cocoa - KVC select by criteria -

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I have the objects selected from the core objects. I choose from a subset of this set of conditions, which is in conformity with the condition. How to do this

If I read you correctly, then you want to filter your condition based on a condition By some objects in it?

You can do this by using NSPredicate and call on your array. 

  NSPredicate * predicate = [NSPredicate predicateWithFormat: @ "attribute == Yes"]; NSArray * filtered array = [original array filtered attribution: prediction];

You can read more about using predicates.

You can filter your NSFetchRequest directly while getting data from the core Can use predicates for data


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