firebase-ios-sdk/Example/Messaging/App/iOS/NotificationService/NotificationService.m

/*
 * Copyright 2019 Google
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import "NotificationService.h"

@interface NotificationService ()

@property(nonatomic, strong) void (^contentHandler)(UNNotificationContent *contentToDeliver);
@property(nonatomic, strong) UNMutableNotificationContent *bestAttemptContent;

@end

@implementation NotificationService

- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request
                   withContentHandler:(void (^)(UNNotificationContent *_Nonnull))contentHandler {
  self.contentHandler = contentHandler;
  self.bestAttemptContent = [request.content mutableCopy];

  // Modify the notification content here...
  self.bestAttemptContent.title =
      [NSString stringWithFormat:@"%@ [modified]", self.bestAttemptContent.title];

  self.contentHandler(self.bestAttemptContent);
}

- (void)serviceExtensionTimeWillExpire {
  // Called just before the extension will be terminated by the system.
  // Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the
  // original push payload will be used.
  self.contentHandler(self.bestAttemptContent);
}

@end