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NSPredicate and custom sort selector
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NSPredicate and custom sort selector


  • Subject: NSPredicate and custom sort selector
  • From: Trygve Inda <email@hidden>
  • Date: Thu, 29 May 2014 12:52:52 -0700
  • Thread-topic: NSPredicate and custom sort selector

I have an array of objects. One property of this object is a ratio stored as
a string (e.g. 5:8, 9:4, 21:2) etc.

I have a category on NSString:

-(NSComparisonResult)compareAspectString:(NSString *)aString

This does the division and compares the aspect ratios correctly.

Now I need a predicate to do this.

My Predicate says:

Printing description of predicate:
aspectRatio >[cd] "4:3"

But it is just doing straight string comparison. How can I get the predicate
to use by comparison method?

The columns in my NSTableView are able to use this custom sort function...
Seems a predicate should be able to use it too.

Thanks,

Trygve



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