title: How to addSubview with a position?
body: <p>I have something like this:</p>
  
  <pre><code>myViewController = [[MyViewController alloc] initWithNibName:@"MyView" bundle:nil];
  [mainCanvas addSubview: myViewController.view];
  self.view = mainCanvas;
  </code></pre>
  
  <p>It will be added at the position (0, 0), but I want to add it at (0, 100) or somewhere else. How can I do so?</p>