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There is going to be quite a bit of UI in this app, so I decided to at least start sketching. Here's some ideas for an empty podcasts view and an "add something" view, which should probably be the first thing you see if there's nothing stored.
There is a lot to fit in the episode view, where most of the user's time will be spent, so I thought of a table view first. That is probably going to feel cramped, so I drew out a list of hopefully scannable subviews.