Question

in my table view class using following methods and I am trying to delete a row of the table view

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [arrUserData count];
}

- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
    [super setEditing:editing animated:animated];
    [self.tableView setEditing:editing animated:YES];   
}

- (void)tableView:(UITableView *)tv commitEditingStyle (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath 
{
    if(editingStyle == UITableViewCellEditingStyleDelete) 
    {
        [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
        [arrUserData removeObjectAtIndex:indexPath.row];
    }
}

and i have some 40 rows in the table, when i click on the red delete button on any of the rows its crashing at this line

[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];

with the following crash log

2012-05-30 14:58:45.835 testDeleteRow[3276:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0.  The number of rows contained in an existing section after the update (41) must be equal to the number of rows contained in that section before the update (41), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted).'

can anyone tell me how can i fix this,,thanx in advance

Answer 1

Actually you need to update your data source when you are deleting cells. If you are using an array for populating table then after this line –

[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];

you need to remove object at the same index from array. Also numbers of rows in section should be decrease by 1. if you are returning array count there then it will be automatically handle.