A 25-minute UIKit exercise. A small logo view has to move through the four corners in order, top-left, top-right, bottom-right, bottom-left, forever, like the old DVD screensaver. How would you implement it?
Keep the four target frames in an array and chain calls: in UIView.animate's completion, call the same function again with the next index. .repeat only repeats a single block and can't express a four-leg path.
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