Question

Happy 14th Baktun everybody!

This thing has been bugging me for a while, and I’ve googled to and fro, and also checked SO for an answer, but I just can’t seem to grasp the answers and apply it to my app. If some of you would be so kind to help out, that would be appreciated!

I got the following function that deletes a cell from an UITableView when a stepper reaches 0.
I want the cell to be animated to the left, so when you press the – sign you’ll see the cell swipe out of view. I set the sender.tag to the [[cell stepper]setTag:indexPath.row]; in CellForRowAtIndexPath.

  - (void)stepperChanged:(UIStepper *)sender
{

    WinkelWagen *ww = [WinkelWagen sharedWinkelWagen];
    BWBand *band = [ww.winkelWagenArray objectAtIndex: sender.tag];
    NSDecimalNumber *nummer = [[NSDecimalNumber alloc]initWithFloat:sender.value];
    band.winkelmandjeAantal = nummer;
    [sender setValue:[band.winkelmandjeAantal doubleValue]];

    // Remove the cell and object from WinkelWagen if stepper.value turns 0
    if (sender.value == 0)
    {
        NSArray *deleteIndexPaths = [NSArray arrayWithObjects:
                                     [NSIndexPath indexPathForRow:sender.tag inSection:0],
                                     nil];
        [ww.winkelWagenArray removeObject:band];
        [self.tableView beginUpdates];
        [self.tableView reloadData];
        [self.tableView deleteRowsAtIndexPaths:deleteIndexPaths withRowAnimation:UITableViewRowAnimationNone];

        if ([winkelmandjeData count] == 0)
        {
            NSArray *addIndexPaths = [NSArray arrayWithObjects:
                                      [NSIndexPath indexPathForRow:0 inSection:0],
                                      nil];
            [self.tableView insertRowsAtIndexPaths:addIndexPaths withRowAnimation:UITableViewRowAnimationFade];
        }
        [self.tableView endUpdates];
    }
}

UPDATE:
I’ve worked it out with [[self.tableview]reloaddata] but then the animation doesn’t play. Can someone tell me how I should handle the data and the animation properly?

Thanks!

Answer 1

I see there something you could have a problem with, but don’t know if it is an answer to your question. In your if ([shoppingCartData count] == 0) you are adding a row to the table, but the data source remains the same. That could result in a crash.

Also, before the if, your data source seem to be ww.shoppingCartArray, but in the if you are checking the count of shoppingCartData.

Hope this helps!