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Re: NSValueTransformer vs. NSFormatter

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Re: NSValueTransformer vs. NSFormatter

Subject: Re: NSValueTransformer vs. NSFormatter
From: William Bumgarner <email@hidden>
Date: Sat, 15 Apr 2006 12:53:29 -0700

On Apr 15, 2006, at 12:18 PM, Guy Meyer wrote:

The formatting can be done by sub classing NSFormatter or NSValueTransformer.
Coding wise I think both implementation will require the same effort.
Which of the above is preferred ?

Formatters are for formatting data for presentation (and entry). I.e. formatters are explicitly aimed to the View layer.

Value transformers are, as their name implies, specifically to transform a value from one type to another. Often, a value transformer might be used to convert something from one type to a type that is compatible with a formatter.

From your description, it sounds like a formatter is more appropriate.

b.bum
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  >NSValueTransformer vs. NSFormatter (From: Guy Meyer <email@hidden>)




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