Unity UGUI控制text文字间距

[RequireComponent(typeof(Text))]
public class Spacing : BaseMeshEffect
{
}

[SerializeField]
 private float spacing_x;
 [SerializeField]
 private float spacing_y;
 
private List<UIVertex> mVertexList;

public override void ModifyMesh(VertexHelper vh)
  {
    if(spacing_x == 0 && spacing_y == 0) { return; }
    if (!IsActive()) { return; }
    int count = vh.currentVertCount;
    if (count == 0) { return; }
    if (mVertexList == null) { mVertexList = new List<UIVertex>(); }
    vh.GetUIVertexStream(mVertexList);
    int row = 1;
    int column = 2;
    List<UIVertex> sub_vertexs = mVertexList.GetRange(0, 6);
    float min_row_left = sub_vertexs.Min(v => v.position.x);
    int vertex_count = mVertexList.Count;
    for (int i = 6; i < vertex_count;)
    {
      if (i % 6 == 0)
      {
        sub_vertexs = mVertexList.GetRange(i, 6);
        float tem_row_left = sub_vertexs.Min(v => v.position.x);
        if (tem_row_left <= min_row_left)
        {
          min_row_left = tem_row_left;
          ++row;
          column = 1;
          //continue;
        }
      }
      for(int j=0;j<6;j++)
      {
        UIVertex vertex = mVertexList[i];
        vertex.position += Vector3.right * (column - 1) * spacing_x;
        vertex.position += Vector3.down * (row - 1) * spacing_y;
        mVertexList[i] = vertex;
        ++i;
      }
      ++column;
    }
    vh.Clear();
    vh.AddUIVertexTriangleStream(mVertexList);
  }