StackOverflow2013

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2012-04-19T17:29:04.380
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2012-04-19T17:48:35.167
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If you don't need to inform multiple objects upon completion of the task, you could add a completion handler (objc block) to the <code>-fetchActiveUser:withPassword:</code> method (so it would become something like <code>-fetchActiveUser:withPassword:completionHandler:</code> and add the code to be executed in the completion handler. An example, lets say your <code>-fetchActiveUser:withPassword:completionHandler:</code> method looks like the following: <pre><code>- (void)fetchActiveUser:(NSString *)user withPassword:(NSString *)pass completionHandler:(void (^)(TLUser *user, NSError *error))handler { NSURL *URL = [NSURL URLWithString:@"http://www.website.com/page.html"]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL]; NSOperationQueue *queue = [NSOperationQueue currentQueue]; [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^ (NSURLResponse *response, NSData *data, NSError *error) { if (!handler) { return }; if (data) { TLUser *user = [TLUser userWithData:data]; if (user) { handler(user, nil); } else { NSError *error = // 'failed to create user' error ... handler(nil, error); } } else { handler(nil, error); } }]; } </code></pre> The completion handler will be called whenever the task is finished. It will either return a TLUser object or an Error if something went wrong (bad connection, data format changed while parsing, etc...). You'll be able to call the method like this: <pre><code>- (void)saveConfiguration:(id)sender { TLHTTPClient *RESTClient = [TLHTTPClient sharedClient]; // Performs the asynchronous fetching [RESTClient fetchActiveUser:[usernameTextField stringValue] withPassword:[passwordTextField stringValue] completionHandler:^ (TLUser *user, NSError *error) { if (user) { NSLog(@"%@", user); } else { NSLog(@"%@", error); } }]; } </code></pre> Of course, in this example I've used the build in asynchronous methods of NSURLConnection in stead of AFNetworking, but you should be able to get the general idea. 
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1. PONSNotificationCenter - Way to wait for a notification to be posted without blocking main thread?
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1. USWolfgang Schreurs
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