//方式一，使用API获取        var rtrans = gameObject.GetComponent
     
      ();        Vector3[] worldcorners = new Vector3[4];        rtrans.GetWorldCorners(worldcorners);        //方式二，手动计算        var cam = GameObject.Find("Camera").GetComponent
      
       ();        var cam_h = 2 * cam.orthographicSize;        var cam_w = cam_h * Screen.width / Screen.height;        var canvasObj = GameObject.Find("Canvas");        var canvas = canvasObj.GetComponent
       
        ();        var canvasScaler = canvasObj.GetComponent
        
         ();        float screen_w = Screen.width;        float screen_h = Screen.height;        var pos = transform.position;        var fw = rtrans.rect.width;        var fh = rtrans.rect.height;        if (canvasScaler.uiScaleMode == CanvasScaler.ScaleMode.ScaleWithScreenSize)        {            screen_w = canvasScaler.referenceResolution.x;            screen_h = screen_w * Screen.height / Screen.width;        }        if (canvas.renderMode == RenderMode.ScreenSpaceCamera)        {            fw = rtrans.rect.width / screen_w * cam_w;            fh = rtrans.rect.height / screen_h * cam_h;        }        float[] wcs = new float[4];        var c1 = pos.x - fw / 2;        var c2 = pos.x + fw / 2;        var c3 = pos.y - fh / 2;        var c4 = pos.y + fh / 2;        //两种试计算得到的结果完全一样