ugui中text的打字机渐显功能

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项目中有涉及到，就贴出来交流
using UnityEngine;using System.Collections;using UnityEngine.UI;using System.Collections.Generic;public class Typewriter_alpha : MonoBehaviour {    public float TimeSpan = 0.1f;    public int ColorSpan = 50;//1-50    public bool ColorAlphaSpan = true;    private bool changeFlag = true;    private string originStr;    private string nowStr;    private int index;    private float timePiece;    private string originColor;    private Dictionary<int,int> alphaLine = new Dictionary<int, int>();    private string ColorToHex(Color color){        int Val = 0;        Val |= Mathf.RoundToInt (color.r * 255f) << 24;        Val |= Mathf.RoundToInt (color.g * 255f) << 16;        Val |= Mathf.RoundToInt (color.b * 255f) << 8;        Val |= Mathf.RoundToInt (color.a * 255f);        return Val.ToString ("x8").Substring(0,6); //返回值去掉alpha值    }    //<color=#0000ff00></color> rgba a:0%00 25%40 50%80 100%ff     //使单字透明度渐变 需要加注     // Use this for initialization    void OnEnable () {        originStr = this.GetComponent<Text> ().text;        originColor = ColorToHex (this.GetComponent<Text> ().color);        this.GetComponent<Text> ().text = "";        nowStr = "";        index = 1;        changeFlag = true;        timePiece = Time.time;        alphaLine.Clear ();        if (ColorAlphaSpan)            alphaLine.Add (0, 0);    }    // Update is called once per frame    void Update () {        if (Time.time - timePiece > TimeSpan&&changeFlag) {            if (ColorAlphaSpan) {                if (alphaLine.Count != 0) {                    for (int i = 0; i < index; ++i) {                        if (i == index - 1 && !alphaLine.ContainsKey (i)) {                            alphaLine.Add (i, 0);                        }                        if (alphaLine.ContainsKey (i)) {                            if (alphaLine [i] >= 100) {                                alphaLine.Remove (i);                                nowStr += originStr.Substring (i, 1);                                if (alphaLine.Count == 0)                                    nowStr = originStr;                            } else {                                nowStr += "<color=#" + originColor;                                //int值小于10的时候补个0 不然就显示为白色而不是透明度很低的颜色了                                if (alphaLine [i] < 10)                                    nowStr += "0"+alphaLine[i]+">";                                else                                    nowStr += alphaLine [i].ToString () + ">";                                nowStr += originStr.Substring (i, 1);                                nowStr += "</color>";                                alphaLine [i] += ColorSpan;                            }                        } else {                            nowStr += originStr.Substring (i, 1);                        }                    }                    this.GetComponent<Text> ().text = nowStr;                    nowStr = "";                    if (index < originStr.Length)                        index++;                } else {                    changeFlag = false;                }            } else {                this.GetComponent<Text> ().text = originStr.Substring (0, index++);                if (index > originStr.Length)                    changeFlag = false;            }            timePiece = Time.time;        }    }}
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