title: Transparent background for modally presented viewcontroller
body: <p>I am using Parse &amp; ParseUI.
  I want my PFLoginViewController subclass to have a transparent background. In the future, I want to lay a blurred view over the background.</p>
  
  <p>But.... Once the animate-in of the PFLoginViewController is done, the background turns black... Whilst during the animation the background was transparent.</p>
  
  <pre><code>func presentLogin() {
      var loginViewController = LoginViewController()
      var signupViewController = SignUpViewController()
  
      loginViewController.fields = .UsernameAndPassword | .LogInButton | .PasswordForgotten | .SignUpButton | PFLogInFields.DismissButton
      signupViewController.fields = .UsernameAndPassword | .Email | .DismissButton | .SignUpButton
      loginViewController.delegate = self
      loginViewController.logInView.backgroundColor = UIColor.clearColor()
      loginViewController.logInView.opaque = false
      signupViewController.delegate = self
  
      loginViewController.signUpController = signupViewController
  
      self.presentViewController(loginViewController, animated: true) { () -&gt; Void in
          //
      }
  }
  </code></pre>
  
  <p>My logincontroller's used subclass:</p>
  
  <pre><code>class LoginViewController: PFLogInViewController {
  
      @IBOutlet weak var _nmcLogoLabel: UILabel!
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
          // Do any additional setup after loading the view.
          let userName = SettingsManager.userName
          let password = SettingsManager.password
  
          self.logInView.usernameField.text = userName
          self.logInView.passwordField.text = password
  
          NSBundle.mainBundle().loadNibNamed("LoginViewBranding", owner: self, options: nil)[0] as? UIView
  
          self.logInView.logo = _nmcLogoLabel
  
      }
  
  }
  </code></pre>
  
  <p>How can I make it transparent?</p>
  
  <p>P.s. Applying the clearColor to the backgroundColor in the subclass makes no difference</p>