仅当iOS应用程序处于后台时，才会显示Firebase Cloud Message

Question

我正在将Firebase云消息传递集成到React Native应用程序中，并且在iOS上有一个很好的问题：如果应用程序在后台，通知会按预期显示，但如果应用程序在前台，则没有任何反应。< / p>

我已经从RNFirebase文档中添加了AppDelegate.m代码，包括我理解为iOS 10新增的withCompletionHandler变体：

// From https://rnfirebase.io/docs/v3.3.x/messaging/ios:
-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {
    [RNFirebaseMessaging didReceiveLocalNotification:notification];
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(nonnull NSDictionary *)userInfo {
    [RNFirebaseMessaging didReceiveRemoteNotification:userInfo];
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(nonnull NSDictionary *)userInfo
fetchCompletionHandler:(nonnull void (^)(UIBackgroundFetchResult))completionHandler{
    [RNFirebaseMessaging didReceiveRemoteNotification:userInfo fetchCompletionHandler:completionHandler];
}

- (void)userNotificationCenter:(UNUserNotificationCenter *)center
       willPresentNotification:(UNNotification *)notification
         withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
    [RNFirebaseMessaging willPresentNotification:notification withCompletionHandler:completionHandler];
}

- (void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
         withCompletionHandler:(void (^)(void))completionHandler {
    [RNFirebaseMessaging didReceiveNotificationResponse:response withCompletionHandler:completionHandler];

在react-native应用程序中，我有一个onMessage处理程序，它可以在iOS模拟器和Android上宣传：

// ...Initializing Firebase...
messaging.onMessage(handleMessage);

// Handle a message:
function handleMessage(message) {
  console.log('Firebase: Received message:', message);

  const theActualMessage = message.fcm ? message.fcm : message.notification;

  if (typeof message.finish === 'function') {
    message.finish();
  }

  Alert.alert('Push message', theActualMessage.body);
}

无论是从Firebase控制台还是通过HTTP API发送推送通知，如果应用程序位于后台，通知仅会显示在iOS（在真实设备上）上;我永远不会调用handleMessage()函数。

在iOS模拟器，Android模拟器和Android手机上，我的处理程序按预期调用 - 只有真正的iOS设备行为不端。