Question

I have a UITableView whose datasource is a NSMutableArray. The array consists of a set of objects. All the cells are displayed in proper order.

Now I want to know how to display a last cell always with some text alone which is not there in the datasource array.

I hope i am clear enough 🙂

EDIT :———-

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
     // Return the number of rows in the section.
     //+1 to add the last extra row
     return [appDelegate.list count]+1;
}

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

NSUInteger index=[indexPath row];

 if(index ==([appDelegate.list count]+1)) {
    cell.textLabel.text = [NSString stringWithFormat:@"extra cell"];    
    }else{
    Item *i = (Item *) [appDelegate.list objectAtIndex:indexPath.row];
    cell.textLabel.text = [NSString stringWithFormat:@"%@ (%d %@)",i.iName, i.iQty,i.iUnit];
    }
cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
return cell;
}

but i get the NSMutableArray out of bounds exception.

What could be wrong ?

Answer 1

Your problem is the value you are checking against index. The list has count objects indexed 0 to count – 1. So you must check against count and not count + 1. As it is now, the request for countth row is entering the else section. There is no object at count in the list array. So you are getting the error. This is the modification.

if(index == [appDelegate.list count] ) {
    cell.textLabel.text = [NSString stringWithFormat:@"extra cell"];    
}else{
    Item *i = (Item *) [appDelegate.list objectAtIndex:indexPath.row];
    cell.textLabel.text = [NSString stringWithFormat:@"%@ (%d %@)",i.iName, i.iQty,i.iUnit];
}