iOS13 tabBar 设置背景色失效

升级到 iOS 13后，之前正常显示的 tabBar 的背景色设置失效了。
解决方法如下，代码展示：

+(void)initialize {
    NSDictionary *attrNormal = @{NSFontAttributeName:[UIFont boldSystemFontOfSize:15],NSForegroundColorAttributeName:kLightGrayColor};
    NSDictionary *attrSelect = [NSDictionary dictionary];
    UITabBar *tabBar = [UITabBar appearance];
    //ios 13 之后需要这样设置才有效
    if (@available(iOS 13.0, *)) {
        attrSelect = @{NSFontAttributeName:[UIFont boldSystemFontOfSize:15],NSForegroundColorAttributeName:[UIColor labelColor]};
        UITabBarAppearance *tabBarAppearance = [[UITabBarAppearance alloc]init];
        //设置tabar背景色
        tabBarAppearance.backgroundColor = [UIColor secondarySystemGroupedBackgroundColor];
        tabBarAppearance.stackedLayoutAppearance.normal.titleTextAttributes = attrNormal;
        tabBarAppearance.stackedLayoutAppearance.selected.titleTextAttributes = attrSelect;
        //必须要加上这两句
        tabBar.standardAppearance = tabBarAppearance;
        if (@available(iOS 15.0, *)) {
            tabBar.scrollEdgeAppearance = tabBarAppearance;
        } else {
            // Fallback on earlier versions
        }
    } else {
        attrSelect = @{NSFontAttributeName:[UIFont boldSystemFontOfSize:15],NSForegroundColorAttributeName:kBlackColor};
        UITabBarItem *tbItem = [UITabBarItem appearance];
        [tbItem setTitleTextAttributes:attrNormal forState:UIControlStateNormal];
        [tbItem setTitleTextAttributes:attrSelect forState:UIControlStateSelected];
        [tabBar setBarTintColor:kWhiteColor];  //tabBar的背景色
    }
    tabBar.translucent = YES;     //translucent: 半透明的
}
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