Question

I’ve read a few SO posts regarding this issue, but seem to be having issues (hair pulling included of course) adding an additional cell to the top of a UITableView. Here is my code:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // self.StringArray has 5 string objects inside
    return ([self.stringArray count] + 1);
}

- (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];
    }

    // create hardcoded first row in table
    if([indexPath row] == 0)
    {
        cell.textLabel.text = @"Select me";
    }
    else
    {
        // decrement the row to get the correct object from the self.stringArray
        int arrayIndex = [indexPath row] - 1;
        cell.textLabel.text = [self.stringArray objectAtIndex:arrayIndex];
    }
    return cell;
}

Everything looks good (obviously something is wrong though if I’m getting exception error), but I can’t seem to eyeball it.

Exception: * Terminating app due to uncaught exception ‘NSRangeException’, reason: ‘* -[__NSArrayM objectAtIndex:]: index 5 beyond bounds [0 .. 4]’

Answer 1

I found the problem. I overlooked the fact that I didn’t account for the other UITableView delegate methods, and I didn’t account for this extra row in the UITableView when setting up the logic for the tableView:canEditRowAtIndexPath method. Here is the code that fixed the problem:

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // I added code here to intercept the added row (row 0) and make it non-editable
    if([indexPath row] == 0)
    {
        return NO;
    }
    else
    {
        // decrement the row to get the correct object from the self.stringArray    
        int arrayIndex = [indexPath row] - 1;
        if([[self.stringArray objectAtIndex:arrayIndex] length] > 10)
        {
            return YES;
        }
        else
        {
            return NO;
        }
    }
}