Have you tried [[theTable headerView] setNeedsDisplay:YES];?

That seems like the obvious solution, but the poster in that thread claims, 
incorrectly, that the table header isn't a view. Yes it is.

--Graham


On 27/01/2011, at 3:05 AM, Eric Gorr wrote:

> I found this old thread:
> 
>   refreshing the header title for an NSTableColumn
>   http://lists.apple.com/archives/cocoa-dev/2005/Nov/msg00659.html
> 
> which describes the same problem I just faced.
> 
> In my case, I needed to change the justification of the text in the header 
> cell and calling setNeedsDisplay: on the table did not cause the header cell 
> to redraw itself. My only option still appears to be telling the table to 
> reload it's data. Of course, this could result in an unnecessary performance 
> hit depending on how much work needs to be done when reloading the data.
> 
> It is possible that -reloadDataForRowIndexes:columnIndexes: would cause the 
> header cell to redraw if I just tell the first row and the column that 
> changed to reload it's data, but I need to stay with the 10.5 SDK for the 
> moment.
> 
> I was only curious if there was some other better and more efficient method 
> that I could use to get the header cell to redraw since this old thread from 
> 2005. 
> 
> If there isn't, I'll file an enhancement request....it still would seem silly 
> to need to call any reloadData method to get a header cell to redraw in this 
> situation.

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