标签栏颜色自定义
[[UITabBar appearance] setTintColor:[UIColor whiteColor]];
[[UITabBar appearance] setBarTintColor:[UIColor tabBarBackgroundColor]];
[[UITabBar appearance] setBackgroundColor:[UIColor tabBarInactiveColor]];
[[UINavigationBar appearance] setBarTintColor:[UIColor appBlueColor]];
[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];
[[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];