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Bindings: Why Doesn't Key Value validation Update The UI?
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Bindings: Why Doesn't Key Value validation Update The UI?


  • Subject: Bindings: Why Doesn't Key Value validation Update The UI?
  • From: Keary Suska <email@hidden>
  • Date: Mon, 16 Feb 2009 15:49:36 -0700

I can't imagine why I haven't come across this before but it appears that when a key-value validation method alters the passed object and returns YES, the view is not updated with the coerced value.

I need behavior, for instance, where an NSTextField is supposed to display a numerical value that if the field is cleared that it is re- set to 0. Sounds simple, but I can't get it to work. Calling a KVC setter in validateKey (which could be bad) doesn't cause the update. Neither doing the same in the setter (also sounds like a bad idea anyway).

It seems like I have two options: set a transformer (that is really acting like a validator) or trick bindings with a change-value-for-key notice triggered using performSelector:afterDelay:.

Anyone have any better ideas?

TIA,

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

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