Correct way to retrieve token for FCM - iOS 10 Swift 3

Question

i had implement Firebase with FirebaseAuth/FCM etc and did sent notification successfully through Firebase Console.

However i would need to push the notification from m

Answer 1

First register for the firebase token refresh notification:

NotificationCenter.default.addObserver(self, selector: 
     #selector(tokenRefreshNotification), name:     
     NSNotification.Name.InstanceIDTokenRefresh, object: nil)

Then you can receive the token in the tokenRefreshNotification selector:

func tokenRefreshNotification(_ notification: Notification) {
    if let refreshedToken = FIRInstanceID.instanceID().token() {
      print("InstanceID token: \(refreshedToken)")
    }

    // Connect to FCM since connection may have failed when attempted before having a token.
    connectToFcm()
}