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    <p>I agree with Talha's comment for this and would not recommend using Notification Center. It would be best to create a new class that inherits from NSObject to handle the socket events, but you can also make it work using only the app delegate if you need to. To make it easy for you...</p> <p>Create a link from socket class to the view controller</p> <p>Define TableViewSocketEventsDelegate somewhere that both files can see. You can create a public Constants.h or something.</p> <pre><code>@protocol TableViewSocketEventsDelegate &lt;NSObject&gt; @required - (void) someSocketEvent:(int)statusCode; //TODO: Add callbacks that make sense here @end </code></pre> <p>Give the socket class (in your case the app delegate .h file) a reference to something that will ultimately handle the action (in your case the table view controller)</p> <pre><code>@property (nonatomic, assign) id&lt;TableViewSocketEventsDelegate&gt; socketDelegate; </code></pre> <p>And in the .m be sure to synthesize the socketDelegate and assign it to the appropriate view controller. </p> <p>Next tell the view controller that it can handle these delegate call backs.</p> <p>in .h:</p> <pre><code>ViewController : UITableViewController&lt;TableViewSocketEventsDelegate&gt; </code></pre> <p>in .m:</p> <pre><code>#pragma mark - TableViewSocketEventsDelegate - (void) someSocketEvent:(int)statusCode { NSLog(@"Some socket event happened %I", statusCode); } </code></pre> <p>Now all you have to do is alter your existing methods in the app delegate that deal with sockets to call the new methods</p> <pre><code>if (self.socketDelegate) { [self.socketDelegate someSocketEvent:2]; } </code></pre> <p>Does that make sens to you? I would also recommend making a base class for all of your tab view controllers if they all need to deal with this same delegate.</p> <p>Good luck!</p>
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    1. COThank you for you answer! When you say: "Create a link from socket class to the view controller" it's a problem because I have many view controllers and each of them shows different view that needs to request something from server. How can I make this socket class return answer to whom ever made the request?
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    2. COIt seems that your problem is that you don't have a reference to your different view controllers used by your tab controller. To accomplish this you must create a property in your app delegate to hold the reference to each view controller. Inside your didFinishLaunchingWithOptions method in the app delegate you are able to find the root view controller and save a reference to it... UITabViewController tabVc = self.window.rootViewController. From this tab controller you can find each child vc by the index and save an instance of whichever ones you need.
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    3. COYeah, that true I don't keep references to ViewControllers. I think I read somewhere that each ViewController is opened and when not needed is destroyed and it's not a good practice to keep references to them because the concept of ViewController is to be created when needed and destroyed when finished. Would you agree to this?? But your approach of keeping references to the VIewControllers will probably solve my issue! Thanks!!
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