title: UIKit - awakeFromNib if not implemented
body: <p>From Xcode 8 update it just noticed that, for <code>UITableViewCell</code>'s <code>awakeFromNib</code> method with no content inside(automatically created while adding custom cell class with xib file), giving me the following warning. </p>
  
  <blockquote>
    <p>Method possibly missing a [super awakeFromNib] call</p>
  </blockquote>
  
  <p>From this <a href="https://stackoverflow.com/a/6446391/3743322">link</a>, got idea why should we implement super class methods. But I need to know what will be the impact if we are not implementing this method. </p>
  
  <p>Is there any performance issues or any other kind of issues, in case if <code>awakeFromNib</code> in any of the subclasses of UIKit classes is not implemented?</p>