Unity

DialogueSystem.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class DialogueSystem : MonoBehaviour
{
    public ProgressiveText dialogueText;

    public static DialogueSystem Instance { get; set; }
    public GameObject dialoguePanel;
    public string npcName;
    public List<string> dialogueLines = new List<string>();

    Button continueButton;
    Text nameText;
    int dialogueIndex;



    private void Awake()
    {
        dialoguePanel.SetActive(false);
        continueButton = dialoguePanel.transform.Find("Continue").GetComponent<Button>();
        nameText = dialoguePanel.transform.Find("Name").GetChild(0).GetComponent<Text>();
        continueButton.onClick.AddListener(delegate { ContinueDialogue(); });
        dialoguePanel.SetActive(false);
        if(Instance != null && Instance != this)
        {
            Destroy(gameObject);
        }
        else
        {
            Instance = this;
        }
    }
    public void AddNewDialogue(string[] lines, string npcName)
    {
        dialogueIndex = 0;
        dialogueLines = new List<string>(lines.Length);
        dialogueLines.AddRange(lines);

        this.npcName = npcName;
        Debug.Log(dialogueLines.Count);
        CreateDialogue();
    }





    public void CreateDialogue()
    {
        dialoguePanel.SetActive(true);
        dialogueText.ShowText(dialogueLines[0]);
        nameText.text = npcName;
    }

    public void ContinueDialogue()
    {
        if(dialogueIndex < dialogueLines.Count-1)
        {
            dialogueIndex++;
            dialogueText.ShowText(dialogueLines[dialogueIndex]);
        }
        else
        {
            dialoguePanel.SetActive(false);
        }
    }
}

ProgressiveText.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(Text))]
public class ProgressiveText : MonoBehaviour
{
    public float pause = 1.0f;

    private string _message = String.Empty;
    private Text _textUI;

    private IEnumerator activeCoroutine;
    private int index;

    private void Awake()
    {
        _textUI = GetComponent<Text>();
        activeCoroutine = InternalShowText();
    }

    public void ShowText(string text)
    {
        _message = text;
        _textUI.text = "";
        StopCoroutine(activeCoroutine);
        index = 1;
        StartCoroutine(activeCoroutine);
    }

    private IEnumerator InternalShowText()
    {
        for (; index <= _message.Length; index++)
        {
            _textUI.text = _message.Substring(0, index);
            yield return new WaitForSeconds(pause);
        }
    }
}