Change padding keyboard will show

[inflamesonly]

I need to change the position of the keyboard when the keyboard is open. For example, in the closed state padding = 0 and in the open state padding = 20

i do this
subviewInputBar.padding = UIEdgeInsets(top: 0, left: 0, bottom: isOpen ? 20 : 0, right: 0)

through the breakpoints I see that the constraints are changing, but visually nothing happens.