Change your tab bar's tintColor
using the appearance proxy, e.g.:
[[UITabBar appearance] setTintColor:[UIColor yellowColor]];
To change the tintColor
of all views, including your label, you can do the following in your AppDelegate.m file:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[[UIView appearance] setTintColor:[UIColor yellowColor]];
return YES;
}