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AQGridView backed by a NSFetchedResultsController

I'm trying to implement a AQGridView that uses a fetched results controller as its datasource.

I'm not particular sure how to handle the NSFetchedResultsController delegate methods using the grid view; namely the content changing ones. I understand how to use the FRC for the other grid view datasource delegates.

Could somebody point me in the right direction?

like image 205
Anthony Wong Avatar asked Dec 01 '11 20:12

Anthony Wong


1 Answers

The result should look a little something like this:

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
  [gridView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
       atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
{
  switch(type)
  {
    case NSFetchedResultsChangeInsert:
      break; 
    case NSFetchedResultsChangeDelete:
      break;
  }
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
   atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
  newIndexPath:(NSIndexPath *)newIndexPath
{

  ChannelPageViewController *currentPageController, *destinationPageController;

  NSIndexSet * indices = [[NSIndexSet alloc] initWithIndex: indexPath.row];
  NSIndexSet *newIndices = [[NSIndexSet alloc] initWithIndex:newIndexPath.row];

  switch(type) {
      case NSFetchedResultsChangeInsert:
        [gridView insertItemsAtIndices:newIndices withAnimation:AQGridViewItemAnimationNone];
      break;

      case NSFetchedResultsChangeDelete:
        [gridView deleteItemsAtIndices:indices withAnimation:AQGridViewItemAnimationNone];
        break;

      case NSFetchedResultsChangeUpdate:
        [gridView reloadItemsAtIndices:indices withAnimation:AQGridViewItemAnimationNone];
        break;

      case NSFetchedResultsChangeMove:
        [gridView deleteItemsAtIndices:indices withAnimation:AQGridViewItemAnimationNone];
        [gridView insertItemsAtIndices:newIndices withAnimation:AQGridViewItemAnimationNone];
        break;
   }
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
  [gridView endUpdates];
  if ([[frc fetchedObjects] count] == 1) {
    [gridView reloadData];
  }

}
like image 158
Audun Kjelstrup Avatar answered Oct 22 '22 09:10

Audun Kjelstrup