Change MDCTextField Outlined text fields' active border color

this is a solution and work for me

let textField = MDCOutlinedTextField(frame: .zero)

textField.setOutlineColor( .black, for: .editing)
textField.setOutlineColor( .red , for: .disabled)
textField.setOutlineColor( .red , for: .normal)

Have you already tried?

let controller = MDCTextInputControllerOutlined(textInput: textInput)
controller.borderStrokeColor = .black