Describe how you would identify the closest common ancestor in a view hierarchy between two UIViews.

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Anonymous · Accepted Answer

For the first UIView I would iterate up the chain of each UIView's parent
property adding each parent to a Dictionary or Set. For the next UIView I would
then follow the same process but I would be comparing against the existing
Dictionary or Set. The first parent that I find matching in the dictionary or
set I know is the lowest common parent of the two UIViews

Anonymous · Answer

if we have 2 views, I would create a set of view, going up in the heirchery
using view.superview, If I find that both the parent views are same or if any of
the parent view was already in the set, then I have the answer.

Describe how you would identify the closest common ancestor in a view hierarchy between two UIViews.

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