在2D場景中,實現將框中的物體拖拽之符合條件的物體中;
應用場景:排序、物品欄、揹包等;
成果展示
Demo中實現的效果是畫面中存在4個圖片,需要按照喜好程度對圖片進行排序,將上面的1-2-3-4序號拖拽至對應的圖片旁邊。
Scene部分
其中Target中存放4張貓咪圖片,對應的Content中的1-2-3-4是下面的白色方框。
可以被拖拽的物體繫結元件 Canvas Group,這裡對應的是Id
指令碼部分
指令碼繫結在可以被拖拽的物體上
public class TargetArray : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler
{
[SerializeField] private Canvas canvas;
[SerializeField] private Transform Parent;
private RectTransform rectTrans;
private CanvasGroup canvasGroup;
Vector3 originalPosition;
Transform originalParent;
private void Start()
{
rectTrans = GetComponent<RectTransform>();
canvasGroup = GetComponent<CanvasGroup>();
}
public void OnBeginDrag(PointerEventData eventData)
{
originalPosition.z = 0;
originalPosition = transform.position;
originalParent = transform.parent;
canvasGroup.blocksRaycasts = false;
canvasGroup.alpha = 0.35f;
transform.SetParent(Parent);
}
public void OnDrag(PointerEventData eventData)
{
rectTrans.anchoredPosition += eventData.delta / canvas.scaleFactor;
}
public void OnEndDrag(PointerEventData eventData)
{
canvasGroup.blocksRaycasts = true;
canvasGroup.alpha = 1f;
GameObject itemSlot = eventData.pointerCurrentRaycast.gameObject;
if (itemSlot != null && itemSlot.CompareTag("slot") && (itemSlot.transform.childCount ==0))
{
transform.SetParent(itemSlot.transform);
transform.position = itemSlot.transform.position;
}
else
{
transform.position = originalPosition;
transform.SetParent(originalParent);
}
}
}