title: How to set UISegmentedControl Tint Color for individual segment
body: <p>Starting to learn Swift and am attempting to convert this ObjectiveC code:</p>
  
  <pre><code>[[mySegmentedControl.subviews objectAtIndex:0] setTintColor:[UIColor blueColor]]
  </code></pre>
  
  <p>This correctly sets the tint color of the first segment.</p>
  
  <hr>
  
  <p>This is the closest I've come to getting a Swift version of the same code:</p>
  
  <pre><code>mySegmentedControl?.subviews[0].tintColor = UIColor.blueColor()
  </code></pre>
  
  <p>The error I get is <code>'@Ivalue $T9' is not identical to 'UIColor!!'</code></p>
  
  <hr>
  
  <p>I don't understand what this error means. When I look at the <code>.tintColor</code> method it list <code>UIColor!?</code> and I haven't found what the <code>!?</code> together means in Swift yet.</p>