Enums vs. OptionSetType

[MaddTheSane]

At a cursory glance of UIView, it seems that some of the enums defined there, like UIViewAutoresizing, could be better served as OptionSetTypes.

[unifiedh]

Yup, thanks for notifying me about this. OptionSetTypes would be much better than enums in cases like UIViewAutoresizing, as they were initially defined as NS_OPTIONS with the original Objective-C code.
Although I migrated most of the Objective-C code to Swift myself, a small part of them was migrated with an automated code transpiler to save time. I thought I fixed most of the awkward code it produced. It seems the transpiler I used for this project translated Objective-C's NS_OPTIONS to enums instead of OptionSetTypes. I will check the rest of the code to see if there are any NS_OPTIONS translated as enums are left behind.