ios - 如何仅更改 UITabBar 项目中的字体大小？

Question

如何只改变 UITabBar Item 中的字体大小？

在我的 AppDelegate 中:

这是我加的

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // [START initialize_firebase]
        FirebaseApp.configure()
        // [END initialize_firebase]
        // Override point for customization after application launch.


    let selectedAttr = UITabBarItem.appearance().titleTextAttributes(for: UIControlState.selected)
    let normalAttr = UITabBarItem.appearance().titleTextAttributes(for: UIControlState.normal)
    //
    UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: normalAttr.fontName, size: 15)!], for: UIControlState.normal)


    UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: normalAttr.fontname, size: 15)!], for: UIControlState.selected)

        return true
    }

但我没有看到任何 normalAttr.fontName 属性。我该如何解决这个问题？

Answer 1

titleTextAttributes(for:) 返回一个字典，您可以使用它来键入查找字体。

    let normalAttr = UITabBarItem.appearance().titleTextAttributes(for: UIControlState.normal)
    let font = normalAttr[NSFontAttributeName] as! UIFont // <-- This instance has a property called `fontName`
...
    UITabBarItem.appearance().setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: font.fontName, size: 15)!], for: UIControlState.normal)