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Which tasks would be better suited to using NSOperation as opposed to using GCD when programming for the iPhone?
To me they seem to do the same thing. I can’t see the strengths and weaknesses one has over the other.
NSOperationis built on top of GCD, so the question is more about whether you useNSOperationor pass a block directly to GCD.An
NSOperationis bulky and needs more boiler-plate codes to set it up, but it has a lot more functionality. You can create the sameNSOperationsubclass in various parts of your code and put them into the queue and run it.Passing a block to GCD by e.g.
dispatch_asyncis quick and disposable. You typically don’t reuse a block anywhere else; you just set up a block which is executed only at that point of the code, passes it to the GCD or other APIs, and quickly go on.So each has its merits.