This is a newbie question, my apologies if it has been discussed in
the past. I haven't been programming on a Mac since the System 7 days
and trying to catch up with OS X and Cocoa...
I have text field bound to an NSObjectController with an
NSNumberFormatter to ensure that there are only integer numbers
entered. Whenever I leave the field blank or enter invalid characters,
I get a very generic error message "Formatting Error". I'd like to
customize that error message with a hint for the user which values are
valid (similar to the message I get in the standard print dialog when
entering zero copies), but I haven't found a way to do so, except for,
perhaps, subclassing NSNumberFormatter. I had a look at -
control:didFailToFormatString:errorDescription:, but noticed that the
error description is not a mutable string, therefore I cannot pass
back a modified error message. Is there a way to customize the error
message without having to create a new subclass of NSNumberFormatter
for each field with a different format?
On a related topic, if I set "Validates Immediately" on the binding of
that particular field, I was expecting to be stopped in my tracks as
soon as I enter, say, a letter instead of a number, but nothing
happens. It seems like the setting of the Validates Immediately flag
doesn't have any impact on the behavior. Am I missing something here?
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