NSPredicate to test for NULL, and blank strings

Asked 2011-09-10T03:19:07.150

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...

ios objective-c nspredicate

Edit Report

1 Answer

153

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.

answered 2011-09-10T04:15:03.280