Unity 2017 文字颜色渐变

 1 using System.Collections;
 2 using System.Collections.Generic;
 3 using UnityEngine;
 4 using UnityEngine.UI;
 5 
 6 [AddComponentMenu("UI/Effects/GradientText")]
 7 public class GradientText : BaseMeshEffect
 8 {
 9     [SerializeField]
10     private Color32 topColor = Color.white;
11 
12     [SerializeField]
13     private Color32 bottomColor = Color.black;
14 
15     public override void ModifyMesh(VertexHelper vh)
16     {
17         if (!IsActive() || vh.currentVertCount == 0)
18             return;
19         List<UIVertex> vertices =  new List<UIVertex>();
20         vh.GetUIVertexStream(vertices);
21         float bottomY = vertices[0].position.y;
22         float topY = vertices[0].position.y;
23         for (int i = 1; i < vertices.Count; i++ )
24         {
25            if( vertices[i].position.y > topY) {
26                 topY = vertices[i].position.y;
27             }
28             else if (vertices[i].position.y < bottomY)
29             {
30                 bottomY = vertices[i].position.y;
31             }
32         }
33         float uiElementHeight = topY- bottomY;
34         UIVertex v = new UIVertex();
35         for (int i = 0; i<vh.currentVertCount; i++)
36         {
37         vh.PopulateUIVertex(ref v, i);
38         v.color = Color32.Lerp(bottomColor, topColor, (v.position.y - bottomY) / uiElementHeight);
39         vh.SetUIVertex(v, i);
40         }
41     }
42 }