Hopefully a simple question for a relatively new UIKit control

I have a UICollectionView that has a viewLayout with a single row of cells that are the exact height of the UICollectionView bounds in Portrait mode

Therefore, when the iPad is flipped to Landscape mode, that row becomes taller than the screen itself, at which point the layout (almost) silently fails and complains that the row is taller than the bounds.

What is the ideal way to manipulate the characteristics of the viewLayout, particularly as it relates to responding to rotation in a ViewController?

iphone ios uikit uicollectionview
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