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Subclassed control in IB uses original cell class

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Subclassed control in IB uses original cell class

Subject: Subclassed control in IB uses original cell class
From: David Hoerl <email@hidden>
Date: Wed, 28 Nov 2007 15:48:03 -0500

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
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