效果预览

视频：

运行环境

Unity 4.5, NGUI3.5, iTween

场景搭建

创建一个UIPanel，UIPanel下再创建一个UISprite，UIPanel选择SoftClip,然后给Panel绑定上PanelController.cs，拷贝4份。结构如下图

MaskManager

给UIRoot绑定PanelController.cs，Targets绑定上面创建的四个Panel，点击Play ，按数字键 0，1，2，3，4 切换效果

MaskManager代码

using UnityEngine;using System.Collections;using System.Collections.Generic;public class MaskManager : MonoBehaviour {    public GameObject[] Targets;    private List
    
      clipList;    private float sw = 1024f;    private float sh = 576f;    // Use this for initialization    void Start () {        clipList = new List
     
      ();        foreach(var target in Targets) {            clipList.Add(target.AddComponent
      
       ());        }        Init();    }        // Update is called once per frame    void Update () {        if(Input.GetKeyDown(KeyCode.Alpha1)) {            ShowFullImage(0);        } else if(Input.GetKeyDown(KeyCode.Alpha2)) {            ShowFullImage(1);        } else if(Input.GetKeyDown(KeyCode.Alpha3)) {            ShowFullImage(2);        } else if(Input.GetKeyDown(KeyCode.Alpha4)) {            ShowFullImage(3);        } else if(Input.GetKeyDown(KeyCode.Alpha0)) {            Init();        }    }    void Init() {        for(int i=0; i
      
     
    

using UnityEngine;using System.Collections;public class PanelController : MonoBehaviour {    private UIPanel panel;    static private float animTime = 0.6f;    void Awake() {        panel = GetComponent
    
     ();    }    // Use this for initialization    void Start () {    }    // Update is called once per frame    void Update () {        }    public void SetDepth(int depth) {        panel.depth = depth;    }    public void UpdateSize(Vector2 size) {        var current = new Vector2(panel.baseClipRegion.z, panel.baseClipRegion.w);        iTween.ValueTo(gameObject, iTween.Hash("from", current, "to", size, "time", animTime, "onupdate", "OnUpdateSize"));    }    public void UpdateOffset(Vector2 offset) {        iTween.ValueTo(gameObject, iTween.Hash("from", panel.clipOffset, "to", offset, "time", animTime, "onupdate", "OnUpdateOffset"));    }        private void OnUpdateSize(Vector2 size) {        panel.baseClipRegion = new Vector4(0f, 0f, size.x, size.y);    }    private void OnUpdateOffset(Vector2 offset) {        panel.clipOffset = offset;    }}