Detect Segue or Navigation

I don't understand why you need it.

You could do it programmatically.

In the destination controllers, test for self.navigationController in viewDidload:

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        print(self.navigationController == nil ? "not nav" : "nav") 

If the destination is in a navigation stack, it is not nil.
If it comes from a "pure" segue, it will be nil.
However, if the originating VC is in a navigation stack, it will not be nil.
To differentiate in that case, you would need to add a property in the destination

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var comesFromSegue : Bool = false

and set it true in the prepare for segue.

Note: you could encapsulate all this into a UIViewController subclass, overriding viewDidLoad

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var comesFromSegue : Bool?	// Must be set in prepare; we assume here that there are only 2 cases: segue of nav
override func viewDidLoad() {
        super.viewDidLoad()
		if comesFromSegue == nil {		// Then it was NOT set in a prepare, but segue we could be in a navigation stack anyway
			comesFromSegue = self.navigationController == nil  // Do we really come from a navigation ? Otherwise, we assume it is segue
		} // else { comesFromSegue = true } as set in prepare
}

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