NGUI实现滑动屏幕的时候，进行环形旋转

在滑动屏幕的时候，上图中的内容饶圆中心旋转，并且箭头的方向保持不变

每个Item上挂载的脚本:

 using UnityEngine;

 public class ItemTest : MonoBehaviour
 {
     void Update()
     {
         transform.eulerAngles = Vector3.zero;
     }
 }

父结点上挂载的脚本:

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

 public class lgs : MonoBehaviour
 {
     [SerializeField]
     ItemTest[] itemArray;
     [SerializeField]
     Vector3 centerPos;
     [SerializeField]
     float radius;

     Vector3[] posArray;
     void Start()
     {
         UIEventListener.Get(gameObject).onDrag = Drag;
         InitPosFromCircularRing(out posArray, centerPos, itemArray.Length, radius);
         for (int i = , iMax = itemArray.Length; i < iMax; i++)
         {
             itemArray[i].transform.localPosition = posArray[i];
         }
     }

     float tmpVal = ;
     void Drag(GameObject go, Vector2 vec2)
     {
         tmpVal += vec2.y >  ?  : -;
         transform.localEulerAngles = new Vector3(, , tmpVal);
     }

     void InitPosFromCircularRing(out Vector3[] posArray, Vector3 centerPos, int count, float radius)
     {
         posArray = new Vector3[count];
         float copies = (360.0f / count) * Mathf.Deg2Rad;
         for (int i = , j = count; i < j; ++i)
         {
             float x = radius * Mathf.Cos(copies * i);
             //float y = centerPos.y;
             float z = radius * Mathf.Sin(copies * i);
             Vector3 vec3 = new Vector3(x, z, ) + centerPos;
             posArray[i] = vec3;
         }
     }
 }