[Payment Request] Contact Info editor

ios/chrome/browser/ui/payments/payment_request_edit_view_controller.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_EDIT_VIEW_CONTROLLER_H_
 #define IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_EDIT_VIEW_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 #include <vector>
 
 #import "ios/chrome/browser/ui/autofill/autofill_ui_type.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_controller.h"
 #import "ios/chrome/browser/ui/payments/payment_request_edit_consumer.h"
 #import "ios/chrome/browser/ui/payments/payment_request_edit_view_controller_data_source.h"
 
 extern NSString* const kWarningMessageAccessibilityID;
 
 @class EditorField;
 @class PaymentRequestEditViewController;
 
 // Delegate protocol for PaymentRequestEditViewController.
 @protocol PaymentRequestEditViewControllerDelegate<NSObject>
 
-// Notifies the delegate that the user has selected |field|.
-- (void)paymentRequestEditViewController:
-            (PaymentRequestEditViewController*)controller
-                          didSelectField:(EditorField*)field;
-
 // Notifies the delegate that the user has finished editing the editor fields.
 - (void)paymentRequestEditViewController:
             (PaymentRequestEditViewController*)controller
                   didFinishEditingFields:(NSArray<EditorField*>*)fields;
 
 // Notifies the delegate that the user has chosen to discard entries in the
 // editor fields and return to the previous screen.
 - (void)paymentRequestEditViewControllerDidCancel:
     (PaymentRequestEditViewController*)controller;
 
+@optional
+
+// Notifies the delegate that the user has selected |field|.
+- (void)paymentRequestEditViewController:
+            (PaymentRequestEditViewController*)controller
+                          didSelectField:(EditorField*)field;
+
 @end
 
 // Validator protocol for PaymentRequestEditViewController.
 @protocol PaymentRequestEditViewControllerValidator<NSObject>
 
 // Returns the validation error string for |field|. Returns nil if there are no
 // validation errors.
 - (NSString*)paymentRequestEditViewController:
                  (PaymentRequestEditViewController*)controller
                                 validateField:(EditorField*)field;
@@ skipping 21 matching lines @@
     validatorDelegate;
 
 // Convenience initializer. Initializes this view controller with the
 // CollectionViewControllerStyleAppBar style and sets up the leading (cancel)
 // and the trailing (done) buttons.
 - (instancetype)init;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_PAYMENTS_PAYMENT_REQUEST_EDIT_VIEW_CONTROLLER_H_