title: WKWebView vs SFSafariViewController
body: <p>We have <code>WKWebView</code> in iOS 8 and <code>SFSafariViewController</code> in iOS 9. 
  I know that <code>WKWebView</code> subclasses from <code>UIView</code>, and that <code>SFSafariViewController</code> subclasses from <code>UIViewController</code>.<br>
  They are essentially different.</p>
  
  <p><br>
  My question is about memory management between these two components.<br>
  Quoted from developers at Facebook, <a href="https://code.facebook.com/posts/1146930688654547/reducing-fooms-in-the-facebook-ios-app/" rel="nofollow">Reducing FOOMs in the Facebook iOS app</a> </p>
  
  <blockquote>
    <p>WKWebView — that actually performs most of its work in a separate process, which means that most web-view-related memory usage would not be attributed to our process.</p>
  </blockquote>
  
  <p>This helps a lot in preventing our app from being killed because our process consumes a large amount of memory.</p>
  
  <p>Does SFSafariViewController handle web-view-related memory in a separate process like WKWebView?</p>