show view at center programatically swift code example

Example 1: how to set the center in view in swift

childView.center = parentView.center

Example 2: how to set the center in view in swift

childView.centerXAnchor.constraint(equalTo: parentView.centerXAnchor).isActive = true
childView.centerYAnchor.constraint(equalTo: parentView.centerYAnchor).isActive = true