to whom the message should be sent. open var recipients: [INPerson]? { get } // Body text of the message. open var content: String? { get } @NSCopying open var speakableGroupName: INSpeakableString? { get } open var conversationIdentifier: String? { get } // Specified service for the message. open var serviceName: String? { get } // The person, or account, sending the message. @NSCopying open var sender: INPerson? { get } }