Using the same property name/reference for Outlets

So I have a base class UIViewController called UITabBarTopLevelViewController:

class UITabBarTopLevelViewController: UIViewController {

@IBOutlet weak var uiNavItemTitle: UINavigationItem!

override func viewDidLoad() {
    super.viewDidLoad()
    uiNavItemTitle.titleView = CoreUtility.LogoForUINavBarGet()
    // Do any additional setup after loading the view.
}

I then have two UIViewControllers that inherit from my base class and both look like this, except the second is called MyViewController2:

class MyViewController1: UITabBarTopLevelViewController {

//@IBOutlet weak var uiNavItemTitle: UINavigationItem!

override func viewDidLoad() {
    super.viewDidLoad()
    //uiNavItemTitle.titleView = CoreUtility.LogoForUINavBarGet()

}

I add a Navigation Bar object to each child UIViewController super view and then I CTRL drag and add a new outlet to each UIViewController child class:

And here is the second CTRL drag outlet:

These are different references, but I can comment out the @IBOutlet weak var uiNavItemTitle: UINavigationItem! in my child classes and reference one time only in the base class UITabBarTopLevelViewController, for both MyViewController1 and MyViewController2.

You can see, when I hover over the outlet circle, in my base class, it highlights both UINavigationItem in the Story Board:

I am surprised this works, its nice for me that it works because I only need to set the uiNavItemTitle.titleView for my logo one time for both views. This is what I want but there seems to be a bit of magic that I can reference multiple outlet references one time in my base class and there is no bugs or crashes.

I currently have no memory leaks or crashes and my app is working just fine and doing exactly as I desire.

Will there be any bugs with this?

Could someone explain how this is working?

Is the fact that this works, not surprising to experienced Swift developers?

That's how subclass exactly works.

You placed a UINavigationItem in the base class UITabBarTopLevelViewController through

uiNavItemTitle.titleView = CoreUtility.LogoForUINavBarGet()

Also, MyViewController1 and MyViewController2 inherit from the base class UITabBarTopLevelViewController. That's say these child viewControllers both have a UINavigationItem which inherit from their UITabBarTopLevelViewController.

This is not a bug, on the other hand, more like a topic about design pattern though. You could place all the base stuff into a base class, inherit from those classes and implement the specific detail within the child class.

HTH.