Chat.swift

func insertMessage(sender: Sender, text: String) {
        let date = Date.init()
        let message = Message(sender: sender, messageId: "1", sentDate: date, kind: .text(text))
        messages.append(message)
        conversation.append(TextMessage(text: text, timestamp: date.timeIntervalSince1970, userID: sender.id, isLocalUser: isJohn))
        messagesCollectionView.reloadData()
        handleSmartReply()
    }
    
    func handleSmartReply() {
        naturalLanguage.smartReply().suggestReplies(for: conversation) { result, error in
            guard error == nil, let result = result else {
                return
            }
            if (result.status == .notSupportedLanguage) {
                // The conversation's language isn't supported, so the
                // the result doesn't contain any suggestions.
            } else if (result.status == .success) {
                // Successfully suggested smart replies.
                // ...
                let suggestions = result.suggestions.prefix(3).map{return $0.text}
                let suggestionsView = suggestions.map { return self.makeButton(named: $0)}
                self.messageInputBar.setStackViewItems(suggestionsView, forStack: .top, animated: true)
            }
        }
    }