Swift segue not working?
<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>