我需要在长按后更改leftBarButtonItem，我在TabBarController中设置了leftBarButtonItem，并在UsersController中设置了长按操作，如何才能做到这一点？
选项卡栏控制器：

class TabViewController: TabmanViewController {

private var viewControllers = [ DashboardController(),ClientsController(), UsersController() ]
var viewModel = TabBarViewModel()
var coordinator: TabBarCoordinator?

override func viewDidLoad() {
    super.viewDidLoad()
    self.title = "Dashboard"
    
    let rightItem = UIImage(named: "userIcon")
    let leftItem = UIImage(named: "backMenuButton")
    
    let rightButton = UIBarButtonItem(image: rightItem, style: .done, target: self, action: #selector(rightAction))
    let leftButton = UIBarButtonItem(image: leftItem, style: .done, target: self, action: #selector(leftAction))
    self.navigationItem.rightBarButtonItem = rightButton
    self.navigationItem.leftBarButtonItem = leftButton

用户控制器长按：

@objc func handleLongPress(longPressGesture: UILongPressGestureRecognizer) {      
    let longPress = longPressGesture.location(in: self.usersTableView)
    usersTableView.allowsMultipleSelection = true
    let indexPath = self.usersTableView.indexPathForRow(at: longPress)
    
    UINotificationFeedbackGenerator().notificationOccurred(.success)        
    
    if indexPath == nil {
        print("Long press on table view, not row.")
        
    }
    else if (longPressGesture.state == UIGestureRecognizer.State.began) {
        print("Long press on row, at \(indexPath!.row)")
        
        if !previousIndexPath.isEmpty {
        }
    }
    
    if let selectedIndexPath = self.usersTableView.indexPathForSelectedRow {
        self.usersTableView.deselectRow(at: selectedIndexPath, animated: true)
    }
    
    userLabel.text = "Select"
    usersNumber.text = "0"
    plusButton.isHidden = true
}