OnMouseDown（）不使用unity 5.5.3f1

Question

这里我有一些代码，我试图用OnMouseDown()函数拖动对象。我尝试下面的代码但是没有用。我有2Dcircle collider的2D对象。这个2D圆形对撞机无法检测OnMouseDown()。如果没有在其他屏幕/摄像机屏幕上点击对象，我想检测鼠标点击。

这是我的小代码。

public  void OnMouseDown()
    {
        spring.enabled = false;
        clickedOn = true;
        Debug.Log (this.gameObject.name + " get down.");
    }

    public  void OnMouseUp()
    {
        spring.enabled = false;
        rgb2d.isKinematic = false;
        clickedOn = false;
        Debug.Log (this.gameObject.name + " get up.");
    }

此链接也无效Link

public void OnPointerDown(PointerEventData eventData)
    {
        spring.enabled = false;
        clickedOn = true;
        Debug.Log (this.gameObject.name + " Was Clicked.");
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        spring.enabled = false;
        rgb2d.isKinematic = false;
        clickedOn = false;
        Debug.Log (this.gameObject.name + " Was Clicked.");
    }