recttransform left right top bottom in unity2d code example

Example: recttransform left right top bottom in unity2d

RectTransform rectTransform = gameObjectButton.GetComponent<RectTransform>();         rectTransform .SetInsetAndSizeFromParentEdge(RectTransform.Edge.Bottom, 0, 0);         rectTransform .SetInsetAndSizeFromParentEdge(RectTransform.Edge.Top, 0, 0);         rectTransform .SetInsetAndSizeFromParentEdge(RectTransform.Edge.Left, 0, 0);         rectTransform .SetInsetAndSizeFromParentEdge(RectTransform.Edge.Right, 0, 0);