ios 26的tabbar 背景透明

 if #available(iOS 13.0, *){

            let appearance = UITabBarAppearance()

            appearance.configureWithTransparentBackground()

            // 移除阴影和边框

            appearance.shadowColor = .clear

            appearance.shadowImage = UIImage()

            appearance.backgroundImage = UIImage()

            // 设置标准外观

            tabBar.standardAppearance = appearance

            // iOS 15 需要设置 scrollEdgeAppearance

            if #available(iOS 15.0, *) {

                tabBar.scrollEdgeAppearance = appearance

            }

            appearance.backgroundImage = UIImage()

            appearance.shadowImage = UIImage()

            appearance.backgroundColor = .clear

            tabBar.standardAppearance = appearance

        }else{

           tabBar.isTranslucent = true

           tabBar.backgroundColor = .clear

        }