CODEWITHSUNDEEP
iosobjective-cnspredicate
Doz
Doz

Reputation: 7149

NSPredicate to test for NULL, and blank strings

I have an NSArray and need to filter out any strings that are null or rather, have ' ' (empty string). How do I do that? I have tried doing:

NSPredicate *predicateName = [NSPredicate predicateWithFormat:@"(name!=nil)"];

but that doesn't seem to work. Or maybe it does but there are different kinds of null...

Upvotes: 78

Views: 64128

Answers (4)

Dave DeLong
Dave DeLong

Reputation: 243146

If you don't use Core Data, you could do:

NSPredicate *predicateName = [NSPredicate predicateWithFormat:@"name.length > 0"];

If the string is empty, this will fail (because 0 == 0). Similarly, if name is nil, it will also fail, because [nil length] == 0.

Upvotes: 153

chroww
chroww

Reputation: 183

 NSPredicate *predicateName = [NSPredicate predicateWithFormat:@"name!=NULL"];

Upvotes: 14

Josip B.
Josip B.

Reputation: 2464

This predicate worked for me:

[NSPredicate predicateWithFormat:@"(%K== nil) OR %K.length == 0", @"imageUrl", @"imageUrl"]

Upvotes: 7

José Manuel Sánchez
José Manuel Sánchez

Reputation: 5225

I think this should work:

NSPredicate *predicateName = [NSPredicate predicateWithFormat:@"name!=nil AND name!=''"];

Upvotes: 90

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