title: Unable to add attributed string with font Avenir Next Condensed [Swift 3]
body: <pre><code>    let s = NSAttributedString(string: "Percentage", attributes: [NSFontAttributeName : UIFont(name : "Avenir Next Condensed", size : 20), NSUnderlineStyleAttributeName : NSUnderlineStyle.byWord])
      textView.attributedText = s
  </code></pre>
  
  <p>I get the following error for the above code:
  Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_SwiftValue _isDefaultFace]: unrecognized selector sent to instance 0x608000046930'</p>
  
  <p>If I change the NSFontAttributeName to UIFont.boldSystemFont(ofSize: 20), I can see bold text. 
  Also on adding NSUnderlineStyleAttributeName, I don't see any text at all.
  How can I fix this?</p>