Call a View from another ViewController Swift - swift

Question

I have a ViewController that has a UIView set on top of it and a button that opens a popover to another ViewController. I want a button on the popover view controller to set the UIView to disable. How do I reference the UIView from the first view controller from a button in the second view controller?
EDIT:
Below is code that I use to call the popover view controller. Notice how I call dimView.isHidden = false from this first viewcontroller. I want to run dimView.isHidden = true from the popover view controller.
let popover = storyboard?.instantiateViewController(withIdentifier: "PopoverVC")
popover?.modalPresentationStyle = .popover
popover?.popoverPresentationController?.delegate = self as? UIPopoverPresentationControllerDelegate
popover?.popoverPresentationController?.sourceView = self.view
popover?.popoverPresentationController?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
popover?.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
dimView.isHidden = false
self.present(popover!, animated: false)
EDIT 2:
Below is my popover view controller. Since it is not called PopoverVC. I updated the answer to include let popover = storyboard?.instantiateViewController(withIdentifier: "PopoverVC") as! PopOverViewController but still no luck.
import UIKit
var parentController:UIViewController?
class PopOverViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func closeButton(_ sender: Any) {
self.dismiss(animated: false, completion: nil)
}
}
EDIT 3:
class ViewController: FormViewController {
override func viewWillAppear(_ animated: Bool) {
dimView.isHidden = true
}
#IBOutlet weak var dimView: UIView!

Answer 1

You can pass a reference to your current view controller when presenting your PopoverVC and then you can access its view from PopoverVC. Just create a property in PopoverVC that can store the reference, like var parentController:UIViewController?
let popover = storyboard?.instantiateViewController(withIdentifier: "PopoverVC") as! PopoverViewController
popover?.modalPresentationStyle = .popover
popover?.popoverPresentationController?.delegate = self as? UIPopoverPresentationControllerDelegate
popover?.popoverPresentationController?.sourceView = self.view
popover?.popoverPresentationController?.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
popover?.popoverPresentationController?.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
popover?.dimView = self.dimView
dimView.isHidden = false
self.present(popover!, animated: false)
PopOverViewController:
class PopOverViewController: UIViewController {
var dimView:UIView?
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func closeButton(_ sender: Any) {
self.dismiss(animated: false, completion: nil)
}
}