unity3d 实现帧序列精灵动画

<pre name="code" class="csharp">using UnityEngine;
using System.Collections;
//现只适用 一行一列精灵图
public class SpriteAni : MonoBehaviour {

	public float timer = 0; //切换下一帧 计时器
	public float frameNumber = 30;//每秒多少帧
	public int frameCounts = 3; //总帧

	public int currentFrameIndex = 0; //当前帧
	public float frameIndexOffsetX = 0.33333f; //== Tilling x  1/frameCounts动画总数
	public float frameIndexOffsetY = 0.0f; //== Tilling y

	private float currentFrameOffsetX = 0.0f;
	private float currentFrameOffsetY = 0.0f;
	// Use this for initialization
	void Start () {
	}
	// Update is called once per frame
	void Update () {
		timer += Time.deltaTime;
		if(timer >= 1.0f/frameNumber)
		{
			currentFrameIndex ++;
			timer -= 1.0f/frameNumber;
			currentFrameIndex = currentFrameIndex%frameCounts;
			currentFrameOffsetX = frameIndexOffsetX*currentFrameIndex;
			currentFrameOffsetY = frameIndexOffsetY*currentFrameIndex;
			this.renderer.material.SetTextureOffset("_MainTex", new Vector2(currentFrameOffsetX,currentFrameOffsetY));
		}

	}
}