Simple UI script for NodeCanvas dialogue tree.

NcSimpleDialogueUi.cs

using System.Collections.Generic;
using UnityEngine;
using NodeCanvas.DialogueTrees;
using TMPro;
using UnityEngine.UI;
using NodeCanvas.Framework;

public class NcSimpleDialogueUi : MonoBehaviour
{
    public TextMeshProUGUI NarrationText;
    public Button AnswerButtonPrefab; // NOTE: NOT a scene object!!
    public Transform ButtonsParent;
    public DialogueTreeController DialogueTreeController;

    //public Blackboard Blackboard; // uncomment if you want to use variables, e.g. List<Variable> results = Blackboard.GetVariables().ToList();

    #region SETUP
    private void Awake()
    {
        DialogueTree.OnDialogueStarted += OnDialogueStarted;
        DialogueTree.OnSubtitlesRequest += OnSubtitlesRequest;
        DialogueTree.OnDialogueFinished += OnDialogueFinished;
        DialogueTree.OnMultipleChoiceRequest += OnMultipleChoiceRequest;
    }

    void OnDisable() { UnSubscribe(); }

    void UnSubscribe()
    {
        DialogueTree.OnDialogueStarted -= OnDialogueStarted;
        DialogueTree.OnDialogueFinished -= OnDialogueFinished;
        DialogueTree.OnSubtitlesRequest -= OnSubtitlesRequest;
        DialogueTree.OnMultipleChoiceRequest -= OnMultipleChoiceRequest;
    }
    #endregion

    private void Start()
    {
        DialogueTreeController.StartDialogue();
    }

    void OnDialogueStarted(DialogueTree dlg)
    {
        //print("started");
    }

    void OnSubtitlesRequest(SubtitlesRequestInfo info)
    {
        NarrationText.text = info.statement.text;
        info.Continue();
    }

    void OnMultipleChoiceRequest(MultipleChoiceRequestInfo info)
    {
        //print("mult choice request");

        if (ButtonsParent)
        {
            for (int i = 0; i < ButtonsParent.childCount; i++)
            {
                Destroy(ButtonsParent.transform.GetChild(i).gameObject);
            }
        }

        foreach (KeyValuePair<IStatement, int> pair in info.options)
        {
            Button btn = Instantiate(AnswerButtonPrefab, ButtonsParent);
            btn.GetComponentInChildren<TextMeshProUGUI>().text = pair.Key.text;
            btn.onClick.AddListener(() => { SelectOption(info, pair.Value); });
        }
    }

    private void SelectOption(MultipleChoiceRequestInfo info, int index)
    {
        info.SelectOption(index);
    }

    void OnDialogueFinished(DialogueTree dlg)
    {
        //print("finished");
        if (ButtonsParent)
        {
            for (int i = 0; i < ButtonsParent.childCount; i++)
            {
                Destroy(ButtonsParent.transform.GetChild(i).gameObject);
            }
        }
    }
}