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Session: https://360idev.com/sessions/graphing-with-custom-collection-view-layouts/
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Code: https://github.com/JobsIsMyHomeboy/CollectionViewGraphing
Brian Miller
(Presentation was largely code walkthrough.)
With default collection view layouts, collection views typically present data in a sequential manner. With custom layouts you can lay out items however you want.
The example used in the talk was a circular scatterplot-type graph. Each dot (or data point) is its own collection view cell, with the layout determining where it's placed onscreen.