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copied!<p>AFNetworking is a great choice! I'd advise to use blocks, keeping the login request & result handling together. It would also simplify and shorten the code.</p> <p>Then, like the AFNetworking's <a href="https://github.com/AFNetworking/AFNetworking/wiki/Getting-Started-with-AFNetworking" rel="nofollow">Getting Started</a> at the end suggests, it's a good idea to subclass <code>AFHTTPCLIENT</code>.</p> <p>General remark: As the marvellous <a href="http://www.amazon.de/Objective-C-Phrasebook-Developers-Library-Chisnall/dp/0321813758/ref=sr_1_3?ie=UTF8&qid=1357947485&sr=8-3" rel="nofollow">Objective-C Phrasebook</a> suggests, a singleton can be created without GCD using the language's <code>+initialize</code>. And the shared variable generally is a static, instead of an instance variable.</p> <p>The first part would look like:</p> <pre><code>@class SLWebService; @interface SLWebService : AFHTTPClient + (SlWebService)sharedWebService; - (void)login:(NSString*)email password:(NSString*)password success:(void (^)(AFHTTPRequestOperation* operation, NSDictionary* response))success failure:(void (^)(AFHTTPRequestOperation* operation, NSError* error))failure; @end #import "SLWebService.h" @implementation SLWebService static SLWebService* sharedWebService; + (void)initialize { if ([SLWebService class] == self) { sharedWebService = [[self alloc] initWithBaseURL:[NSURL URLWithString:@"http://www.domain.de/"]]; // Let AFNetworking do conversion to/from JSON. [sharedWebService setParameterEncoding:AFJSONParameterEncoding]; [sharedWebService setDefaultHeader:@"Accept" value:@"application/json"]; [sharedWebService registerHTTPOperationClass:[AFJSONRequestOperation class]]; } } + (id)allocWithZone:(NSZone*)zone { if (sharedWebService && [SLWebService class] == self) { [NSException raise:NSGenericException format:@"Duplicate SLWebService singleton creation"]; } return [super allocWithZone:zone]; } + (SLWebService*)sharedWebService { return sharedWebService; } ... </code></pre> <p>As a final off-topic remark: I don't like Apple's/Xcode's suggestion to use <code>-initWithNibName::</code> for view controllers, because this keeps the XIB name outside the class. You almost never need to initialise with a different XIB, therefore I'd rather specify the XIB inside '-init'. Like so:</p> <pre><code>- (id)init { if (self = [super initWithNibName:@"SLLoginView" bundle:nil]) { } return self; } </code></pre> <p>Cheers, hope this helps!</p>

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