Subclassed control in IB uses original cell class

FROM : David Hoerl
DATE : Wed Nov 28 21:48:03 2007

I found a neat double knobbed slider on the web:
http://developer.snowmintcs.com/controls/smdoubleslider/

There is only a IB2 palette, so I figured I'd just add a NSSlider
object to my NIB, change its class to SMDoubleClass, then do anything
further in awakeFromNib.

The problem is that the control ends up with a NSSliderCell and not a
SMDoubleSliderCell - guess +cellClass does not get invoked for
archived objects.

At first, I could not subclass the cell as a nib2.x file does not
support it. However, the IB3 docs say I can use the nib3.x file on
Tiger (for building only, not editing). So, I changed formats,
changed the cell class, and now all is working as expected.

I was wondering though - suppose I had to stay with IB2 - how would I
get the correct class of cell?

David