如何以编程方式清除iMessage扩展中的输入字段？

Question

好的，我已经到处寻找并且无法在此找到一篇文章。我正在构建一个iMessage扩展应用程序，我需要知道IF以及如何以编程方式清除iMessage文本输入字段。不一定要编辑内容，只需删除已放置的所有文本/贴纸。

我的意思是这里没有发送消息：

我知道我们拥有所有这些，并且我使用最后两个来查看贴纸是否已经发送或者是否已在输入字段中取消。

override func willBecomeActive(with conversation: MSConversation) {
        // Called when the extension is about to move from the inactive to active state.
        // This will happen when the extension is about to present UI.

        // Use this method to configure the extension and restore previously stored state.
    }

    override func didResignActive(with conversation: MSConversation) {
        // Called when the extension is about to move from the active to inactive state.
        // This will happen when the user dissmises the extension, changes to a different
        // conversation or quits Messages.

        // Use this method to release shared resources, save user data, invalidate timers,
        // and store enough state information to restore your extension to its current state
        // in case it is terminated later.
    }

    override func didReceive(_ message: MSMessage, conversation: MSConversation) {
        // Called when a message arrives that was generated by another instance of this
        // extension on a remote device.

        // Use this method to trigger UI updates in response to the message.
    }

    override func didStartSending(_ message: MSMessage, conversation: MSConversation) {
        // Called when the user taps the send button.
        print("sent icon")
    }

    override func didCancelSending(_ message: MSMessage, conversation: MSConversation) {
        // Called when the user deletes the message without sending it.

        // Use this to clean up state related to the deleted message.
        print("nope, icon not sent")
    }

我该怎么做，或者similaR？