title: Format String in Swift
body: <p>I have a String saved in an NSDictionary named <code>accountInfoDict</code> that I received from my iPhone app.  I want to show this string using Swift in my watch kit app.</p>
  
  <p>This is how I am trying to display the string:</p>
  
  <pre><code>self.pointsLabel.setText(String(format: "%@ points",
  arguments: accountInfoDict!["points"] as? String))
  </code></pre>
  
  <p>I get an error message saying:</p>
  
  <blockquote>
    <p>Cannot convert value of type 'String?' to expected argument type '[CVarArgType]'</p>
  </blockquote>
  
  <p>Does anyone know what this means and how I can format my string to make this work?  Thanks!</p>
  
  <p><strong>Note:</strong></p>
  
  <p>The string displays correctly when I do it like this:</p>
  
  <pre><code>self.pointsLabel.setText(accountInfoDict!["points"] as? String)
  </code></pre>
  
  <p>But I want to add "points" to the end of the string. </p>