Children UIViewControllers of UITabBarController overlapping Status Bar - ios

Question

Xcode 7
iOS Target 9.3
Swift 2
I have created a new Tabbed Application in Xcode:
I changed the background of the first template generated UIViewController super view to gray and then I run the app, as you can see in this screenshot the First UIView is overlapped by the Status Bar:
I have read many articles, particulary specified to iOS 7 regarding allocating space for the Status Bar.
I also read on apple.developer.com the following quote:
"Applications that use an opaque UINavigationController or UITabBarController automatically keep their content below the status bar."
In general this link on the apple.developer.com website does seem a bit outdated.
But, with that said, I am expecting the UITabBarController to load the tabbed children views with with space allocated for the status as displayed in the Storyboard for the UITabBarController:
I have tried adding the following to my UITabBarController class:
override func viewDidLoad() {
super.viewDidLoad()
self.edgesForExtendedLayout = UIRectEdge.None
self.automaticallyAdjustsScrollViewInsets = false;
}
I have looked at many Stackoverflow question and answer threads, I found this person asking the same question on Stackoverflow:
Using UITabBarController but status bar covers view
I do know how to add a constraint to the Top Layout Guide to each parent view in each UiViewController tab but I am trying to avoid adding a new top level UIView because my existing UIViewControllers tabs all have UILabels, UIButtons, UICollections, etc in the SuperView I cannot add a constraint to Top Layout Guide to the SuperView in Xcode Storyboard.
With the SuperView I cannot add a Top Level Constraint by Control Dragging it seems:

Answer 1

iOS handles this for you inside of auto layout. Whilst the view extends underneath the status bar, fix your constraints to be 0 distance in the 'Vertical Spacing to top layout guide' constraint and you will find it sits underneath the status bar as expected.

Answer 2

So I found through the help of #SeanCAtkinson that things are working as the should. I needed add a constraint to the Top Layout guide for any UIViewController that was a tab aka a child of my UITabBarController.
I thought any child that was tab would be displayed with spaced allocated for the Status bar. I thought UITabBarController was doing that, based on how it looks in the Xcode 7 Storyboard:
As you can see from the screenshot, the UITabBarController implies that tabs will display within the light grey square, which you can see has top "guid" below the status bar.
It just isn't the case the UITabBarController will stop the Status Bar from overlapping children tabs whether UIViewControllers, UICollectionViewControllers or UITableViewControllers, etc. You have to use the Top Layout Guide constraint your children tabs.
What partcularly confusing is that a SuperView cannot have the Top Layout guide contraint, the SuperView will always be full screen.