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Re: Preventing empty NSTextFields that use NSNumberFormatter
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Re: Preventing empty NSTextFields that use NSNumberFormatter


  • Subject: Re: Preventing empty NSTextFields that use NSNumberFormatter
  • From: Keary Suska <email@hidden>
  • Date: Mon, 04 Aug 2014 15:31:16 -0600

On Aug 4, 2014, at 12:01 PM, Sean McBride <email@hidden> wrote:

> NSNumberFormatter, applied to an NSTextField, will very nicely reject things like letters, and optionally a bunch of things like negative numbers, non-integers, etc.
>
> But I've just noticed that it doesn't seem to help if the textfield is left entirely empty.  Is that not something NSNumberFormatter can help with?  I just find that surprising with all the other options it has...

Unfortunately, no.

> If it can't, I guess the best choices are using NSControlTextEditingDelegate or key value validation...?

Yes, or subclass. If your backing property is a C primitive you could use setNilValueForKey to force nil to mean something.

HTH,

Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"


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References: 
 >Preventing empty NSTextFields that use NSNumberFormatter (From: Sean McBride <email@hidden>)

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