在Unity中使用Touch拖动和交换两个对象

using UnityEngine;

public class ObjectDragAndSwap : MonoBehaviour
{
    private bool isDragging = false;
    private Vector3 startPosition;
    private Transform startParent;

    void Update()
    {
        if (Input.touchCount > 0)
        {
            Touch touch = Input.GetTouch(0);

            switch (touch.phase)
            {
                case TouchPhase.Began:
                    if (IsTouchingObject(touch.position))
                    {
                        isDragging = true;
                        startPosition = transform.position;
                        startParent = transform.parent;
                    }
                    break;

                case TouchPhase.Moved:
                    if (isDragging)
                    {
                        Vector3 touchPosition = Camera.main.ScreenToWorldPoint(touch.position);
                        transform.position = new Vector3(touchPosition.x, touchPosition.y, transform.position.z);
                    }
                    break;

                case TouchPhase.Ended:
                    if (isDragging)
                    {
                        if (IsTouchingObject(touch.position))
                        {
                            SwapObjects(transform, GetTouchedObject(touch.position));
                        }
                        else
                        {
                            transform.position = startPosition;
                            transform.parent = startParent;
                        }

                        isDragging = false;
                    }
                    break;
            }
        }
    }

    private bool IsTouchingObject(Vector2 touchPosition)
    {
        RaycastHit2D hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(touchPosition), Vector2.zero);
        return hit.collider != null && hit.collider.gameObject == gameObject;
    }

    private Transform GetTouchedObject(Vector2 touchPosition)
    {
        RaycastHit2D hit = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(touchPosition), Vector2.zero);
        return hit.collider != null ? hit.collider.transform : null;
    }

    private void SwapObjects(Transform object1, Transform object2)
    {
        if (object1 != null && object2 != null)
        {
            Vector3 tempPosition = object1.position;
            Transform tempParent = object1.parent;

            object1.position = object2.position;
            object1.parent = object2.parent;

            object2.position = tempPosition;
            object2.parent = tempParent;
        }
    }
}