The most direct way to do what you want would be to use a validator instead
of a formatter, but you *could* use a formatter if you have some trigger
value, say, an equals character. If you evaluate the "expression" only when
the string value ends in an equals, you will probably get what you want.
The problem with using a validation method is that it's associated with
the core data object, rather than the text field, yes? Actually, in
this case that's probably fine, but I would eventually like to make a
"calculating text field" as something in my tool box, that would work
regardless of what it was bound to.
You did mean a validation method when you said "validator", right? Is
there a way to have a separate validator object of some sort?
I remember that I also tried to use an NSValueTransformer; I'm not sure
anymore why I backed off from that approach.
Thanks to both of you, anyhow, I will experiment with allowing errors,
and with using a validation method.
Niko
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