NSCompoundPredicate

Question

I'm trying to filter a UITableView's data using a UISearchDisplayController and NSCompoundPredicate. I have a custom cell with 3 UILabels that I want to all be filtered within the search, hence the NSCompoundPredicate.

  // Filter the array using NSPredicate(s)

  NSPredicate *predicateName = [NSPredicate predicateWithFormat:@"SELF.productName contains[c] %@", searchText];
  NSPredicate *predicateManufacturer = [NSPredicate predicateWithFormat:@"SELF.productManufacturer contains[c] %@", searchText];
  NSPredicate *predicateNumber = [NSPredicate predicateWithFormat:@"SELF.numberOfDocuments contains[c] %@",searchText];

  // Add the predicates to the NSArray

  NSArray *subPredicates = [[NSArray alloc] initWithObjects:predicateName, predicateManufacturer, predicateNumber, nil];

  NSCompoundPredicate *compoundPredicate = [NSCompoundPredicate orPredicateWithSubpredicates:subPredicates];

However, when I do this, the compiler warns me:

Incompatible pointer types initializing 'NSCompoundPredicate *_strong' with an expression of type 'NSPredicate *'

Every example I've seen online does this exact same thing, so I'm confused. The NSCompoundPredicate orPredicateWithSubpredicates: method takes an (NSArray *) in the last parameter, so I'm REALLY confused.

What's wrong?

Answer 1

orPredicateWithSubpredicates: is defined to return an NSPredicate*. You should be able to change your last line of code to:

NSPredicate *compoundPredicate = [NSCompoundPredicate orPredicateWithSubpredicates:subPredicates];

... and still have all of the compoundPredicates applied.