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POPerform block inside a NSOperation
 

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    <p>I have a method in some class which performs some task using a block. When I execute that method using NSInvocationOperation then control never goes to the block. I tried logging inside the block but that is never called actually. But if I simply call that method with instance of that class then everything works as expected.</p> <p>Don’t blocks run inside NSOperation?</p> <pre><code>NSInvocationOperation *op = [[NSInvocationOperation alloc] initWithTarget:myClassObj selector:@selector(myClassMethod:) object:obj1]; [[AppDelegate sharedOpQueue] addOperation:op]; [op release]; - (void)myClassMethod:(id)obj { AnotherClass *otherClass = [[AnotherClass allco] init] [otherClass fetchXMLWithCompletionHandler:^(WACloudURLRequest* request, xmlDocPtr doc, NSError* error) { if(error){ if([_delegate respondsToSelector:@selector(handleFail:)]){ [_delegate handleFail:error]; } return; } if([_delegate respondsToSelector:@selector(doSomeAction)]){ [_delegate doSomeAction]; } }]; } - (void) fetchXMLWithCompletionHandler:(WAFetchXMLHandler)block { _xmlBlock = [block copy]; [NSURLConnection connectionWithRequest:request delegate:self]; } -(void)connectionDidFinishLoading:(NSURLConnection *)connection { if(_xmlBlock) { const char *baseURL = NULL; const char *encoding = NULL; xmlDocPtr doc = xmlReadMemory([_data bytes], (int)[_data length], baseURL, encoding, (XML_PARSE_NOCDATA | XML_PARSE_NOBLANKS)); NSError* error = [WAXMLHelper checkForError:doc]; if(error){ _xmlBlock(self, nil, error); } else { _xmlBlock(self, doc, nil); } xmlFreeDoc(doc); } } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { if(_xmlBlock) { _xmlBlock(self, nil, error); } } </code></pre>
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    1. USJitendra Singh
    1. USJitendra Singh
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    1. COIs the `-parseXMLWithCompletionHandler:` method on AnotherClass asynchronous? You might want to post the code for that method, as it looks like whatever it does for the callback isn't calling, and that's not described in your above code.
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      1. POPerform block inside a NSOperation
      1. USBrad Larson
    2. CO@BradLarson thanks for response, I have edited question with the details of the method -parseXMLWithCompletionHandler:
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      1. POPerform block inside a NSOperation
      1. USJitendra Singh
    3. COYour code calls `parseXMLWithCompletionHandler:` but shows the implementation for `fetchXMLWithCompletionHandler:`.
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      1. POPerform block inside a NSOperation
      1. UStitaniumdecoy
 

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