Objective C FCM如何在后台应用程序时获取远程消息

Question

我的代码可以获取远程通知和远程消息，最后一个问题是应用程序在后台时无法获取远程消息（只需打开应用程序就可以了）

• 当我在后台推送远程通知和应用程序时，似乎通知消息显示如预期，单击此通知然后将我带到我的应用程序。我不知道为什么远程消息没有这样的行为（我使用邮递员和“https://fcm.googleapis.com/fcm/send”发送远程消息）

  。请有人帮助我 这是我的代码

  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
      // Register for remote notifications
      if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_7_1) {
          // iOS 7.1 or earlier. Disable the deprecation warnings.
          UIRemoteNotificationType allNotificationTypes =
          (UIRemoteNotificationTypeSound |
           UIRemoteNotificationTypeAlert |
           UIRemoteNotificationTypeBadge);
          [application registerForRemoteNotificationTypes:allNotificationTypes];
  
      } else {
          // iOS 8 or later
          // [START register_for_notifications]
          if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_9_x_Max) {
              UIUserNotificationType allNotificationTypes =
              (UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge);
              UIUserNotificationSettings *settings =
              [UIUserNotificationSettings settingsForTypes:allNotificationTypes categories:nil];
              [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
          } else {
              // iOS 10 or later
    UNAuthorizationOptions authOptions =
              UNAuthorizationOptionAlert
              | UNAuthorizationOptionSound
              | UNAuthorizationOptionBadge;
              [[UNUserNotificationCenter currentNotificationCenter]
               requestAuthorizationWithOptions:authOptions
               completionHandler:^(BOOL granted, NSError * _Nullable error) {
               }
               ];
  
              // For iOS 10 display notification (sent via APNS)
              [[UNUserNotificationCenter currentNotificationCenter] setDelegate:self];
              // For iOS 10 data message (sent via FCM)
              [[FIRMessaging messaging] setRemoteMessageDelegate:self];
          }
  
          [[UIApplication sharedApplication] registerForRemoteNotifications];
          // [END register_for_notifications]
      }
  
      // [START configure_firebase]
      [FIRApp configure];
      // [END configure_firebase]
      // Add observer for InstanceID token refresh callback.
      [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(tokenRefreshNotification:)
                                                   name:kFIRInstanceIDTokenRefreshNotification object:nil];
  
      return YES;
  }
  
  // [START receive_message]
  - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
      // If you are receiving a notification message while your app is in the background,
      // this callback will not be fired till the user taps on the notification launching the application.
      // TODO: Handle data of notification
  
      // Print message ID.
      NSLog(@"didReceiveRemoteNotification1 ID: %@", userInfo[@"gcm.message_id"]);
  
      // Print full message.
      NSLog(@"didReceiveRemoteNotification1 %@", userInfo);
  }
  
  - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
  fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
      // If you are receiving a notification message while your app is in the background,
      // this callback will not be fired till the user taps on the notification launching the application.
      // TODO: Handle data of notification
  
      // Print message ID.
      NSLog(@"didReceiveRemoteNotification2 ID: %@", userInfo[@"gcm.message_id"]);
  
      // Print full message.
      NSLog(@"didReceiveRemoteNotification2 %@", userInfo);
  }
  - (void)userNotificationCenter:(UNUserNotificationCenter *)center
         willPresentNotification:(UNNotification *)notification
           withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
      // Print message ID.
      NSDictionary *userInfo = notification.request.content.userInfo;
      NSLog(@"willPresentNotification: %@", userInfo[@"gcm.message_id"]);
  
      // Print full message.
      NSLog(@"willPresentNotification %@", userInfo);
  }
  
  - (void)userNotificationCenter:(UNUserNotificationCenter *)center
  didReceiveNotificationResponse:(UNNotificationResponse *)response
           withCompletionHandler:(void (^)())completionHandler {
      NSDictionary *userInfo = response.notification.request.content.userInfo;
      NSLog(@"didReceiveNotificationResponse: %@", userInfo);
  }
  
  - (void)applicationReceivedRemoteMessage:(FIRMessagingRemoteMessage *)remoteMessage {
      NSLog(@"%@", [remoteMessage appData]);
      UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert" message:[NSString stringWithFormat:@"%@", [remoteMessage appData]] delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil];
      [alert show];
  }
  - (void)tokenRefreshNotification:(NSNotification *)notification {
  
      NSString *refreshedToken = [[FIRInstanceID instanceID] token];
      NSLog(@"InstanceID token: %@", refreshedToken);
      [self connectToFcm];
  }
  - (void)connectToFcm {
      [[FIRMessaging messaging] connectWithCompletion:^(NSError * _Nullable error) {
          if (error != nil) {
              NSLog(@"Unable to connect to FCM. %@", error);
          } else {
              NSLog(@"Connected to FCM.");
          }
      }];
  }
  - (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
      NSLog(@"Unable to register for remote notifications: %@", error);
  }
  - (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
      NSLog(@"APNs token retrieved: %@", deviceToken);
      [[FIRMessaging messaging] setAPNSToken:deviceToken];
  }
  
  - (void)applicationDidBecomeActive:(UIApplication *)application {
      [self connectToFcm];
  }
  
  - (void)applicationDidEnterBackground:(UIApplication *)application {
      [[FIRMessaging messaging] disconnect];
      NSLog(@"Disconnected from FCM");
  }
  

Answer 1

对于面临同样问题的其他人。

经过大量搜索，我终于找到了解决方案，非常简单，您需要按照 Firebase 应用程序消息的内容，使其能够被推送通知服务读取。你可以看到here 和here

这是让它在后台模式下显示给设备的示例:)

{
  "condition": "'condition1' in topics && 'condition2' in topics",
  "notification": {
      "category": "notification_category",
      "title_loc_key": "notification_title",
      "body_loc_key": "notification_body",
      "badge": 1
  },
  "data": {
    "data_type": "notification_data_type",
    "data_id": "111111",
    "data_detail": "FOO",
    "data_detail_body": "BAR"
  }
}

现在一切都像预期的那样工作，那么第二个工作就是按照你想要的方式修改消息内容:)