I think it’s a case sensitivity issue. You can use “nil” or “NULL”, but not “NIL”. This works fine for me: NSPredicate *eventWithNoEndDate = [NSPredicate predicateWithFormat:@”endDate = nil”];
NSString *_mySearchKey = @”James”; NSPredicate *_myPredicate = [NSPredicate predicateWithFormat:@”(firstname CONTAINS[cd] %@) OR (lastname CONTAINS[cd] %@)”, _mySearchKey, _mySearchKey];
You’re trying to compare a collection (categories.name) to a scalar value (category.name). You need to either use a collection comparator (CONTAINS), or use a predicate modifier (ANY/ALL/SOME, etc). Try using: [NSPredicate predicateWithFormat:@”ANY categories.name =[cd] %@”, category.name]; Or: [NSPredicate predicateWithFormat:@”categories.name CONTAINS[cd] %@”, category.name];
Both other answers do only load contacts from the container with the defaultContainerIdentifier. In a scenario, where the user has more than one container (i.e. an Exchange and an iCloud account which both are used to store contacts), this would only load the contacts from the account that is configured as the default. Therefore, it … Read more
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.
It should work – as long as the data variable is actually an array containing a dictionary with the key SPORT NSArray *data = [NSArray arrayWithObject:[NSMutableDictionary dictionaryWithObject:@”foo” forKey:@”BAR”]]; NSArray *filtered = [data filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@”(BAR == %@)”, @”foo”]]; Filtered in this case contains the dictionary. (the %@ does not have to be quoted, this is done … Read more
What about NOT (CategoryID IN %@)?
Given a NSDate * startDate and endDate and a NSManagedObjectContext * moc: NSPredicate *predicate = [NSPredicate predicateWithFormat:@”(date >= %@) AND (date <= %@)”, startDate, endDate]; NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease]; [request setEntity:[NSEntityDescription entityForName:@”EntityName” inManagedObjectContext:moc]]; [request setPredicate:predicate]; NSError *error = nil; NSArray *results = [moc executeFetchRequest:request error:&error];