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copied!<p>Here is how I generally do it. I, too, have a singleton object used for making network requests. For requests that have to be made often, I have an NSOperationQueue that accepts AFHTTPRequestOperations (or AFJSONRequestOperations) since I generally use AFNetworking for making requests. For these, there is a completionBlock and failureBlock property that is executed upon success or failure of the request. On my singleton object, I would have a method for initiating a particular network request, and as parameters to that method, I would include a success and failure block which can be passed into the blocks defined in the method. This way, the entire application can make a network request, and the scope of the application at that point is available to the singleton in the block that is passed to the method. For example...(using ARC)</p> <pre><code> @implementation NetworkManager -(void)makeRequestWithSuccess:(void(^)(void))successBlock failure:(void(^)(NSError *error))failureBlock { NSURL *url = [NSURL URLWithString:@"some URL"]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request]; [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { [responseObject doSomething]; if (successBlock) dispatch_async(dispatch_get_main_queue(), successBlock); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { if (failureBlock) dispatch_async(dispatch_get_main_queue(), ^{ failureBlock(error); }); }]; [self.operationQueue addOperation:op]; } @end </code></pre> <p>And you can always make the success block take whatever parameters you need to pass around. </p>

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