unity 获取UGUI中的Text字的坐标

using System.Collections;
using UnityEngine;
using UnityEngine.UI;public class TextMoveHelper : MonoBehaviour { public Text textComp;
public Canvas canvas; public Text text; public Vector3 GetPosAtText(Canvas canvas, Text text,string strFragment)
{
int strFragmentIndex = text.text.IndexOf(strFragment);//-1表示不包含strFragment
Vector3 stringPos = Vector3.zero;
if (strFragmentIndex>-)
{
Vector3 firstPos = GetPosAtText(canvas, text, strFragmentIndex + );
Vector3 lastPos= GetPosAtText(canvas, text, strFragmentIndex+strFragment.Length);
stringPos = (firstPos + lastPos) * 0.5f;
}
else
{
stringPos= GetPosAtText(canvas, text, strFragmentIndex);
}
return stringPos;
} /// <summary>
/// 得到Text中字符的位置；canvas:所在的Canvas，text:需要定位的Text,charIndex:Text中的字符位置
/// </summary>
public Vector3 GetPosAtText(Canvas canvas,Text text,int charIndex)
{
string textStr = text.text;
Vector3 charPos = Vector3.zero;
if (charIndex <= textStr.Length && charIndex > )
{
TextGenerator textGen = new TextGenerator(textStr.Length);
Vector2 extents = text.gameObject.GetComponent<RectTransform>().rect.size;
textGen.Populate(textStr, text.GetGenerationSettings(extents)); int newLine = textStr.Substring(, charIndex).Split('\n').Length - ;
int whiteSpace = textStr.Substring(, charIndex).Split(' ').Length - ;
int indexOfTextQuad = (charIndex * ) + (newLine * ) - ;
if (indexOfTextQuad < textGen.vertexCount)
{
charPos = (textGen.verts[indexOfTextQuad].position +
textGen.verts[indexOfTextQuad + ].position +
textGen.verts[indexOfTextQuad + ].position +
textGen.verts[indexOfTextQuad + ].position) / 4f; }
}
charPos /= canvas.scaleFactor;//适应不同分辨率的屏幕
charPos = text.transform.TransformPoint(charPos);//转换为世界坐标
return charPos;
} string a = "跟";
string b = "一起";
string c = "学习";
string d = "学习中文";
int i = ;
void OnGUI()
{
if (GUI.Button(new Rect(, , , ), "Test"))
{
switch (i)
{
case :
StartCoroutine(LerpMove(a));
break;
case :
StartCoroutine(LerpMove(b));
break;
case :
StartCoroutine(LerpMove(c));
break;
case :
StartCoroutine(LerpMove(d));
i = -;
break;
}
i++; }
}
IEnumerator LerpMove(string content)
{
text.text = content;
text.rectTransform.position = GetPosAtText(canvas, textComp, content);
Vector3 endPos = canvas.transform.TransformPoint(Vector3.zero);
yield return new WaitForSeconds(0.3f);
yield return new WaitUntil(() =>{
text.rectTransform.position = Vector3.Lerp(text.rectTransform.position, endPos, Time.deltaTime);
return Vector3.Distance(text.rectTransform.position, endPos) <0.1f; }); }}