import BottomAction

...

@IBOutlet weak var bottomActionView: BottomActionView!

override func viewDidLoad() {
    super.viewDidLoad()

    self.prepareBottomAction()
}

private func prepareBottomAction() {
    self.bottomActionView.actionButton.isEnabled = false
    self.bottomActionView.actionButton.setTitle(self.isCreating ? "Add" : "Save", for: .normal)
    self.bottomActionView.actionClosure = { sender in
        self.onBottomActionTap(sender)
    }
}

private func onBottomActionTap(_ sender: UIControl?) {
    // TODO: Action logic
}