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 = 0, iMax = itemArray.Length; i < iMax; i++)
        {
            itemArray[i].transform.localPosition = posArray[i];
        }
    }

    float tmpVal = 0;
    void Drag(GameObject go, Vector2 vec2)
    {
        tmpVal += vec2.y > 0 ? 2 : -2;
        transform.localEulerAngles = new Vector3(0, 0, 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 = 0, 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, 0) + centerPos;
            posArray[i] = vec3;
        }
    }
}