NGUI图片闪光

先上效果

Shader

Shader "Unlit/Transparent Colored Flow Texture"
{
	Properties
	{
		_MainTex ("Base (RGB), Alpha (A)", 2D) = "black" {}
		_FlashTex("Flash (RGB), Alpha (A)", 2D) = "white" {}
		_FlashColor("Flash Color", Color) = (1,1,1,0)
		_Interval("Interval", Float) = 5

	}

	SubShader
	{
		LOD 200

		Tags
		{
			"Queue" = "Transparent"
			"IgnoreProjector" = "True"
			"RenderType" = "Transparent"
		}

		Pass
		{
			Cull Off
			Lighting Off
			ZWrite Off
			Fog { Mode Off }
			Offset -1, -1
			Blend SrcAlpha OneMinusSrcAlpha

			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"

			sampler2D _MainTex;
			float4 _MainTex_ST;
			sampler2D _FlashTex;
			float4 _FlashColor;
			float _Interval;

			struct appdata_t
			{
				float4 vertex : POSITION;
				float2 texcoord : TEXCOORD0;
				fixed4 color : COLOR;
			};

			struct v2f
			{
				float4 vertex : SV_POSITION;
				half2 texcoord : TEXCOORD0;
				half2 texcoord1 : TEXCOORD1;
				fixed4 color : COLOR;
			};

			v2f o;

			float mymod(float x, float y)
			{
			  return x - y * floor(x/y);
			}

			v2f vert (appdata_t v)
			{
				o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
				o.texcoord = v.texcoord;
				o.texcoord1 = o.texcoord;
				o.texcoord1.x += mymod(-_Time.w, _Interval) - 1.0f;
				o.color = v.color;
				return o;
			}

			fixed4 frag (v2f IN) : COLOR
			{
				float4 col = tex2D(_MainTex, IN.texcoord) * IN.color;				

            	float4 flashCol = tex2D(_FlashTex,IN.texcoord1)*_FlashColor;
				col.rgb = col.rgb + flashCol.rgb * flashCol.w;

                return col;
			}
			ENDCG
		}
	}

	SubShader
	{
		LOD 100

		Tags
		{
			"Queue" = "Transparent"
			"IgnoreProjector" = "True"
			"RenderType" = "Transparent"
		}

		Pass
		{
			Cull Off
			Lighting Off
			ZWrite Off
			Fog { Mode Off }
			Offset -1, -1
			ColorMask RGB
			Blend SrcAlpha OneMinusSrcAlpha
			ColorMaterial AmbientAndDiffuse

			SetTexture [_MainTex]
			{
				Combine Texture * Primary
			}
		}
	}
}

　　

　　

　　

脚本

using UnityEngine;
using System.Collections;

/*-------------------------------------------------------------------
Copyright 2015 Minty Game LTD. All Rights Reserved.
Maintained by  bailu
-------------------------------------------------------------------
bailu				2016-01-26 14:45:52
			带流光的UITexture
*/

[ExecuteInEditMode]
[RequireComponent(typeof(UITexture))]
public class UIFlowTexture : MonoBehaviour {

	//流光颜色
	[SerializeField]
	private Texture FlowTexture = null;

	//流光时间间隔
	[SerializeField]
	private float Interval = 5f;

	//流光颜色
	[SerializeField]
	private Color FlowColor = Color.white;

	//被流光的UITexture
	private UITexture mUITexture;

	void Awake()
	{
		mUITexture = gameObject.GetComponent<UITexture>();
	}

	// Use this for initialization
	void Start ()
	{
		ResourceManager.PrepareResource<Material>(Resource.Dir.Material + "UITexture_Flow.mat", material =>
		{
			mUITexture.material = new Material(material);
			RefreshMaterialProperty();
		});
	}

	[ContextMenu("Refresh Material Property")]
	public void RefreshMaterialProperty()
	{
		var mat = mUITexture.material;
		if(null==mat)
		{
			return;
		}

		if(null!=FlowTexture)
		{
			mat.SetTexture("_FlashTex", FlowTexture);
		}

		mat.SetFloat("_Interval", Interval);

		mUITexture.MarkAsChanged();
	}

}

　　

搞法：

1、创建个材质命名成UITexture_Flow.mat，把上面的shader拖拽进去。

2、创建GameObject，挂上UITexture(不用修改的材质，原因是我代码里会去修改他的材质。为什么总是new 新的材质，原因是每个UITexture都要自己流动自己的)

3、然后再挂上UITextureFlow，设置流光的参数

注意：如果你放ScrollView下发现裁剪不正确，那就按照NGUI的shader规则，增加XXX 1.shader，XXX 2.shader。