如何从视图控制器（不是AppDelegate）在IOS上设置Firebase？

Question

环境

• Xcode版本：9.4.1
• Firebase SDK版本：5
• Firebase组件：消息传递

问题

我正在尝试将Firebase消息传递集成到IOS中。我的目标是在应用程序处于前台和后台时都处理数据消息。

下面的示例主要是从https://firebase.google.com/docs/cloud-messaging/ios/client和一些SO中获得的。

我有以下三种设置Firebase的主要方法。我的两个主要要求是处理令牌更改和处理数据消息。

yield Request(url=response.url,
              method='POST',
              headers={
                  'Content-Type': 'application/json; charset=UTF-8',
              },
              body=json.dumps(self.postRequest),
              callback=self.parse_data,
              dont_filter=True,
              cookies=self.cookies)

从AppDelegate.m'didFinishLaunchingWithOptions'调用initFirebase时，它可以完美运行。令牌已设置。收到消息。

- (void)initFirebase{
[FIRApp configure];

if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_9_x_Max) {
    printf("\n#B initFirebase.IOS 9");
    UIUserNotificationType allNotificationTypes =
    (UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge);
    UIUserNotificationSettings *settings =
    [UIUserNotificationSettings settingsForTypes:allNotificationTypes categories:nil];
    [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
} else {
    // iOS 10 or later
#if defined(__IPHONE_10_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
    printf("\n#B initFirebase.IOS 10+");
    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].delegate = self;
    // For iOS 10 data message (sent via FCM)
    [FIRMessaging messaging].delegate = self;
#endif
}

[[UIApplication sharedApplication] registerForRemoteNotifications];
// NSLog(@"#B initFirebase.fir token is %@",[[FIRInstanceID instanceID] token]);
printf("\n#B initFirebase. token: %s", [[[FIRInstanceID instanceID] token] UTF8String]);//token is null here
}

// [START refresh_token]
//called everytime token changes. must register
- (void)messaging:(FIRMessaging *)messaging didReceiveRegistrationToken:(NSString *)fcmToken {
printf("\n#B didReceiveRegistrationToken. token: %s", [fcmToken UTF8String]);
//NSLog(@"FCM registration token: %@", fcmToken);
// Notify about received token.
NSDictionary *dataDict = [NSDictionary dictionaryWithObject:fcmToken forKey:@"token"];
[[NSNotificationCenter defaultCenter] postNotificationName:
 @"FCMToken" object:nil userInfo:dataDict];
// TODO: If necessary send token to application server.
// Note: This callback is fired at each app startup and whenever a new token is generated.
}
// [END refresh_token]

//called everytime a message is received. must call custom message handler
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler{
printf("\n#B application  didReceiveRemoteNotification message:");
//NSLog(@"#B received notification");
//handle the notification here
}

但是，我的要求是仅在用户从设置中选择选项时设置Firebase。

在单击按钮后调用“ initFirebase”代码时，仅调用“ didReceiveRegistrationToken”。

完全不接收消息。永远不会调用'didReceiveRemoteNotification'。

是否可以根据用户操作从控制器初始化Firebase？实现此目的的正确方法是什么？