Multiple cells that don't exist on NSTableView

I have a NSTableView with 3 cells. I have adjusted that table view to show the separators, by using this code:

  [self.tableView setGridColor:[NSColor lightGrayColor]];
  [self.tableView setIntercellSpacing:NSMakeSize(1, 1)];
  [self.tableView setGridStyleMask:NSTableViewDashedHorizontalGridLineMask];

When I render the table I see this:

enter image description here

The table shows a number of cells that are not supposed to exist and with a different size!

Is this normal? How do I get rid of those "phantom cells"?

Solution

If all the content rows in your table are the same size, you can use the NSTableView size inspector to specify the size. If you do this, the system-added 'padding' rows will have this size also.

enter image description here

To get rid of the grid lines associated with the system-added rows, the snippet below worked for me in a very quick demo app (this snippet is not my own, it was taken from an answer to another Stackoverflow question)

// MyNSTableView.m (only need to override this one NSTableView method)

- (void)drawGridInClipRect:(NSRect)clipRect
{
    NSRect lastRowRect = [self rectOfRow:[self numberOfRows]-1];
    NSRect myClipRect = NSMakeRect(0, 0, lastRowRect.size.width, NSMaxY(lastRowRect));
    NSRect finalClipRect = NSIntersectionRect(clipRect, myClipRect);
    [super drawGridInClipRect:finalClipRect];
}

Combining the two gives the following effect (I'm using alternating row colors to show that the gird lines are indeed not drawn for the system-added padding rows).

enter image description here