关于ios:ios15-tabbar去掉透明和上面黑线

if (@available(iOS 15.0, *)) {

    UITabBarAppearance *tabbarAppearance = [UITabBarAppearance new];    [tabbarAppearance configureWithDefaultBackground];    tabbarAppearance.backgroundColor = [UIColor whiteColor];    tabbarAppearance.shadowColor = [UIColor clearColor];    tabbarAppearance.backgroundImage = [UIImage new];    UITabBar.appearance.standardAppearance = tabbarAppearance;    UITabBar.appearance.scrollEdgeAppearance = tabbarAppearance;}