title: Swift segue not working?
body: <p>My Swift segue is not working at all and isn't throwing any errors. The breakpoint shows me that the app lands on this line but nothing happens:</p>
  
  <pre><code>self.performSegueWithIdentifier("SignupSegue", sender: self)
  </code></pre>
  
  <p>The code block is a login form with Facebook:</p>
  
  <pre><code>if let accessToken: FBSDKAccessToken = FBSDKAccessToken.currentAccessToken() {
      PFFacebookUtils.logInInBackgroundWithAccessToken(result.token, block: {
          (user: PFUser ? , error : NSError ? ) - &gt; Void in
          if user!.isNew {
              self.performSegueWithIdentifier("SignupSegue", sender: self)
          } else {
              self.navigateToInGame(true)
          }
      })
  }
  </code></pre>
  
  <p>Here's the segue function it should call, but doesn't even get to it:</p>
  
  <pre><code>override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
      {
          if (segue.identifier == "SignupSegue") {
              let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
              let vc = storyboard.instantiateViewControllerWithIdentifier("SignUpViewController") 
              self.showViewController(vc, sender: self)
          }
      }
  </code></pre>
  
  <p>Any ideas?</p>