Question

I encountered a strange problem regarding CoreData and boolean values:
In my data model I have set an entity’s property to BOOL. Later I set theEntity.theBooleanValue = [NSNumber numberWithBool:NO] and save the object. So far so good, but when I try to check for the saved property’s value with if ([theObject valueForKey:@"theBooleanValue"] == [NSNumber numberBOOL:NO]){//do something} it never jumps into the if clause. But if I check for == [NSNumber numberWithInt:0] its working… so basically I try to save a bool but it’s recognized as an int… Any ideas what’s going on there?

Answer 1

It makes more sense to examine [[theObject valueForKey:@"theBooleanValue"] boolValue] for me. i.e.,

if(![[theObject valueForKey:@"theBooleanValue"] boolValue])
{
    // Your code
}

I think == operator compares the object pointer, and not the number itself. To compare number there is a separete method [NSNumber isEqualToNumber:].