脚本

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

public class TypewriterEffect : MonoBehaviour {

    public float charsPerSecond = 0.2f;//打字时间间隔
    private string words;//保存需要显示的文字

    private bool isActive = false;
    private float timer;//计时器
    private Text myText;
    private int currentPos=0;

    void Start () {
        timer = 0;
        isActive = true;
        charsPerSecond = Mathf.Max (0.2f,charsPerSecond);
        myText = GetComponent<Text> ();
        words = myText.text;
        myText.text = "";//获取Text的文本信息，保存到words中，然后动态更新文本显示内容，实现打字机的效果
    }

    void Update () {
        OnStartWriter ();
        }

    public void StartEffect(){
        isActive = true;
    }
    /// <summary>
    /// 执行打字任务
    /// </summary>
    void OnStartWriter(){

        if(isActive){
            timer += Time.deltaTime;
            if(timer>=charsPerSecond){//判断计时器时间是否到达
                timer = 0;
                currentPos++;
                myText.text = words.Substring (0,currentPos);//刷新文本显示内容

                if(currentPos>=words.Length) {
                    OnFinish();
                }
            }

        }
    }
    /// <summary>
    /// 结束打字，初始化数据
    /// </summary>
    void OnFinish(){
        isActive = false;
        timer = 0;
        currentPos = 0;
        myText.text = words;
    }
}