Unity3D 通用拖拽

UnityEngine.EventSystems.IDragHandler

public void OnDrag(PointerEventData eventData)
    {
        //仅仅适用于overlay模式
        //this.transform.position = eventData.position;

        //通用拖拽物体
        //将屏幕坐标转换为物体的世界坐标
        RectTransform parentRTF = this.transform.parent as RectTransform;
        Vector3 worldpos;
        //(父物体的变换组件,屏幕坐标,摄像机,out 世界坐标)
        RectTransformUtility.ScreenPointToWorldPointInRectangle(parentRTF, eventData.position, eventData.pressEventCamera, out worldpos);
        this.transform.position = worldpos;
    }