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Thanks for the opportunity to review this code. I've inserted my comments inline with the code. Each comment starts with SH-COMMENT.
My overall comment is that this code could use a bunch of refactoring to make it succinct. Also, there are serveral places where forced unwrapping of optionals are used, which can lead to an App crash. I would replace most with optional chaining and deal with the nil values gracfully (e.g., default values or error messages).
Thanks, Steig Hallquist