UITabbar自定义

 oneViewController * first =[oneViewController new];

    UINavigationController * oneNav =[[UINavigationController  alloc]initWithRootViewController:first];

    oneNav.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"XX" image:[UIImage imageNamed:@""] selectedImage:[UIImage imageNamed:@""]];

    twoViewController * second =[twoViewController new];

    UINavigationController * twoNav =[[UINavigationController  alloc]initWithRootViewController:second];

    twoNav.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"XX" image:[UIImage imageNamed:@""] selectedImage:[UIImage imageNamed:@""]];

    threeViewController * third =[threeViewController new];

    UINavigationController * threeNav =[[UINavigationController  alloc]initWithRootViewController:third];

    threeNav.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"XX" image:[UIImage imageNamed:@""] selectedImage:[UIImage imageNamed:@""]];

    fourViewController * fouth = [fourViewController new];

    UINavigationController * fourNav = [[UINavigationController alloc]initWithRootViewController:fouth];

    fourNav.tabBarItem = [[UITabBarItem alloc]initWithTitle:@"XX" image:[UIImage imageNamed:@""] selectedImage:[UIImage imageNamed:@""]];

    fiveViewController * fifth =[fiveViewController new];

    UINavigationController * fiveNav =[[UINavigationController  alloc]initWithRootViewController:fifth];

    fiveNav.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"XX" image:[UIImage imageNamed:@""] selectedImage:[UIImage imageNamed:@""]];

    self.viewControllers=@[oneNav,twoNav,threeNav,fourNav,fiveNav];