Resolved Get element's center position

In uGUI we could center element's pivot and when calling

transform.localPosition

we'd get the correct position, how to do it in UITK?

transform.position

returns position at upper left corner (and I haven't changed Pivot Origin).

 

I thought I could add a child which is placed at the center of parent and read its position, but its

transform.position

returns (0, 0) =(

 

Alright, I searched the forum some more and found that it can be achieved using

worldBound.center

, it was NaN when I wanted to use it, so I waited until layout was calculated using

element.RegisterCallback<GeometryChangedEvent>