项目中需要有一个scrollRect组件可以左右拖拽角色头像进行滚动，同时在长按角色头像的时候能移动角色头像与滚动列表下面的角色组进行交换，这就遇到了scrollrect与onDrag的组件冲突问题，这里做了一个解决办法

测试效果.gif

using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
/// <summary>
/// 脚本挂载到每个可拖拽的Item上面即可
/// </summary>
public class ItemOnDrag : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    // 实例化的新item
    public GameObject mNewItem;
    public Transform mNewItemRoot;
    public ScrollRect mScrollRect;
    // 是否按下
    public bool mIsDown = false;
    // 按下与松开鼠标之间的距离
    public float mBorderDis = 0.5f;
    // 总的按下时间
    public float mTotalTime = 1;
    private float mCurTime = 0;
    // 当前鼠标位置
    public Vector3 mCurPos;
    // 上一次鼠标位置
    public Vector3 mPrevPos;
    private NewItemOnDrag mNewDrag;

    void Update()
    {
        if (mIsDown)
        {
            mCurTime += Time.deltaTime * 1;
            if (mCurTime >= mTotalTime)
            {
                if (Vector3.Distance(mPrevPos, mCurPos) > mBorderDis)
                {
                    mCurTime = 0f;
                    return;
                }
                mCurTime = 0f;
                mIsDown = false;
                GameObject item = Instantiate(mNewItem);
                item.transform.SetParent(mNewItemRoot);
                item.transform.localScale = Vector3.one;
                mNewDrag = item.GetComponent<NewItemOnDrag>();
                if (mNewDrag == null)
                    mNewDrag = item.AddComponent<NewItemOnDrag>();
                item.transform.position = Input.mousePosition;
            }
        }
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        mNewDrag = null;
        mPrevPos = Input.mousePosition;
        mCurPos = Input.mousePosition;
        mIsDown = true;
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        mPrevPos = Vector3.zero;
        mCurPos = Vector3.zero;
        mIsDown = false;
        mNewDrag = null;
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        mScrollRect.OnBeginDrag(eventData);
    }

    public void OnDrag(PointerEventData eventData)
    {
        mCurPos = eventData.position;
        if (mNewDrag == null)
            mScrollRect.OnDrag(eventData);
        else
            mNewDrag.transform.position = Input.mousePosition;
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        mNewDrag = null;
        mScrollRect.OnEndDrag(eventData);
    }


}

这个脚本会自动挂载到新实例化出来的item上的，不要做处理，后期可加入检测

using UnityEngine;
using UnityEngine.EventSystems;

public class NewItemOnDrag : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    public void OnBeginDrag(PointerEventData eventData)
    {

    }

    public void OnDrag(PointerEventData eventData)
    {
        transform.position = Input.mousePosition;
    }

    public void OnEndDrag(PointerEventData eventData)
    {

    }
}

界面布局.png