2/ I remembered Apple Health has a similar view, so I checked how they did it (realizing it might be a UIKit UIScrollView thing which would give you way more control).
Analyzing slo-mo footage of their switching I discovered they actually just kinda "cheat" and swap out a replacement chart which either animates from slightly wider or narrower than the final result. Which is a delightfully clever approach to a really tricky problem. Visually similar to a full solution but much simpler.
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