如何在特定标签栏项而不是其他项下添加标题

Posted 2023-03-22

【中文标题】如何在特定标签栏项而不是其他项下添加标题

【英文标题】：How to add a Title under a Specific Tabbar Item and not others

【发布时间】：2018-10-07 20:07:19

【问题描述】：

我有一个 tabBar 控制器并且项目没有文本，我关注了this answer to do it

我只想给中间的tabBarItem添加文字，应该怎么添加？

class MainTabBarController: UITabBarController, UITabBarControllerDelegate 


override func viewDidLoad() 
    super.viewDidLoad()

    delegate = self

    configureTabs()


override func viewDidLayoutSubviews() 

    var verticalOffset: CGFloat = 6.0

    if #available(ios 11.0, *), traitCollection.horizontalSizeClass == .regular 
        verticalOffset = 0.0
    

    let imageInset = UIEdgeInsets(
        top: verticalOffset,
        left: 0.0,
        bottom: -verticalOffset,
        right: 0.0
    )

    for tabBarItem in tabBar.items ?? [] 
        tabBarItem.title = ""
        tabBarItem.imageInsets = imageInset
    


fileprivate func configureTabs() 

    let homeContainerVC = HomeContainerController()
    let navVCZero = UINavigationController(rootViewController: homeContainerVC)
    navVCZero.tabBarItem = UITabBarItem(title: nil, image: UIImage(named: "homeIcon"), tag: 0)

    let discoverVC = PopularDiscoverContainerController()
    let navVCOne = UINavigationController(rootViewController: discoverVC)
    navVCOne.tabBarItem = UITabBarItem(title: nil, image: UIImage(named: "discoverIcon"), tag: 1)

    let cameraVC = CameraController()
    cameraVC.tabBarItem = UITabBarItem(title: "Post Something", image: UIImage(named: "cameraIcon"), tag: 2)

    let notifcationsVC = NotifcationsController()
    let navVCThree = UINavigationController(rootViewController: notifcationsVC)
    navVCThree.tabBarItem = UITabBarItem(title: nil, image: UIImage(named: "notificationsIcon"), tag: 3)

    let settingsVC = SettingsController()
    let navVCFour = UINavigationController(rootViewController: settingsVC)
    navVCFour.tabBarItem = UITabBarItem(title: nil, image: UIImage(named: "settingsIcon"), tag: 4)

    viewControllers = [navVCZero, navVCOne, cameraVC, navVCThree, navVCFour]


//MARK:- TabBarController Delegate
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool 

    // this makes sure it's the vc you want to present modally from the tab index
    if viewController is CameraController 

        UIApplication.shared.statusBarView?.backgroundColor = UIColor.clear
        let cameraVC = CameraController()
        let navVC = UINavigationController(rootViewController: cameraVC)
        navVC.modalPresentationStyle = .fullScreen
        navVC.modalPresentationCapturesStatusBarAppearance = true
        tabBarController.present(navVC, animated: true, completion: nil)

        // return false to have the tab present it
        return false
    

    // return true to go back to the tab you was initially on before you pressed it
    return true

应用代理：

class AppDelegate: UIResponder, UIApplicationDelegate 

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool 

        UITabBar.appearance().tintColor = UIColor.black
        UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.font: UIFont.systemFont(ofSize: 11)], for: .normal)
    

【参考方案1】：

我得到了答案。在 viewDidLayoutSubviews 我只需要添加：

for tabBarItem in tabBar.items ?? [] 
    if tabBarItem.tag != 2 
        tabBarItem.title = ""
        tabBarItem.imageInsets = imageInset