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Asked: 2026-05-27T19:08:05+00:00

I have a model ‘Pens’ and it has such properties: makerName and Count. How

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I have a model ‘Pens’ and it has such properties: “makerName” and “Count”. How can I get sum of all ‘Count’ ? Can Core Data count that for me ? Thanks…

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  1. Editorial Team

    There are two ways to solve this problem:
    first – get your data to NSSet or NSArray and use @sum operator:

    //assume that `pens` are NSArray of Pen
NSNumber *countSum=[pens valueForKeyPath:"@sum.count"];

    second is using specific fetch for specific value with added NSExpressionDescription with a sum. This way is harder but better for larger db’s

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