String型のEnumだけに縛りたいならこうかな？ #CodePiece

CodePiece.swift

protocol UUIDRepresentable: RawRepresentable {
}

extension UUIDRepresentable where Self.RawValue == String {
    func uuid() -> String {
        return self.rawValue
    }
}

enum hogeInt : Int, UUIDRepresentable {
    case one = 1
    case two = 2
}

enum hogeString : String, UUIDRepresentable {
    case foo = "foo"
    case bar = "bar"
}

// hogeInt.one.uuid() //Error
hogeString.foo.uuid()