In iOS7 tintColor , try the following:
[[UITabBar appearance] setTintColor:[UIColor redColor]];
Edit
To tint inactive buttons, enter the code below into your VC viewDidLoad :
[self.tabBarItem setFinishedSelectedImage:[UIImage imageNamed:@"item_seleted.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"item_unselected.png"]];
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