This response is a bit late, but here is my solution:
(nullable NSNumber*)isDone:(NSError* _Nullable * _Nullable)error
And then in swift:
let result = try obj.isDone().boolValue
Not exactly what you wanted, but close enough IMHO.
iMoses
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
Last seen
User for