TabBar 和 NavigationBar 不改变颜色答案

【问题标题】：TabBar and NavigationBar do not change colorsTabBar 和 NavigationBar 不改变颜色
【发布时间】：2022-11-03 20:32:18
【问题描述】：

我在运行 xcode 14 和 ios 16 时遇到了一些问题。

导航栏不变色，Tab Bar 与背景颜色相同（我认为应该有不同的色调）。

class MainTabController: UITabBarController {
    
    // MARK: - Properties
    
    // MARK: - Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
        
        configureViewControllers()
    }
    
    // MARK: - Helpers
    func configureViewControllers() {
        let feed = FeedController()
        let nav1 = templateNavigationController(image: UIImage(named: "home_unselected"), rootViewController: feed)
        
        let explore = ExploreController()
        let nav2 = templateNavigationController(image: UIImage(named: "search_unselected"), rootViewController: explore)
        
        let notifications = NotificationsController()
        let nav3 = templateNavigationController(image: UIImage(named: "search_unselected"), rootViewController: notifications)
        
        let conversations = ConversationsController()
        let nav4 = templateNavigationController(image: UIImage(named: "search_unselected"), rootViewController: conversations)
        
        viewControllers = [nav1, nav2, nav3, nav4]
    }
    
    func templateNavigationController(image: UIImage?, rootViewController: UIViewController) -> UINavigationController {
        
        let nav = UINavigationController(rootViewController: rootViewController)
        nav.tabBarItem.image = image
        nav.navigationBar.barTintColor = .white
        
        return nav
    }
}

我试过设置导航栏的外观：

        let appearance = UINavigationBarAppearance()
        appearance.configureWithOpaqueBackground()
        appearance.backgroundColor = .white
        nav.navigationBar.standardAppearance = appearance
        nav.navigationBar.scrollEdgeAppearance = nav.navigationBar.standardAppearance

这似乎有点多余，您是否必须每次为每个导航控制器都这样做？

【问题讨论】：

标签： ios swift uinavigationcontroller uikit uitabbarcontroller

【解决方案1】：

不，您不必为每个导航控制器执行此操作。

您可以扩展UINavigationBar。

extension UINavigationBar {
    
    static func create() {
        let navBarAppearance = UINavigationBarAppearance()
        navBarAppearance.configureWithOpaqueBackground()
        navBarAppearance.backgroundColor = .white
        appearance().standardAppearance = navBarAppearance
        appearance().scrollEdgeAppearance = navBarAppearance
        appearance().compactAppearance = navBarAppearance
    }
}

并从您的application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool 拨打UINavigationBar.create()

【讨论】：