iOS devs - how do I refactor an existing table view controller as a table view in a single collection cell of a collection view? 🐥

You would need to create a custom CollectionViewCell that contains a TableView and then implement the delegate methods inside this CustomCollectionViewCell class. You can do this using Storyboards.

On another note... I would suggest you use IGListKit for complex CollectionViews :) It will make your life easier and will keep your app running smooth!!!

Yes. Made some code you can use for reference.
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FYI, Brian Voong's LBTA's tutorials are amazing to learn how to use CollectionViews and embedded CollectionViews. Available for free on YouTube!