问如何以编程方式更改标签？

EN

def application(application, didFinishLaunchingWithOptions:launchOptions)
  @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)

  tabs = [
    {
      systemIcon: UITabBarSystemItemContacts,
      navigationController: true,
      viewController: ContactsViewController
    }, {
      title: "Custom",
      icon: "custom.png",
      navigationController: false,
      viewController: CustomViewController.alloc.initWithCustomInit(true)
    }, {
      title: "Settings",
      icon: "settings.png",
      navigationController: true,
      viewController: SettingsViewController
    }
  ]

  tabBarController = MotionTab::TabBar.createTabBarControllerFromData(tabs)
  MotionTab::TabBar.select(tabBarController, title: "Settings")
  # MotionTab::TabBar.select(tabBarController, tag: 0) # Selects first tab

  @window.rootViewController = tabBarController
  @window.makeKeyAndVisible
end