Swift enums are effectively discrimated unions, which are really, really different from C (and thus, Obj-C) enums. For example, in Swift, you can have an enum

Swift enums are effectively discrimated unions, which are really, really different from C (and thus, Obj-C) enums. For example, in Swift, you can have an enum which says its values holds exactly one of: A) several specific semantically meaningful strings B) some other object C) several objects In Obj-c, you would probably express this as a single object, and write a bunch of error prone logic to handle which of these states you’re in, possibly missing an important last minute addition in one of your methods for walking over all the possible state.