Re: NSFormatter Question
Re: NSFormatter Question
- Subject: Re: NSFormatter Question
- From: Matt Neuburg <email@hidden>
- Date: Sun, 31 May 2009 09:00:02 -0700
- Thread-topic: NSFormatter Question
On Sun, 24 May 2009 13:30:30 -0500, Dietmar Kuttelwascher <email@hidden>
said:
>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?
This might help:
http://www.cocoabuilder.com/archive/message/cocoa/2008/9/9/217770
m.
--
matt neuburg, phd = email@hidden, <http://www.tidbits.com/matt/>
A fool + a tool + an autorelease pool = cool!
AppleScript: the Definitive Guide - Second Edition!
http://www.tidbits.com/matt/default.html#applescriptthings
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