title: About self.view = nil in ARC
body: <p>I'm just wondering about self.view = nil in ARC. </p>
  
  <ol>
  <li>when set self.view = nil, self.view will be automatically released?</li>
  <li>When set self.view = nil, all the subviews will be automatically nil and released?</li>
  </ol>
  
  <p>Thanks</p>