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Editorial Team
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Asked: 2026-05-23T07:50:14+00:00

NSPredicate * thePredicate1= [NSPredicate predicateWithFormat: @Title CONTAINS[cd] %@, searchTerm]; If searchterm is an empty

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NSPredicate * thePredicate1= [NSPredicate predicateWithFormat: @"Title CONTAINS[cd] %@", searchTerm];

If searchterm is an empty string a search using thePredicate1 should return all right?

Wrong.

If it’s nil it’ll return an error.

My problem is I have to create a special case. So if Title is empty (or nil) then I will have to create a predicate that always return true. Because CONTAINS “” always return false.

I think Contains @”” should always return true. Every string contain an empty string

What’s their consideration when they have this issue?

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1 Answer

  1. Editorial Team
    NSLog(@"%@", [NSPredicate predicateWithFormat:@"Title CONTAINS[cd] %@", @""]);
NSLog(@"%@", [NSPredicate predicateWithFormat:@"Title CONTAINS[cd] %@", nil]);

    Logs:

    2011-06-18 17:53:44.037 EmptyFoundation[11247:903] Title CONTAINS[cd] ""
2011-06-18 17:53:44.040 EmptyFoundation[11247:903] Title CONTAINS[cd] nil

    What’s your problem again? Is searchTerm not an object?

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