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 14:33:40 -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.
How would I create this programmatically?
I currently do:
NSPredicateEditorRowTemplate* template =
[[NSPredicateEditorRowTemplate alloc]
initWithLeftExpressions:leftExpressions
rightExpressionAttributeType:NSStringAttributeType
modifier:NSDirectPredicateModifier
operators:operators
options:0];
My leftExpression is the String value of the aspect ratio:
[NSExpression expressionForKeyPath:aspectRatio]
It is easy to create the category on NSString:
-(NSNumber)valueForAspectString:(NSString *)aString
But how do I get the predicate to pass the leftExpression (aspectString) to
this?
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