how to load child view controllers or container views - Swift

I don't have a problem displaying each container view when switching between them using the segmented controller. What I do have a problem with is that whenever the parent view loads, both the blue and green container views also load.

I want the blue to load with the parent view controller and the green to load only when I switch the segmented control. Any Ideas?

• By loading I mean that viewDidLoad, ViewDidAppear, ViewDidlayoutSubviews, etc.. gets called

override fund viewDidload() {
super.viewdidload()

   let child = GreenViewController()
   addChild(child)
   child.view.frame = frame
   view.addSubview(child.view)
   child.didMove(toParent: self)
}

I tried using the code above, but it doesn't seem to make a difference as loading for both child view controllers still load once the parent loads

As i understand there are 2 container views and you want to see the blue view when the segmented is first and you want to see the green view when the segmented is second if it is true the solution is like this;

You should init the uivew(hold on the ctrl and drag it to viewcontroller for both blue and green container view)(you need to add 2 different container view) and write

if segmented.selectedIndex == 0 { 

    greenView.isHidden = true
    blueView.isHidden = false

} else if segmented.selectedIndex == 1 {

    greenView.isHidden = false
    blueView.isHidden = true
}