RE: NSFormatter Question
RE: NSFormatter Question
- Subject: RE: NSFormatter Question
- From: Ulai Beekam <email@hidden>
- Date: Sun, 24 May 2009 19:51:49 +0000
- Importance: Normal
You're right, you can't edit the formatter's error in control:didFailToFormatString:errorDescription: because the error description has already been determined.
You need to override the getObjectValue:forString:errorDescription: method of NSFormatter to set a custom error description.
As for disallowing invalid characters while typing, which is probably what you want (in addition to an NSBeep() perhaps), you should look at the isPartialStringValid:newEditingString:errorDescription: method in NSFormatter.
----------------------------------------
> From: email@hidden
> To: email@hidden
> Date: Sun, 24 May 2009 13:30:30 -0500
> CC:
> Subject: NSFormatter Question
>
> 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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