Unity UGUI 判斷是否點擊到UI，並且獲取當前點擊對象

public class Test: MonoBehaviour
{
    void Update()
    {
        if (Input.GetMouseButtonDown(0)) {
            if (EventSystem.current.IsPointerOverGameObject())
            {
                var clickObj = EventSystem.current.currentSelectedGameObject;
            }
        }
    }
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