Force redisplay of NSTextField after NSFormatter subclass change
Force redisplay of NSTextField after NSFormatter subclass change
- Subject: Force redisplay of NSTextField after NSFormatter subclass change
- From: Jonathan Fewtrell <email@hidden>
- Date: Tue, 27 Nov 2007 16:27:23 +0000
I have an NSTextField bound to a certain key in a Core Data model
entity. A switch in the interface allows the user to display the
value in either of two formats. The formats are quite different, so I
have two different NSFormatter subclasses and I set the appropriate
one when the user toggles the switch. I find that the displayed value
immediately after a switch is spurious, So I want to force the field
to redisplay. Nothing I try seems to get it to redisplay. I have
tried the following:
sending -setNeedsDisplay: to the field
sending -display to the field
setting the field hidden and then unhidden
sending a -willChangeValueForKey: / -didChangeValueForKey; pair to
the model object
It appears that because the underlying value of the key (which is an
NSNumber) does not change, the field refuses to update. The only way
I can get it to work is to change the value of the key and change it
back again. But this seems a clumsy hack. Is there a better way?
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