Unity：在将UI元素拖到Onmouseup上的同时？

Question

In my 2D project I can't seem to get OnMouseUp working while dragging a UI object over it. I want to be able to detect that I dropped the UI object on a non-UI gameobject so I can activate the script that lets the position of the UI object be the same position as the non-UI object each Update.

Currenty I use the IOnDragHandler and IEndDragHandler on the UI object for the dragging process. When I want to drop the UI object on another UI object then IDropHandler helps me, but when I want to drop it on a non-UI GameObject, I want to be able to use the OnMouseUp event, but it doesn't fire.

Whenever I start dragging the object I use a CanvasGroup on the UI object and I make sure that it doesn't get hit by any raycasts.

I also tried making the collider of the non-UI object a trigger but it has no effect. Also, OnMouseOver and OnMouseExit do work when I am dragging the UI element over the non-UI element.

Thanks very much for looking into this. Here comes the code:

So on the UI object (A card) I use this:

   public void OnDrag(PointerEventData eventData)
    {
        if (CanDrag)
        {
            if (!isDragging)
            {
                isDragging = true;
                if (Slot != null)
                {
                    Slot.GetComponent<FamilyTreePlacementScript>().CurrentFamilyCard = null;
                }

                if (card is FamilyCard || card is EquipmentCard) UIManagerScript.Instance.ToggleFamilyTree(null, true);
                GetComponent<CanvasGroup>().blocksRaycasts = false;
                CardManagerScript.CardBeingDragged = gameObject;
                DataKeeperScript.Instance.MayDragCamera = false;
                CardManagerScript.Instance.DeletePreview();
                transform.SetParent(canvas);
            }

            transform.position = Input.mousePosition;
        }
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        if (CanDrag)
        {
            isDragging = false;
            GetComponent<CanvasGroup>().blocksRaycasts = true;
            CardManagerScript.CardBeingDragged = null;
            DataKeeperScript.Instance.MayDragCamera = true;

            if (Slot == null)
            {
                transform.SetParent(defaultParent);
            }
            else
            {
                Slot.GetComponent<FamilyTreePlacementScript>().CurrentFamilyCard = card as FamilyCard;
                transform.SetParent(Slot);
                transform.position = Slot.position;
            }
        }        
    }

And on the non-UI object that I want to "drop" the card on, I use:

private void OnMouseUp()
{
    if (CardManagerScript.CardBeingDragged)
    {
        Card card = CardManagerScript.CardBeingDragged.GetComponent<CardObjectScript>().card;

        if (card is TakeOverCard)
        {
            //Check if the card can actually be played

            if (Business.Allegiance != CardManagerScript.Instance.PlayerFamily)
            {
                CurrentTakeOverCard = card;
                CardManagerScript.CardBeingDragged.GetComponent<CardObjectScript>().SetWorldObject(transform);
            }
        }
    }
}

Answer 1

Check the 'Queries Hit Triggers' (Project Settings > Physics). It should be set to 'true'