打字机

 日期：2020/11/20 16:56:23
    功能：打字机功能
*****************************************************/
using UnityEngine;
using UnityEngine.UI;
public class TxtTools : MonoBehaviour 
{
    [Header("打字间隔")]public float typeTimer=0.2f;
    [Header("打字的内容")]public string words;
    private Text txtFile;
    private bool isStartTyping=true;//是否开始打字
    private float timer;
    private int currentIndex = 0;
    private void Start()
    {
        txtFile = GetComponent<Text>();
        //返回两个或多个值中最大的值
        typeTimer = Mathf.Max(0.02f, typeTimer);
    }
    private void Update()
    {
        OnStartTyping();
    }
    private void OnStartTyping()
    {
        if (isStartTyping)
        {
            timer += Time.deltaTime;
            if (timer >= typeTimer)
            {
                timer = 0;
                currentIndex++;
                txtFile.text = words.Substring(0,currentIndex);
                if (currentIndex>=words.Length)
                {
                    OnFinshTyping();
                }
            }
        }
    }
    private void OnFinshTyping()
    {
        isStartTyping = false;
        timer = 0;
        currentIndex = 0;
        txtFile.text = words;
    }
}