On May 12, 2015, at 15:38 , Quincey Morris
<quinceymor...@rivergatesoftware.com> wrote:
>
> dynamic var message: String
> dynamic var messageIsEmpty: Bool {return String == “”}
> static var keyPathsForValuesAffectingMessageIsEmpty: NSSet {return NSSet
> (object: "messageIsEmpty”)}
FWIW, a Swift-ier way to do this might be something like:
dynamic var message: String = "" {
didSet {messageIsEmpty = message == ""}
}
private(set) dynamic var messageIsEmpty: Bool = true
This is at the cost of actually storing the derived property value, though
that’s not likely to be a problem in window controller.
(Again, not tested.)
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