To change the default color of the Tab-Bar�

Add the below code in viewWillAppear of your class

CGRect frame = CGRectMake(0.0, 0.0, self.view.bounds.size.width, 48);

UIView *v = [[UIView alloc] initWithFrame:frame];

[v setBackgroundColor:[UIColor colorWithRed:0.1 green:0.2 blue:0.6 alpha:0.8]];

[v setAlpha:0.5];

[[self.tabBarController tabBar] insertSubview:v atIndex:0];

[v release];

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Pradeep