AppDelegate和TabBarViewController

如何解决AppDelegate和TabBarViewController

我写了如下代码。

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，我转到一个选项卡上的另一个Viewcontoller屏幕。同时，我按照描述的那样编写代码：

nav.modalPresentationStyle = .fullScreen

然后，关闭ViewContoroller屏幕。然后，其他选项卡文本颜色已更改为默认颜色（蓝色）。为什么会这样？

并且可以通过编写如下所述的代码来解决该问题：

TabBarViewController.swift

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

我分享了一个有关该问题的视频，以清楚地向您解释。请检查它。

https://streamable.com/z9d1j5

解决方法

您没有像这样配置所选颜色：

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，则应按以下方式配置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