public static void ScrollChildInView(this ScrollRect sr, GameObject child, Rect viewRect)
 {
     if (sr && child)
     {
         sr.ScrollChildInView((RectTransform)child.transform, viewRect);
     }
 }
 public static void ScrollChildInView(this ScrollRect sr, RectTransform childRtx, Rect viewRect)
 {
     if (sr && childRtx)
     {
         sr.ScrollChildInView(childRtx.position, childRtx.rect.size, childRtx.pivot, viewRect);
     }
 }