         super.viewWillAppear(animated)
 
         self.hideNavBar()
-        if let button = self.navigationItem.leftBarButtonItem {
+        
+        if let _ = self.navigationItem.leftBarButtonItem {
                self.navigationItem.leftBarButtonItem!.action = #selector(invokeCallbackCancelShowingNavBar)
         }
 

        let height2 = heightOfItem(indexItem: index2)

        return height1 > height2 ? height1 : height2

    }

    func heightOfItem(indexItem: Int) -> CGFloat {

        self.hideLoading()
    }

    fileprivate func cardFormCallbackCancel() -> (() -> Void) {
        return { () -> Void in
            if self.viewModel.getDisplayedPaymentMethodsCount() > 1 {
                self.navigationController!.popToViewController(self, animated: true)
            } else {
                self.loadingGroups = false
                self.callbackCancel!()
            }
        }
    }

    fileprivate func getCustomerCards() {
        
        if self.viewModel!.shouldGetCustomerCardsInfo() {
            if let _ = MercadoPagoCheckoutViewModel.servicePreference.getCustomerURL() {
                self.viewModel.mercadoPagoServicesAdapter.getCustomer(callback: { [weak self] (customer) in
                    self?.viewModel.customerId = customer._id
                    self?.viewModel.customerPaymentOptions = customer.cards
                    self?.loadPaymentMethodSearch()
                }, failure: { (error) in
                    // Ir a Grupos igual
                    self.loadPaymentMethodSearch()
                })
            }
        } else {
            self.loadPaymentMethodSearch()
        }
