Unity3D轮转图（有回正效果）

注意：Main Camera 需要挂载Physics RayCaster

           Hierarchy中添加UI里面的EventSystem对象（用来相应拖拽事件）

using DG.Tweening;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using System.Linq;

public class Rotate3D : MonoBehaviour, IDragHandler, IEndDragHandler
{
    //生成的数量
    int count = 5;
    //半径
    public int r = 3;
    //需要旋转的弧度
    float movehu = 0;
    //对象集合
    List<GameObject> gameObjects = new List<GameObject>();
    //排序集合
    List<Transform> transforms = new List<Transform>();
    //每个角的弧度
    float hu;
    // Start is called before the first frame update
    void Start()
    {
        hu = 2 * Mathf.PI / count;
        //初始化加载每个预制体到对应位置
        CreateCube();
        //默认加载第一个
        ChoseNumber(0);
    }

    private void HandleDragUpdated(float offset)
    {
        movehu = offset;
        CreateCube();

    }
    //指定去某个位置
    private void ChoseNumber(int n)
    {
        transforms = transforms.OrderBy(x => x.position.z).ToList();
        int index = gameObjects.IndexOf(transforms[0].gameObject);
        int next = index - n;
        int anext = count - Mathf.Abs(next);
        anext = next < 0 ? anext : -anext;
        float nextMove = (Mathf.Abs(next) < Mathf.Abs(anext) ? next : anext) * hu;
        float nextAng = Mathf.Asin(transforms[0].position.x / r) + nextMove;
        DT.To((c) =>
        {
            movehu = c;
            CreateCube();
        }, movehu, movehu + nextAng, Mathf.Abs(nextAng));
    }

    private void CreateCube()
    {
        for (int i = 0; i < count; i++)
        {
            if (gameObjects.Count <= i)
            {
                //加载需要加载的预制体
                GameObject obj = GameObject.Instantiate(Resources.Load<GameObject>("player/player_" + i), transform);
                obj.transform.Rotate(Vector3.up * 180);
                gameObjects.Add(obj);
                transforms.Add(gameObjects[i].transform);
            }
            float x = Mathf.Sin(hu * i + movehu) * r;
            float y = Mathf.Cos(hu * i + movehu) * r;
            gameObjects[i].transform.position = new Vector3(x, 0, y);
        }
    }

    public void OnDrag(PointerEventData eventData)
    {
        var dis = eventData.delta.x / (r * 100);
        movehu -= dis;//控制方向
        CreateCube();
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        var dis = eventData.delta.x / 100;
        DT.To((a) =>
        {
            movehu -= a / r;
            CreateCube();
        }, dis, 0, Mathf.Abs(dis / r)).OnComplete(() =>
        {
            transforms = transforms.OrderBy(x => x.position.z).ToList();
            float zhenghu = Mathf.Asin(transforms[0].position.x / r);
            DT.To((b) =>
            {
                movehu = b;
                CreateCube();
            }, movehu, movehu + zhenghu, 1);
        });
    }
}

DO.To() 方法参考我作品中的Unity手写模拟DoTween中的To功能 也可以直接使用DoTween包