AppDelegate 和 TabBarViewController

Question

我编写了如下所述的代码。

AppDelegate.swift

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

    UITabBarItem.appearance().setTitleTextAttributes([.font: UIFont.systemFont(ofSize: 9, weight: .bold), .foregroundColor: UIColor.init(red: 50/255, green: 50/255, blue: 50/255, alpha: 1)], for: .normal)

    return true
}

然后，我移至一个选项卡上的另一个 Viewcontoller 屏幕。 同时，我按照描述的方式编写了代码：

nav.modalPresentationStyle = .fullScreen

然后，我关闭 ViewContoroller 屏幕。 然后，其他选项卡文本颜色已更改默认颜色（蓝色）。 为什么是这样？

该问题可以通过编写如下所述的代码来解决：

TabBarViewController.swift

override func viewWillAppear(_ animated: Bool) {
    let color = UIColor.init(red: 50/255, green: 50/255, blue: 50/255, alpha: 1)
    UITabBarItem.appearance().setTitleTextAttributes([.font: UIFont.systemFont(ofSize: 9, weight: .bold), .foregroundColor: color], for: .normal)
    tabBar.tintColor = color
}

我分享了一个关于这个问题的视频，以便清楚地解释你。 如果可以的话，请检查一下。

https://streamable.com/z9d1j5

Answer 1

您没有像这样配置选定的颜色：

UITabBarItem.appearance().setTitleTextAttributes([.font: UIFont.systemFont(ofSize: 9, weight: .bold), .foregroundColor: yourcolor], for: .selected)

编辑：

如果您在 iOS 13+ 上运行，您应该像这样配置 UITabBarAppearence：

 let tabBarItemAppearence = UITabBarItemAppearance()
 tabBarItemAppearence.normal.iconColor = UIColor.yourcolor
 tabBarItemAppearence.selected.iconColor = UIColor.yourcolor
            
 tabBarItemAppearence.normal.titleTextAttributes = [.foregroundColor: UIColor.yourcolor]
 tabBarItemAppearence.selected.titleTextAttributes = [.foregroundColor: UIColor.yourcolor]

 let tabBarAppearence = UITabBarAppearance()
 tabBarAppearence.inlineLayoutAppearance = tabBarItemAppearence
 tabBarAppearence.compactInlineLayoutAppearance = tabBarItemAppearence
 tabBarAppearence.stackedLayoutAppearance = tabBarItemAppearence
 tabBarAppearence.backgroundColor = color

然后像这样设置外观

tabBarController.tabBar.standardAppearance = tabBarAppearence