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我正在将 Firebase Cloud Messaging 集成到 React Native 应用程序中，并且在 iOS 上遇到了一个小问题：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，则什么也不会发生。

我已经从 RNFirebase 文档中添加了 AppDelegate.m 代码，包括我理解的 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，它的工作方式与 iOS 模拟器和 Android 中宣传的一样：

// ...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);
}

无论我是从 Firebase 控制台还是通过 HTTP API 发送推送通知，如果应用程序在后台，通知只会出现在 iOS（在真实设备上）；我的handleMessage()函数永远不会被调用。

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 设备行为异常。

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