title: How to access profile picture with Facebook API in Swift 3?
body: <p>Earlier I tried to access like this:</p>
  
  <pre><code>let gr2 : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id,picture.width(198).height(198)"])
  gr2.start(completionHandler: { (connection, result2, error) -&gt; Void in                
  let data = result2 as! [String : AnyObject]
  let _loggedInUserSettingRecordName = data["id"] as? String // (forKey: "id") as? String
  let profilePictureURLStr = data["picture.data.url"] as? String
  </code></pre>
  
  <p>But <code>profilePictureURLStr</code> is nil now. What is different with Swift 3?</p>
  
  <p>I can see url info is part of it:</p>
  
  <pre><code>(lldb) po result2
  ▿ Optional&lt;Any&gt;
    ▿ some : 2 elements
      ▿ 0 : 2 elements
        - .0 : id
        - .1 : 10208273026137463
      ▿ 1 : 2 elements
        - .0 : picture
        ▿ .1 : 1 element
          ▿ 0 : 2 elements
            - .0 : data
            ▿ .1 : 4 elements
              ▿ 0 : 2 elements
                - .0 : is_silhouette
                - .1 : 0
              ▿ 1 : 2 elements
                - .0 : height
                - .1 : 200
              ▿ 2 : 2 elements
                - .0 : url
                - .1 : https://scontent.xx.fbcdn.net/v/t1.0-1/p200x200/13418946_10208553701714177_3969269576626117653_n.jpg?oh=add39246ec9693ecead0529ecbbbfc53&amp;oe=5862D7ED
              ▿ 3 : 2 elements
                - .0 : width
                - .1 : 200
  </code></pre>