title: Make iOS bar button item for iOS 6 to look like iOS 7 UIBarButtonSystemItemAdd
body: <p>I want to use a UILabel with the text set as @"+" to look like the UIBarButtonSystemItemAdd in iOS 7. So far I have...</p>
  
  <pre><code>UILabel *lbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 35, 35)];
  [lbl setText:@"+"];
  [lbl setFont:[UIFont systemFontOfSize:36]];
  [lbl setTextAlignment:NSTextAlignmentCenter];
  addButton = [[UIBarButtonItem alloc] initWithCustomView:lbl];
  </code></pre>
  
  <p>... but the problem is the + isn't vertically central on the nav bar. I've tried changing the frame of the label but the + always appears in the same place, slightly too low.</p>
  
  <p>Any ideas?</p>