iOS7 UICollectionView如何使用动画将单个单元格移动到其他部分？

Question

I have an app with a list of articles that a user can read. Once the user taps an article, I want to present it to the user, and then animate moving the cell representing an article to a different collection view section, representing read articles:

Unread  | Read
0 0 0 0 | X X

The code below causes all cells to reload, which looks like all of them flashing with background color. Is there a way for me to animate moving once cell from one section of a collection view to another?

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    if([collectionView isEqual:self.largeCollectionView])
    {
        //position the tapped image at the end and animate reload
        UIImage* image = largeImages[indexPath.row];
        [largeImages removeObjectAtIndex:indexPath.row];
        [largeImages addObject:image];
    }


    [collectionView performBatchUpdates:^{
         [collectionView reloadSections:[NSIndexSet indexSetWithIndex:0]];
    } completion:^(BOOL finished) {

    }];

}

Answer 1

Have you looked at -moveItemAtIndexPath:toIndexPath: ? It sounds like that provides exactly what you are looking for.

You appear to be changing the data backing your collection view and then relying on -reloadSections: to update the UI. That unsurprisingly reloads every cell in the section. Since you know exactly what changes you have been performed you could at least use -deleteItemsAtIndexPaths: and -insertItemsAtIndexPaths: to indicate exactly where you removed and re-inserted this image.