UITabBarAppearance在iOS15 iPad上设置标题颜色不生效问题咨询

你仅配置了stackedLayoutAppearance样式，但iOS15及以上版本的iPad端，UITabBar默认使用inline布局，你未针对该布局配置样式，因此会显示系统默认的蓝色选中态与默认未选中态，不属于系统Bug，属于遗漏配置项。

你需要同时为inline布局、以及iOS15新增的scrollEdgeAppearance配置相同的样式规则，修改后代码如下：

class CustomViewController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let tabBarAppearnace = UITabBarAppearance()
        let tabFont =  UIFont.boldSystemFont(ofSize: 18)
        
        let selectedAttributes: [NSAttributedString.Key: Any]
        = [NSAttributedString.Key.font: tabFont, NSAttributedString.Key.foregroundColor: UIColor.orange]
        let normalAttributes: [NSAttributedString.Key: Any]
        = [NSAttributedString.Key.font: tabFont, NSAttributedString.Key.foregroundColor: UIColor.black]
        
        // 适配iPhone竖屏/小屏iPad的堆叠布局
        tabBarAppearnace.stackedLayoutAppearance.normal.titleTextAttributes = normalAttributes
        tabBarAppearnace.stackedLayoutAppearance.selected.titleTextAttributes = selectedAttributes
        
        // 新增：适配iPad默认的inline布局
        tabBarAppearnace.inlineLayoutAppearance.normal.titleTextAttributes = normalAttributes
        tabBarAppearnace.inlineLayoutAppearance.selected.titleTextAttributes = selectedAttributes
        
        // 新增：适配紧凑宽度下的inline布局（如iPad横屏分屏场景）
        tabBarAppearnace.compactInlineLayoutAppearance.normal.titleTextAttributes = normalAttributes
        tabBarAppearnace.compactInlineLayoutAppearance.selected.titleTextAttributes = selectedAttributes
        
        tabBar.standardAppearance = tabBarAppearnace
        // 新增：iOS15+ 滚动到边缘时的TabBar样式，和standard保持一致即可
        if #available(iOS 15.0, *) {
            tabBar.scrollEdgeAppearance = tabBarAppearnace
        }
    }
}

• UITabBarAppearance包含三类布局样式，需分别配置才能覆盖所有设备和横竖屏场景：
  • stackedLayoutAppearance：堆叠布局，对应iPhone竖屏、小尺寸iPad竖屏场景
  • inlineLayoutAppearance：内嵌布局，对应常规尺寸iPad的横竖屏场景
  • compactInlineLayoutAppearance：紧凑内嵌布局，对应iPad分屏、大屏iPhone横屏场景
• iOS15起UITabBar的scrollEdgeAppearance默认会使用磨砂透明效果，未赋值的话页面滚动到边缘时TabBar样式会和配置不一致，建议同步赋值。

内容的提问来源于stack exchange，提问作者ImWH