViewController to FirstViewController. Here is the example link