How to pass data from child to parent view controller? in swift

Question

I created an activity where when one of the text fields clicked it will pop up a child(alert dialog) with list of product but when i click one item on the list I can\'t disp

Answer 1

In ChildVC(ViewPopUpProduct) add instance of ParentVC

class ViewPopUpProduct: UIViewController {
  var parentVC = ViewAward? //ParentView
  var someValueToSend : String? 
  .
  .
  .
  fun sendData(){
    // After fetching some value call this function from child
    parentVC.result = someValueToSend
    self.view.removeFromSuperview()
  }
}

In Parent View While you invoke child(subview) share the instance

class ViewAward: UIViewController{

   var result = String?//Variable to store result from child

   func productTapped(textfield: UITextField){

    //tfProduct.endEditing(true)
    tfProduct.resignFirstResponder()

    let popOverVC = UIStoryboard(name:"Main",bundle:nil).instantiateViewControllerWithIdentifier("sbPopUpID") as! ViewPopUpProduct

    popOverVC.parentVC = self//Sharing Parent Views Instance

    self.addChildViewController(popOverVC)

    popOverVC.view.frame = self.view.frame

    self.view.addSubview(popOverVC.view)

    popOverVC.didMoveToParentViewController(self)
 }
}

now after removing the child view Access the Result variable and enjoy!