StackOverflow2013

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Id
12859252
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2012-10-12T12:37:59.393
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2012-10-12T12:50:28.490
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2017-05-23T12:30:17.033
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2
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text
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<a href="http://eschatologist.net/blog/?p=232" rel="nofollow noreferrer">Common</a> <a href="https://stackoverflow.com/questions/10373331/nsoperation-vs-grand-central-dispatch">advice</a> is to use the highest level of abstraction available to you to perform a task. As such <code>NSThread</code> should be relatively low down in the list of things you can do to execute work in the background. The order you investigate APIs should be like this: <ol> <li><a href="https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/NSOperation_class/Reference/Reference.html#//apple_ref/doc/uid/TP40004591" rel="nofollow noreferrer">NSOperation</a> / <a href="https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/NSOperationQueue_class/Reference/Reference.html" rel="nofollow noreferrer">NSOperationQueue</a></li> <li><a href="http://developer.apple.com/library/ios/#documentation/Performance/Reference/GCD_libdispatch_Ref/Reference/reference.html" rel="nofollow noreferrer">Grand Central Dispatch</a> (libdispatch)</li> <li>NSThread</li> <li>POSIX threads</li> </ol> With the first two you write your code as a "unit of work" and then put this work on a queue to be executed at some point. The system takes care of creating and destroying threads for you and the APIs are easy to work with. Here's an example using <code>NSOperationQueue</code>. <pre><code>NSBlockOperation * blockOperation = [NSBlockOperation blockOperationWithBlock:^{ //Do work //update your UI on the main thread. [self performSelectorOnMainThread:@selector(workDone:) withObject:workResults waitUntilDone:NO]; }]; [self.operationQueue addOperation:blockOperation]; </code></pre> easy as that.
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1. POiOS: How to do hard work with data in background thread?
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1. USCommunity
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1. USjackslash
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