UGUI实现随意调整Text中的字体间距

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

public class TextSpacingTest : BaseMeshEffect
{
 public float spacing = 0;
 public override void ModifyMesh(VertexHelper vh)
 {
  List<UIVertex> vertexs = new List<UIVertex>();
  vh.GetUIVertexStream(vertexs);
  int vertexIndexCount = vertexs.Count;
  for (int i = 6; i < vertexIndexCount; i++)
  {
   UIVertex v = vertexs[i];
   v.position += new Vector3(spacing * (i / 6), 0, 0);
   vertexs[i] = v;
   if (i % 6 <= 2)
   {
    vh.SetUIVertex(v, (i / 6) * 4 + i % 6);
   }
   if (i % 6 == 4)
   {
    vh.SetUIVertex(v, (i / 6) * 4 + i % 6 - 1);
   }
  }
 }
}

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


internal class Line
{
 //每行开始顶点索引
 private int startVertexIndex;
 public int StartVertexIndex
 {
  get
  {
   return startVertexIndex;
  }
 }

 //每行结束顶点索引
 private int endVertexIndex;
 public int EndVertexIndex
 {
  get
  {
   return endVertexIndex;
  }
 }

 //每行顶点总量
 private int countVertexIndex;
 public int CountVertexIndex
 {
  get
  {
   return countVertexIndex;
  }
 }

 public Line(int startVertexIndex,int countVertexIndex)
 {
  this.startVertexIndex = startVertexIndex;
  this.countVertexIndex = countVertexIndex;
  this.endVertexIndex = this.startVertexIndex + countVertexIndex - 1;

 }
}

/// <summary>
/// 这是设置字体移动的核心类
/// 执行多重行移动的核心算法是：将多重行分开依次进行处理，每一行的处理都是前面对单行处理的子操作
/// 但是由vh是记录一个文本中所有的字的顶点，所以说需要分清楚每行开始，每行结束，以及行的字个数，
/// 如此需要创建一个行的数据结构，以保存这些信息
/// </summary>
public class TextSpacingMulTest : BaseMeshEffect
{
 public float spacing = 0;
 public override void ModifyMesh(VertexHelper vh)
 {
  Text text = GetComponent<Text>();
  string[] ls = text.text.Split('\n');
  int length = ls.Length;
  bool isNewLine = false;
  Line[] line;
  if (string.IsNullOrEmpty(ls[ls.Length - 1]) == true)
  {
   line = new Line[length - 1];
   isNewLine = true;
  }
  else
  {
   line = new Line[length];
   
  }
  //Debug.Log("ls长度" + ls.Length);
  for (int i = 0; i < line.Length; i++)
  {
   if (i == 0 && line.Length == 1&&isNewLine==false)//解决单行时没有换行符的情况
   {
    line[i] = new Line(0, ls[i].Length * 6);
    break;
   }
   if (i == 0&&line.Length>=1)//解决单行时有换行符的情况，以及多行时i为0的情况
   {
    line[i] = new Line(0, (ls[i].Length+1) * 6);
   }
   else
   {
    if (i < line.Length - 1)
    {
     line[i] = new Line(line[i - 1].EndVertexIndex + 1, (ls[i].Length + 1) * 6);
    }
    else
    {
     if (isNewLine == true)//解决多行时，最后一行末尾有换行符的情况
     {
      line[i] = new Line(line[i - 1].EndVertexIndex + 1, (ls[i].Length + 1) * 6);
     }
     else
     {
      line[i] = new Line(line[i - 1].EndVertexIndex + 1, ls[i].Length * 6);
     }
    }
   }
  }

  
  List<UIVertex> vertexs = new List<UIVertex>();
  vh.GetUIVertexStream(vertexs);
  int countVertexIndex = vertexs.Count;
  //Debug.Log("顶点总量" + vertexs.Count);
  for (int i = 0; i < line.Length; i++)
  {
   if (line[i].CountVertexIndex == 6) { continue; }
   for (int k = line[i].StartVertexIndex+6; k <= line[i].EndVertexIndex; k++)
   {
    UIVertex vertex = vertexs[k]; 
    vertex.position += new Vector3(spacing * ((k-line[i].StartVertexIndex) / 6), 0, 0);
    //Debug.Log("执行");
    vertexs[k] = vertex;
    if (k % 6 <= 2)
    {
     vh.SetUIVertex(vertex, (k / 6) * 4 + k % 6);
    }
    if (k % 6 == 4)
    {
     vh.SetUIVertex(vertex, (k / 6) * 4 + k % 6 - 1);
    }
   }

  }


 }
}