title: Facebook login in Swift 3
body: <p>Hi I'm having a problem with FBLogin in <code>Swift</code> 
  It always displays</p>
  
  <blockquote>
    <p>"User cancelled login."</p>
  </blockquote>
  
  <p>in <code>iOS8.2</code> 
  and </p>
  
  <blockquote>
    <p>"Falling back to storing access token in <code>NSUserDefaults</code> because of simulator bug" </p>
  </blockquote>
  
  <p>when I use <code>iOS10.1</code> </p>
  
  <p>Do you have any suggestions regarding this issue?</p>
  
  <p><img src="https://i.stack.imgur.com/2kWCb.png" alt="enter image description here"></p>