On May 28, 2013, at 10:12 AM, Dave Fernandes <dave.fernan...@utoronto.ca> wrote:

> I use the GCD serial queue approach. On each update from the slider, cancel 
> all operations in the queue and then add a new operation with the latest 
> slider value. However, the NSOperation subclass should NOT check whether it 
> is cancelled once it starts executing. That way, once it starts, it is 
> assured to complete and you will get periodic updates.

So which are you using, NSOperationQueue or GCD?

--Kyle Sluder

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