 
                     self.loginButtonTopConstraint = make.top.equalTo(self.userInfoInputView.questionSelectButton.snp.bottom).offset(12.0).constraint
                 }
+                dynamicAnimator?.removeAllBehaviors()
+                containerView.setNeedsLayout()
             case .notLoginWithAnswerField:
                 userInfoInputView.usernameField.isEnabled = true
                 userInfoInputView.passwordField.alpha = 1.0


                    self.loginButtonTopConstraint = make.top.equalTo(self.userInfoInputView.answerField.snp.bottom).offset(12.0).constraint
                }
            case .login:
                userInfoInputView.usernameField.isEnabled = false
                userInfoInputView.passwordField.alpha = 0.0


// MARK: Helper
extension S1LoginViewController {
    fileprivate func alert(title: String, message: String) {
        let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
        alertController.addAction(UIAlertAction(title: NSLocalizedString("Message_OK", comment:""), style: .cancel, handler: nil))
