title: How to convert Optional String to String
body: <pre><code>@IBOutlet var navBar: UINavigationBar!
  @IBOutlet var menuButton: UIBarButtonItem!
  @IBOutlet var topicNameLabel: UILabel!
  var topicName:String!
  override func viewDidLoad() {
      super.viewDidLoad()
  
      // Do any additional setup after loading the view.
      menuButton.target = self.revealViewController()
      menuButton.action = Selector("revealToggle:")
  
      navBar.barTintColor = UIColor(red: 0, green: 0.4176, blue: 0.4608, alpha: 1)
      topicNameLabel.text = self.topicName
  
  }
  </code></pre>
  
  <p>That's my code, I will pass a string to the topicName by prepareForSegue, however, I find that in the simulator, my topicNameLabel shows "Optional(The text I want)". I just want the "The text I want", but do not need the Optional. Could any one help me?</p>