Re: NSPredicate and custom sort selector
Re: NSPredicate and custom sort selector
- Subject: Re: NSPredicate and custom sort selector
- From: Trygve Inda <email@hidden>
- Date: Fri, 30 May 2014 14:56:01 -0700
- Thread-topic: NSPredicate and custom sort selector
> Create a property-styled category on NSString that returns the numeric value
> of a ratio-string -- call it "ratioValue" perhaps. Then you can have a
> predicate format of the form:
>
> @"self.ratioValue > %@.ratioValue"
>
> -- or whatever.
>
> The same category would be useful in KVC collection operations.
>
> Kirk Kerekes
> (iPhone)
As a followup:
I can make the lefExpression keypath "aspectRatio.ratioValue"
But how would I make what the User enters in the Predicate Editor text field
pass through the ratioValue method?
If I just change the leftExpression to "aspectRatio.ratioValue" that changes
one side of the comparison, but what the user has entered is still a string
like "4:3".
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