PageViewController transparent or no background - swift

Question

I have problem with PageViewController dots indicators. Actually with background. I tried UIColor.clear but this didn't help. Background still white. I can change the color but I don't know how to remove it or make it transparent.
Can't find a way how to make it transparent.
Screenshot attached.
How to make background color transparent or remove it?
ViewController.swift
import Foundation
import UIKit
class ViewController: UIViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
// Hide status bar.
override var prefersStatusBarHidden : Bool {
return true
}
var pageViewController: UIPageViewController!
let pages = ["DomesticPageViewController", "SafariPageViewController", "ForestPageViewController"]
// Page View Controller Datasource
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
if let index = pages.index(of: viewController.restorationIdentifier!) {
if index > 0 {
return viewControllerAtIndex(index - 1)
}
}
return nil
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
if let index = pages.index(of: viewController.restorationIdentifier!) {
if index < pages.count - 1 {
return viewControllerAtIndex(index + 1)
}
}
return nil
}
func viewControllerAtIndex(_ index: Int) -> UIViewController? {
let vc = storyboard?.instantiateViewController(withIdentifier: pages[index])
return vc
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
if let vc = storyboard?.instantiateViewController(withIdentifier: "MyPageViewController") {
self.addChildViewController(vc)
self.view.addSubview(vc.view)
pageViewController = vc as! UIPageViewController
pageViewController.dataSource = self
pageViewController.delegate = self
pageViewController.setViewControllers([viewControllerAtIndex(0)!], direction: .forward, animated: true, completion: nil)
pageViewController.didMove(toParentViewController: self)
}
}
private func setupPageControl() {
let appearance = UIPageControl.appearance()
appearance.pageIndicatorTintColor = UIColor.lightGray
appearance.currentPageIndicatorTintColor = UIColor.black
appearance.backgroundColor = UIColor.clear
}
func presentationCount(for pageViewController: UIPageViewController) -> Int {
setupPageControl()
return self.pages.count
}
func presentationIndex(for pageViewController: UIPageViewController) -> Int {
return 0
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
DomesticViewController.swift
import Foundation
import UIKit
class DomesticPageViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let backgroundImage = UIImageView(frame: UIScreen.main.bounds)
backgroundImage.image = UIImage(named: "domestic_bg1")
backgroundImage.contentMode = UIViewContentMode.scaleAspectFill
self.view.insertSubview(backgroundImage, at: 0)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}