如何在Swift（iOS 14.4）中自定义Backburbuttonim的操作
我的应用程序有一个如何在Swift（iOS 14.4）中自定义Backburbuttonim的操作,ios,swift,uinavigationcontroller,ios14,backbarbuttonitem,Ios,Swift,Uinavigationcontroller,Ios14,Backbarbuttonitem,我的应用程序有一个UINavigationController作为初始视图控制器，而RootViewControler作为UINavigationController的根视图控制器 然后我创建了FirstViewController和SecondViewController，这样我们就可以从RootViewController导航到FirstViewController，然后再导航到SecondViewController 问题在于如何自定义导航栏上的BackbarButtonim的操作。默认的
UINavigationControllerRootViewControlerUINavigationControllerFirstViewControllerSecondViewControllerRootViewControllerFirstViewControllerSecondViewControllerBackbarButtonimbackButtonItemviewdiloadRootViewControllerFirstViewControllerSecondViewControlleroverride func viewDidLoad() {
super.viewDidLoad()
navigationItem.backBarButtonItem = UIBarButtonItem(title: "Hello", style: .plain, target: self, action: #selector(backButtonTapped))
}