更改UITabBarItem字体时遇到问题

Question

我正在尝试为iOS13中的标签栏设置一个自定义字体，下面的方法几乎是可行的，但是只有当标签栏项目被选中后，字体才会被更改。 你能告诉我我错过了什么吗？

class MainTabBarController: UITabBarController {
    
    private func setTabBarFont (_ appearance: UITabBarItemAppearance) {
        let myFont = UIFont(name: "Dosis", size: 12)!
        appearance.normal.titleTextAttributes = [NSAttributedString.Key.font: myFont]
        appearance.focused.titleTextAttributes = [NSAttributedString.Key.font: myFont]
        appearance.selected.titleTextAttributes = [NSAttributedString.Key.font: myFont]
        appearance.disabled.titleTextAttributes = [NSAttributedString.Key.font: myFont]
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

        let appearance = tabBar.standardAppearance
        
        setTabBarFont(appearance.stackedLayoutAppearance)
        setTabBarFont(appearance.inlineLayoutAppearance)
        setTabBarFont(appearance.compactInlineLayoutAppearance)

        self.tabBar.standardAppearance = appearance
    }
}

Answer 1

从Tabbar中获取items并循环通过它们来设置TitleTextAttributes，即。

override func viewDidLoad() {
    if let items = self.tabBar.items {
        items.forEach {
            $0.setTitleTextAttributes([
                .font: UIFont.systemFont(ofSize: 10.0, weight: .bold),
                .foregroundColor: UIColor.red
            ], for: .normal)
        }
    }
}

Answer 2

它将工作，如果你改变字体以下方式

let fontAttributes = [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 12.0)]
UITabBarItem.appearance().setTitleTextAttributes(fontAttributes, for: .normal)