using System.Collections;

 using System.Collections.Generic;

 using UnityEngine;

 using UnityEngine.UI;

 using UnityEngine.EventSystems;

 public class MoveController : ScrollRect{

     float mMaxRadius;

     public bool ifmove;

     public Vector2 moveDelta = new Vector2();

     protected override void Start()

     {

         base.Start();

         //计算摇杆块的半径 = 摇杆的宽的一半

         mMaxRadius = content.sizeDelta.x * 0.5f;

     }

     //拖动时

     public override void OnDrag(UnityEngine.EventSystems.PointerEventData eventData)

     {

         base.OnDrag(eventData);

         var contentPostion = this.content.anchoredPosition;

         //如果超出摇杆范围

         if (contentPostion.magnitude > mMaxRadius)

         {

             contentPostion = contentPostion.normalized * mMaxRadius;

             SetContentAnchoredPosition(contentPostion);

         }

         //获取拖动的delta值 （-1<DeltaX<1，-1<DeltaY<1）

         moveDelta.x = contentPostion.x/ mMaxRadius;

         moveDelta.y = contentPostion.y/ mMaxRadius;

         //表示正在移动摇杆

         ifmove = true;

     }

     public void Update()

     {

         //,,,,,,,

         //可根据moveDelta值做某些事情

     }

     //当结束拖动时

     public override void OnEndDrag(PointerEventData eventData)

     {

         base.OnEndDrag(eventData);

         moveDelta.x = ;

         moveDelta.y = ;

         //表示停止移动摇杆

         ifmove = false;

         //重置位置

         SetContentAnchoredPosition(Vector3.zero);

     }

 }