Overlapping Views in UIStackView

This Swift solution reverses the stack view subview order using the UIView method sendSubviewToBack(_:) (docs here):

@IBOutlet weak var stackView: UIStackView!

for view in stackView.arrangedSubviews {
    stackView.sendSubviewToBack(view)
}

As we advance through the stack view's arranged views (from bottom to top), the later (i.e. higher) views get pushed to the bottom, thereby reversing the order :-)

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Something for 2022:

Even Swiftier...

@IBOutlet weak var stackView: UIStackView!

stackView.arrangedSubviews.forEach({ stackView.sendSubviewToBack($0) })

The documentation for the UIStackView class tells that:

The order of the subviews array defines the Z-order of the subviews. If the views overlap, subviews with a lower index appear behind subviews with a higher index.

which is exactly what I experienced in the question. To over come my specific case I did the trick of changing the semantic of the view to be RTL as can bee seen here:

This is not covering the a generic case because a device may have been set a RTL language in its global settings. For the generic case I guess I will need to check the interface semantic and force an opposite direction to my stack view.

P.S. It's kind of hack so any ideas about how to reorder the Z-order of subviews in a different way will be most welcome!