Given that most of your class attributes are optional, maybe it might make more sense to use a dictionary? Dictionaries don't mind if most of your "attributes" don't exist, and for TextField you can use a default value of "" if the dictionary entry doesn't exist. In the meantime, if you're set on using optional attributes, there's this:
StackOverflow
antoinedurr
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
User for