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POWait until multiple networking requests have all executed - including their completion blocks
 

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    <p>I have multiple operations (they're AFNetworking requests) with completion blocks that takes some time to execute, and a Core Data object that needs to be saved at the end of all the requests.</p> <pre><code>MyCoreDataObject *coreDataObject; AFHTTPRequestOperation *operation1 = [[AFHTTPRequestOperation alloc] initWithRequest:request1]; [operation1 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { coreDataObject.attribute1 = responseObject; sleep(5); }]; [operation1 start]; AFHTTPRequestOperation *operation2 = [[AFHTTPRequestOperation alloc] initWithRequest:request1]; [operation2 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { coreDataObject.attribute2 = responseObject; sleep(10); }]; [operation1 operation2]; [context save:nil]; </code></pre> <p>Of course, this does not work as I want because the requests are asynchronous. I tried adding an NSOperationQueue like so:</p> <pre><code>NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init]; [operationQueue setMaxConcurrentOperationCount:2]; AFHTTPRequestOperation *operation1 = [[AFHTTPRequestOperation alloc] initWithRequest:request1]; [operation1 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { coreDataObject.attribute1 = responseObject; sleep(5); }]; [operationQueue addOperation:operation1]; AFHTTPRequestOperation *operation2 = [[AFHTTPRequestOperation alloc] initWithRequest:request1]; [operation2 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { coreDataObject.attribute2 = responseObject; sleep(10); }]; [operationQueue addOperation:operation2]; [imageQueue waitUntilAllOperationsAreFinished]; [context save:nil]; </code></pre> <p>This looks a bit better. Using <code>waitUntilAllOperationsAreFinished</code>, my queue blocks the current thread until my requests are finished, but not until my success Blocks are finished, which is really what I need.</p> <p>Any ideas on how to achieve this in a good way?</p>
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