Ios 如何以编程方式将按钮项添加到现有导航栏Xcode

我最近一直致力于以编程方式制作我的应用程序，但我遇到了一个错误，选项卡栏控制器也生成了一个导航控制器（我希望每个页面都有一个导航控制器），但是我正在努力找到一种方法，在栏上添加一个按钮，就像右上角的“完成”按钮一样，来自ViewController本身，而不是选项卡栏控制器

基本上，我正在尝试添加一个提交按钮，该按钮将执行ViewController中声明的操作，但是我发现的唯一方法是在每个视图控制器中单独创建导航控制器，这将降低效率，或者在选项卡栏控制器中添加按钮，但这将意味着复制该功能（特定于“视图控制器”页面上的其他项目）进入选项卡栏控制器，这将是一场噩梦

这是viewDidLoad函数中控制器-newReportScreen上的代码

        //setting the nav bar submit button
        let navBar = UINavigationBar()
        view.addSubview(navBar)
        let submitItem = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(SubmitButtonTouched))
        let navItem = UINavigationItem(title: "Submit")
        navItem.rightBarButtonItem = submitItem
        navBar.setItems([navItem], animated: false)

与TabBar控制器中的代码冲突

        //setting up the variable for the first view controller which will be used for the tab bar
        let firstViewController = MapVC()
        //set the nav title
        firstViewController.title = "Home"
        //initialising the first tab bar item, which will have the title of Home, the image named below and the tag number, showing the position on the bar
        firstViewController.tabBarItem = UITabBarItem(title: "Home", image: UIImage(named: "Home.png"), tag: 0)
        //initialising the second of the view controllers which will be used to access from the tab bar controller
        let secondViewController = localReportsTVC()
        //set the nav title
        secondViewController.title = "Local Reports"
        //setting the second view controller on the tab bar and giving it a title, image and location on the bar
        secondViewController.tabBarItem = UITabBarItem(title: "Local Reports", image: UIImage(named: "Local.png"), tag: 1)
        //setting up the third view controller to be referenced on the tab bar controller
        let thirdVC = NewReportScreen()
        //set the nav title
        thirdVC.title = "New Report"
        //setting the third view conteroller to be on the tab bar with the image, name and the location on the bar in relation to the other items
        thirdVC.tabBarItem = UITabBarItem(title: "New Report", image: UIImage(named: "Plus Icon.png"), tag: 2)
        //setting up the third view controller to be referenced in the tab bar controller
        let fourthVC = MyReportsTVC()
        //set the nav title
        fourthVC.title = "My Reports"
        //setting the third item on the tab bar up so that it has a position, image and title
        fourthVC.tabBarItem = UITabBarItem(title: "My Reports", image: UIImage(named: "MyReports.png"), tag: 3)
        //setting up the fifth section of the tab bar, where it will be referenced later
        let fithVC = SettingsScreen()
        //set the nav title
        fithVC.title = "Settings"
        //setting up the fifth item, so that it has a title, image and position on the bar
        fithVC.tabBarItem = UITabBarItem(title: "Settings", image: UIImage(named: "Settings Icon.png"), tag: 4)
        //initialising the final tab bar wih all of the elements from above
        let tabBarList = [firstViewController, secondViewController, thirdVC, fourthVC, fithVC]
        //setting the view controllers equal to the tab bar list defined above - also adding in the navigation controller to each of the tabs so that they have a title and also a navigation controller to add the back button in
        viewControllers = tabBarList.map { UINavigationController(rootViewController: $0)}

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我可能想得太多了，但我一直在努力解决这个问题，因此非常感谢您的帮助！

在创建UITabBar时，您已经添加了UINavigationController

viewControllers = tabBarList.map { UINavigationController(rootViewController: $0)}

这是正确的

然后，在每个视图控制器中，可以通过UIViewController

navigationItem

属性设置其导航栏项：

//setting the nav bar submit button
let submitItem = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(SubmitButtonTouched))
self.navigationItem.rightBarButtonItem = submitItem

在

viewDidLoad

中执行此操作是正确的