indexAirportData.m

- (void)indexAirportData
{
   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
      for (ALAirport* airport in self.airports)
      {
         // Create the attribute set
         CSSearchableItemAttributeSet* attributeSet = [[CSSearchableItemAttributeSet alloc] initWithItemContentType:(NSString*)kUTTypeItem];
         
         attributeSet.displayName = airport.airportName;
         attributeSet.latitude = @(airport.coordinate.latitude);
         attributeSet.longitude = @(airport.coordinate.longitude);
         attributeSet.thumbnailData = UIImagePNGRepresentation([UIImage imageNamed:@"AppIcon"]);
         
         // Create the searchable item
         CSSearchableItem* item = [[CSSearchableItem alloc] initWithUniqueIdentifier:airport.airportIdentifier
                                                                    domainIdentifier:@"airports"
                                                                        attributeSet:attributeSet];
         
         [[CSSearchableIndex defaultSearchableIndex] indexSearchableItems:@[item]
                                                        completionHandler:^(NSError * _Nullable error) {
                                                           NSLog(@"Indexed: %@", airport.airportName);
                                                        }];
      }
   });
}