我看到的第一件事是没有调用连接到 FIRMessaging.尝试将其添加到您的 AppDelegate:

The first thing I see is there's no call to connect to FIRMessaging. Try adding this to your AppDelegate:

func applicationDidBecomeActive(application: UIApplication) {
    FIRMessaging.messaging().connectWithCompletion { error in
        print(error)
    }
}