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Intelligent NSFormatter

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Intelligent NSFormatter

Subject: Intelligent NSFormatter
From: Mike Abdullah <email@hidden>
Date: Thu, 14 Sep 2006 20:14:22 +0100

I am wanting to implement in my app an NSTextField for displaying and editing dates using Cocoa Bindings. Normally I would make use of an NSValueTransformer or NSFormatter, but that doesn't work quite like I want.

Here's the requirements:

* The text field should display the date as text using the user's NSShortDateFormatString preference

* As the user types, if a valid date is entered, the field should change its text to the default way of displaying the date (I'm not entirely sure about this one yet!)

* If the user ends editing of the text field without entering a valid date, the text field should revert to the last valid date they entered.

So, is this possible with NSFormatter and NSValueTransformer (and that therefore I've missed something), or do I need a different method. If so, what would people recommend?

Mike.
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