> Does anyone have any good suggestions as to how to update my search results 
> when the underlying source text changes? Do I have to listen for all changes 
> from the underlying text objects and try to adapt, or is there a better 
> pattern for doing this? Xcode does this nicely: no matter what changes you 
> make in the editor, the search results seem to be updated on the fly.

Couple of random suggestions:

* If you're using NSAttributedString, you can mark your search results by 
assigning custom attributes to specific ranges of text; as the text changes, 
those attributes will stick around and you can later find them using the 
attribute retrieval methods (I believe that's what Xcode does).

* As an alternative, a more naïve approach could be to simply repeat the search 
every time you detect the text changing, but depending on the size of your text 
files, that could eat up a lot of CPU cycles, and is just inelegant.

I'm sure there are other possibilities, too, but these two are the first ones 
that come to mind.

HTH,


—Mt.
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