title: (iOS) NSMutableArray as property addObject does nothing
body: <p>I have a subclass of <code>UIViewController</code> with an <code>NSMutableArray</code> as a property to use as the data source for a <code>UITableView</code>.  I create an instance of the class in my storyboard.</p>
  
  <p>I want to populate the array with the <code>addObject:</code> method but if I try, the array always returns <code>(null)</code>.</p>
  
  <p>I read that <code>@synthesize</code> doesn't init the array and I might need to override <code>-init</code> and init the <code>NSMutableArray</code> there but <code>-init</code> never gets called.</p>
  
  <p>How is this supposed to work?</p>