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copied!<p>There are a lot of topics to cover here, but I'll start with the recommended approach:</p> <p>METHOD_003</p> <pre><code>-(void)viewDidLoad { NSLog(@"VIEW: Single ... Loaded"); self.pickerData = [NSArray arrayWithObjects:@"A", @"B", @"C", nil]; [super viewDidLoad]; } </code></pre> <p>Note: thanks to Vladimir for the <a href="https://stackoverflow.com/posts/2245727/edit">reminder to nil-terminate</a>.</p> <p>Now, for the details:</p> <p>METHOD_001 does the exact same thing as METHOD_003, but it takes a few more lines of code.</p> <p>METHOD_002 has a memory leak because you <code>alloc</code> the array, and then also <code>retain</code> it. This results a total retain count of 2. When you release the array in your <code>dealloc</code> method, the count will be reduced to 1, so the array will not be released from memory.</p> <p>Even if you remove the extra <code>retain</code> from METHOD_002, it will not do two very important things:</p> <ol> <li><p>It will not send the proper <a href="http://developer.apple.com/mac/library/documentation/cocoa/conceptual/KeyValueCoding/KeyValueCoding.html" rel="nofollow noreferrer">KVC/KVO notifications</a>. Cocoa does a lot of very convenient things behind-the-scenes when you use a property accessor, so unless you have a good reason not to, using the accessors is highly recommended.</p></li> <li><p>It will not automatically release any old data that was stored in <code>pickerData</code>. This is not a concern in <code>viewDidLoad</code>, but if you were in a different method, it <em>would</em> make a difference, so it is best to just get in the habit of using the accessors unless you have a specific reason not to.</p></li> </ol>

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