title: Can't set UIImageView image
body: <p>I'm using an if statement to set a <code>UIImageView</code>'s image depending on the value of a variable. This is the statement:</p>
  
  <pre><code>- (void)configureView
  {    
      if (self.detailItem) {
          if ([detailItem isEqualToNumber:[NSNumber numberWithInt:0]]) {
              [mapImageView setImage:[UIImage imageNamed:@"0.jpg"]];
              NSLog(@"derp");
          }
      }
  }
  </code></pre>
  
  <p>"derp" gets printed but the <code>UIImageView</code>'s image won't change... If I put the <code>setImage:</code> statement in <code>viewDidLoad</code> it works fine. What am I doing wrongly?</p>