Why do my table view cells disappear when reloaded using reloadRowsAtIndexPaths?

Question

I have a bare-bones sample project here:

http://dl.dropbox.com/u/7834263/ExpandingCells.zip

In this project, a UITableView has a custom UITableViewCell. In each

Answer 1

I think you should not retain the previous indexPath when the cell is not expanded, try by modifying you did select method like the below, its working fine..

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
BOOL currentCellSameAsPreviousCell = NO;
NSMutableArray *indicesToReload = [NSMutableArray array];

if(previousIndexPath_ != nil)
{
    if( [previousIndexPath_ compare:indexPath] == NSOrderedSame ) currentCellSameAsPreviousCell = YES;

    JVCell *previousCell = (JVCell*)[self cellForIndexPath:previousIndexPath_];

    BOOL expanded = [previousCell expanded];
    if(expanded) 
    {
     [previousCell setExpanded:NO];
    }
    else if  (currentCellSameAsPreviousCell)
    {
        [previousCell setExpanded:YES];
    }
    [indicesToReload addObject:[previousIndexPath_ copy]];

    if (expanded)
        previousIndexPath_ = nil;
    else
        previousIndexPath_ = [indexPath copy];         
}

if(currentCellSameAsPreviousCell == NO)
{
    JVCell *currentCell = (JVCell*)[self cellForIndexPath:indexPath];

    BOOL expanded = [currentCell expanded];
    if(expanded) 
    {
        [currentCell setExpanded:NO];
        previousIndexPath_ = nil;
    }

    else
    {
        [currentCell setExpanded:YES];
        previousIndexPath_ = [indexPath copy];
    }

    // moving this line to inside the if statement blocks above instead of outside the loop works, but why?
    [indicesToReload addObject:[indexPath copy]];


}

// commenting out this line makes the animations work, but the table view background is visible between the cells

[tableView reloadRowsAtIndexPaths:indicesToReload withRowAnimation:UITableViewRowAnimationAutomatic];

// using reloadData completely ruins the animations
[tableView beginUpdates];

 [tableView endUpdates];
}