Glad to help. I’ve spent a long time trying to learn iOS design. There is are some very good tutorials available on https://www.raywenderlich.com. The subscription stuff is pretty expensive but the beginning tutorials are all free and the newsletter is usually pretty good.
BTW the playgrounds are a handy way to learn Swift and a good way to explore AudioKit, but a real UI is typically designed using the Xcode editor which allows you to design your views graphically.
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