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    <p>AFNetworking is awesome. Uses blocks and GCD. I have written a NetworkClient class that makes calling it fairly simple. Feel free to use it or customize it, but I don't warranty anything :)</p> <p>The API Key is something that can be removed if this doesn't fit your needs. I added it as a way to add security to all my network requests. My web services check the validity of the passed in APIKey before returning anything.</p> <p>Also, you can be fairly flexible in how you want things done. You could do sync or async requests, requests that don't warn the user on failure, etc.</p> <p>Basic Example usage:</p> <pre><code>NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys: @"GetAllParkingLots", @"Command", nil]; [NetworkClient processURLRequestWithURL:nil andParams:params block:^(id obj) { // I check to see what kind of object is passed back, in this case I was expecting an Array if ([obj isKindOfClass:[NSArray class]]) { // Do something with the Array [self processNetworkRequestWithArray:(NSArray *)obj]; } }]; </code></pre> <p>NetworkClient.h:</p> <pre><code>// // NetworkClient.h // // Created by LJ Wilson on 2/18/12. // Copyright (c) 2012 LJ Wilson All rights reserved. // #import &lt;Foundation/Foundation.h&gt; extern NSString * const APIKey; @interface NetworkClient : NSObject +(void)processURLRequestWithURL:(NSString *)url andParams:(NSDictionary *)params block:(void (^)(id obj))block; +(void)processURLRequestWithURL:(NSString *)url andParams:(NSDictionary *)params syncRequest:(BOOL)syncRequest block:(void (^)(id obj))block; +(void)processURLRequestWithURL:(NSString *)url andParams:(NSDictionary *)params syncRequest:(BOOL)syncRequest alertUserOnFailure:(BOOL)alertUserOnFailure block:(void (^)(id obj))block; +(void)handleNetworkErrorWithError:(NSError *)error; +(void)handleNoAccessWithReason:(NSString *)reason; @end </code></pre> <p>NetworkClient.m:</p> <pre><code>// // NetworkClient.m // // Created by LJ Wilson on 2/18/12. // Copyright (c) 2012 LJ Wilson All rights reserved. // #import "NetworkClient.h" #import "AFHTTPClient.h" #import "AFHTTPRequestOperation.h" #import "SBJson.h" #warning Set APIKey or set to nil NSString * const APIKey = @"YourAPIKEYGoesHere"; @implementation NetworkClient +(void)processURLRequestWithURL:(NSString *)url andParams:(NSDictionary *)params block:(void (^)(id obj))block { [self processURLRequestWithURL:url andParams:params syncRequest:NO alertUserOnFailure:NO block:^(id obj) { block(obj); }]; } +(void)processURLRequestWithURL:(NSString *)url andParams:(NSDictionary *)params syncRequest:(BOOL)syncRequest block:(void (^)(id obj))block { [self processURLRequestWithURL:url andParams:params syncRequest:syncRequest alertUserOnFailure:NO block:^(id obj) { block(obj); }]; } +(void)processURLRequestWithURL:(NSString *)url andParams:(NSDictionary *)params syncRequest:(BOOL)syncRequest alertUserOnFailure:(BOOL)alertUserOnFailure block:(void (^)(id obj))block { #warning Fix default url // Default url goes here, pass in a nil to use it if (url == nil) { url = @"YourDefaultURLGoesHere"; } NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithDictionary:params]; [dict setValue:APIKey forKey:@"APIKey"]; NSDictionary *newParams = [[NSDictionary alloc] initWithDictionary:dict]; NSURL *requestURL; AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:requestURL]; NSMutableURLRequest *theRequest = [httpClient requestWithMethod:@"POST" path:url parameters:newParams]; __block NSString *responseString = @""; AFHTTPRequestOperation *_operation = [[AFHTTPRequestOperation alloc] initWithRequest:theRequest]; __weak AFHTTPRequestOperation *operation = _operation; [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { responseString = [operation responseString]; id retObj = [responseString JSONValue]; // Check for invalid response (No Access) if ([retObj isKindOfClass:[NSDictionary class]]) { if ([[(NSDictionary *)retObj valueForKey:@"Message"] isEqualToString:@"No Access"]) { block(nil); [self handleNoAccessWithReason:[(NSDictionary *)retObj valueForKey:@"Reason"]]; } } else if ([retObj isKindOfClass:[NSArray class]]) { if ([(NSArray *)retObj count] &gt; 0) { NSDictionary *dict = [(NSArray *)retObj objectAtIndex:0]; if ([[dict valueForKey:@"Message"] isEqualToString:@"No Access"]) { block(nil); [self handleNoAccessWithReason:[(NSDictionary *)retObj valueForKey:@"Reason"]]; } } } block(retObj); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"Failed with error = %@", [NSString stringWithFormat:@"[Error]:%@",error]); block(nil); if (alertUserOnFailure) { // Let the user know something went wrong [self handleNetworkErrorWithError:operation.error]; } }]; [operation start]; if (syncRequest) { // Process the request syncronously [operation waitUntilFinished]; } } +(void)handleNetworkErrorWithError:(NSError *)error { NSString *errorString = [NSString stringWithFormat:@"[Error]:%@",error]; // Standard UIAlert Syntax UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:@"Connection Error" message:errorString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; [myAlert show]; } +(void)handleNoAccessWithReason:(NSString *)reason { // Standard UIAlert Syntax UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:@"No Access" message:reason delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; [myAlert show]; } @end </code></pre>
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    1. PONetworking using a separate thread on iOS
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    1. COThanks for your elaborate answer. However, AFNetworking is not what I am looking for as I do not connect with a web server. I have used AFNetworking in past projects and it does indeed work great. For this application (as mentioned in the question), I communicate between and iOS client and an OS X server making use of Bonjour and low level socket APIs.
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