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10.8 copiesOnScroll, -setNeedsDisplayInRect: ignored during scrolling
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10.8 copiesOnScroll, -setNeedsDisplayInRect: ignored during scrolling


  • Subject: 10.8 copiesOnScroll, -setNeedsDisplayInRect: ignored during scrolling
  • From: Dave Keck <email@hidden>
  • Date: Sat, 04 Aug 2012 11:35:40 -1000

I'm working on a scrollable grid view and noticed that its appearance
during scrolling has regressed since installing 10.8.

This grid view loads content in the background and calls
-setNeedsDisplayInRect: (thread-safely) as content becomes available.

With copy-on-scroll enabled, -setNeedsDisplayInRect: seems to be
ignored until scrolling stops, at which point the content snaps in.
With copy-on-scroll disabled, the view displays normally, but is less
performant than the copy-on-scroll version running on 10.7.

Is there a way to have these setNeedsDisplayInRect: calls respected
during scrolling?

Thanks for any guidance!
David
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