在Swift中以编程方式设置tabBarItem标题和底部布局之间的间距

class CustomTabBarController: UITabBarController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置TabBarItem的标题和底部布局之间的间距
        if let items = tabBar.items {
            for item in items {
                item.titlePositionAdjustment = UIOffset(horizontal: 0, vertical: -10)
            }
        }
    }
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // 创建并设置自定义的TabBarController
    let tabBarController = CustomTabBarController()
    // 设置TabBarController作为根视图控制器
    window?.rootViewController = tabBarController
    
    // 添加其他的ViewController到TabBarController中
    // ...
    
    return true
}