I have overridden the tableView:indentationLevelForRowAtIndexPath method in my UITableViewController derived class as follows:

- (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSDictionary* item = [self.projects objectAtIndex:indexPath.row];
    int indentationLevel = [[item objectForKey:@"indent"] intValue];
    DLog (@"Indentation Level for Row %d : %d", indexPath.row, indentationLevel);
    return indentationLevel;
}

I initially thought that this was not being called but that was operator error (err, mine) and I hadn't defined the symbol DEBUG=1.

However, it is being called (duh me!) and this is the log output:

 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 0 : 1
 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 1 : 1
 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 2 : 2
 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 3 : 2
 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 4 : 2
 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 5 : 1
 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 6 : 2
 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 7 : 2
 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 8 : 1

But, this is not affecting the layout of the cells. No indentation.

This is my itemCellForRowAtIndexPath implementation, if that makes any difference:

-(UITableViewCell*)tableView:(UITableView *)tableView itemCellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString* cellIdentifier = @"projectItemCell";
    ProjectItemTableViewCell* cell = (ProjectItemTableViewCell*)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell == nil) {
        NSArray* nib = [[NSBundle mainBundle] loadNibNamed:@"ProjectItemTableViewCell" owner:self options:nil];
        for (id oneObject in nib) {
            if ([oneObject isKindOfClass:[ProjectItemTableViewCell class]]) {
                cell = (ProjectItemTableViewCell*)oneObject;
            }
        }
    }

    NSDictionary* item = [self.projects objectAtIndex:indexPath.row];
    cell.projectDescLabel.text = [item objectForKey:@"name"];
    cell.itemCountlabel.text = [NSString stringWithFormat:@"%d", [[item objectForKey:@"cache_count"] intValue]];
    cell.itemCountlabel.backgroundColor = [UIColor colorForHex:[item objectForKey:@"color"]];
    cell.indentationWidth = 20;
    return cell;
}

How do I indent a custom UITableViewCell which I have defined in Interface Builder?

If I change the itemCellForRowAtIndexPath to use a default UITableViewCell with the code below, then it indents fine.

static NSString* cellIdentifier = @"projectItemCell";
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease];
}

NSDictionary* item = [self.projects objectAtIndex:indexPath.row];
cell.textLabel.text = [item objectForKey:@"name"];
cell.indentationWidth = 40;

return cell;