Messaging
class Messaging : NSObjectFirebase Messaging lets you reliably deliver messages at no cost.
To send or receive messages, the app must get a registration token from FIRInstanceID. This token authorizes an app server to send messages to an app instance.
In order to receive FIRMessaging messages, declare
application:didReceiveRemoteNotification::fetchCompletionHandler:.
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Delegate to handle FCM token refreshes, and remote data messages received via FCM direct channel.
Declaration
Swift
weak var delegate: MessagingDelegate? { get set } -