unity原生的Text文字的顏色雖是可調但是隻能是單一顏色，不能達到顏色的漸變效果。

下面我就貼程式碼了：

兩色漸變

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

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

    
        public Color colorTop = Color.red;
        public Color colorBottom = Color.green;

        protected TextVerticalGradientTwoColor()
        {

        }

        private static void setColor(List<UIVertex> verts, int index, Color32 c)
        {
            UIVertex vertex = verts[index];
            vertex.color = c;
            verts[index] = vertex;
        }

        private void ModifyVertices(List<UIVertex> verts)
        {
            for (int i = 0; i < verts.Count; i += 6)
            {
                setColor(verts, i + 0, colorTop);
                setColor(verts, i + 1, colorTop);
                setColor(verts, i + 2, colorBottom);
                setColor(verts, i + 3, colorBottom);

                setColor(verts, i + 4, colorBottom);
                setColor(verts, i + 5, colorTop);
            }
        }

        #region implemented abstract members of BaseMeshEffect

        public override void ModifyMesh(VertexHelper vh)
        {
            if (!this.IsActive())
            {
                return;
            }
            List<UIVertex> verts = new List<UIVertex>(vh.currentVertCount);
            vh.GetUIVertexStream(verts);

            ModifyVertices(verts);

            vh.Clear();
            vh.AddUIVertexTriangleStream(verts);
        }

        #endregion
}
 

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

namespace UI.Extension
{
    [AddComponentMenu ("UI/Effects/Text Vertical Gradient Color")]
    [RequireComponent(typeof(Text))]
    public class TextVerticalGradientThreeColor : BaseMeshEffect
    {
        public Color colorTop = Color.red;
        public Color colorCenter = Color.blue;
        public Color colorBottom = Color.green;

        public bool MultiplyTextColor = false;

        protected TextVerticalGradientThreeColor()
        {

        }

        public static Color32 Multiply(Color32 a, Color32 b)
        {
            a.r = (byte)((a.r * b.r) >> 8);
            a.g = (byte)((a.g * b.g) >> 8);
            a.b = (byte)((a.b * b.b) >> 8);
            a.a = (byte)((a.a * b.a) >> 8);
            return a;
        }

        private void ModifyVertices(VertexHelper vh)
        {
            List<UIVertex> verts = new List<UIVertex>(vh.currentVertCount);
            vh.GetUIVertexStream(verts);
            vh.Clear();

            int step = 6;

            for (int i = 0; i < verts.Count; i += step) {
                //6 point
                var tl = multiplyColor(verts[i+0], colorTop);
                var tr = multiplyColor (verts [i+1], colorTop);
                var bl = multiplyColor (verts [i+4], colorBottom);
                var br = multiplyColor (verts [i + 3], colorBottom);
                var cl = calcCenterVertex(verts[i+0], verts [i+4]);
                var cr = calcCenterVertex (verts [i+1], verts [i+2]);

                vh.AddVert (tl);
                vh.AddVert (tr);
                vh.AddVert (cr);
                vh.AddVert (cr);
                vh.AddVert (cl);
                vh.AddVert (tl);

                vh.AddVert (cl);
                vh.AddVert (cr);
                vh.AddVert (br);
                vh.AddVert (br);
                vh.AddVert (bl);
                vh.AddVert (cl);
            }

            for (int i = 0; i < vh.currentVertCount; i += 12) {
                vh.AddTriangle (i + 0, i + 1, i + 2);
                vh.AddTriangle (i + 3, i + 4, i + 5);
                vh.AddTriangle (i + 6, i + 7, i + 8);
                vh.AddTriangle (i + 9, i + 10, i + 11);
            }
        }

        private UIVertex multiplyColor(UIVertex vertex, Color color)
        {
            if (MultiplyTextColor)
                vertex.color = Multiply (vertex.color, color);
            else
                vertex.color = color;
            return vertex;
        }

        private UIVertex calcCenterVertex(UIVertex top, UIVertex bottom)
        {
            UIVertex center;
            center.normal = (top.normal + bottom.normal) / 2;
            center.position = (top.position + bottom.position) / 2;
            center.tangent = (top.tangent + bottom.tangent) / 2;
            center.uv0 = (top.uv0 + bottom.uv0) / 2;
            center.uv1 = (top.uv1 + bottom.uv1) / 2;

            if (MultiplyTextColor) {
                //multiply color
                var color = Color.Lerp(top.color, bottom.color, 0.5f);
                center.color = Multiply (color, colorCenter);
            } else {
                center.color = colorCenter;
            }

            return center;
        }

        #region implemented abstract members of BaseMeshEffect

        public override void ModifyMesh(VertexHelper vh)
        {
            if(!this.IsActive())
            {
                return;
            }


            ModifyVertices(vh);
        }

        #endregion
    }
}