Comments on: When to use NSOperation vs. GCD

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By: Chris Mear

Chris Mear — Wed, 09 Sep 2009 19:01:41 +0000

Brilliant, thanks for the response!

By: James Bucanek

James Bucanek — Wed, 09 Sep 2009 16:26:21 +0000

Chris,

Yes. In 10.6 NSOperation uses Grand Central Dispatch to do it's work. So if you've already written, or continue to write, NSOperation methods you'll benefit from GCD automatically on Snow Leopard while retaining backwards compatibility with Leopard.

By: Pierre Bernard

Pierre Bernard — Wed, 09 Sep 2009 14:59:39 +0000

I would love to see an example of somebody tying in NSOperationQueue with a table view to produce a representation of a list of concurrent and individually cancelable tasks. Much like the copy/move progress window in the Finder.

By: Chris Mear

Chris Mear — Wed, 09 Sep 2009 09:18:00 +0000

Newbie question: Does this mean that one could write the same code to target 10.5 and 10.6, using NSOperation, and get the benefit of GCD backing on 10.6 while still retaining source-level compatibility with 10.5?

By: Colin Barrett

Colin Barrett — Wed, 09 Sep 2009 04:31:07 +0000

I actually feel the opposite. NSOperation's heavy reliance on KVO makes it a real pain to use. I would rather re-imement something like cancelling or chaining myself than deal with KVO's ugly API.

A bit extreme, sure. But fighting that particular fight is just a real drag.