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    <p>You have 2 options:</p> <ol> <li>Implement a delegate protocol</li> <li>Use NSNotifications</li> </ol> <p>The advantages/disadvantages of each is set out well in this question and answer: <a href="https://stackoverflow.com/questions/2232694/delegates-vs-notifications-in-iphoneos">Delegates v Notifications</a></p> <p>As notifications are easier to implement and may well be sufficient for your needs, you can implement it with the following steps:</p> <ol> <li>In the class where you download the data: When the data has been downloaded and the array populated, include the following lines:</li> </ol> <p><code>NSDictionary *dict = [NSDictionary dictionaryWithObject:array forKey:@"Data"]; [[NSNotificationCenter defaultCenter] postNotificationName:@"DataDownloaded" object:self userInfo:dict];</code></p> <ol start="2"> <li>In the class where you want to receive the data:</li> </ol> <p>2.1 Add the following line to your viewDidLoad method:</p> <pre><code>`[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(dataDownloaded:) name:@"DataDownloaded" object:nil]; </code></pre> <p>2.2 Create the dataDownloaded selector:</p> <ul> <li><p>(void)dataDownloaded:(NSNotification *)note {</p> <p><code>NSDictionary *dict = note.userInfo; NSArray *dataArray = [note.userInfo objectForKey:@"DataDownloaded"];</code></p></li> </ul> <p>2.3 Add the following line to dealloc and viewDidUnload:</p> <pre><code>[[[NSNotificationCenter defaultCenter] removeObserver:self]; </code></pre>
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    1. COi dont think this really answers the question though, the OP has not indicated that he has a problem knowing when data is available, but how to access it from elsewhere in his app. Personally i find notifications a bit coarse grained but tend to fit will with non-functional parts of an app, e.g. Reachability. some better code design would probably see the data encapsulated in a dedicated class available through a factory interface (maintaining testability) as a pseudo singleton.
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