iOS UITabBarController 的 UITabBar 自定义

//UITabBar *tab = [[UITabBar alloc] initWithFrame:CGRectZero];
    UIView *tabView = [[UIView alloc] initWithFrame:CGRectMake(0, _tabBarVC.view.frame.size.height - 49, _tabBarVC.view.frame.size.width, 49)];
    tabView.backgroundColor = [UIColor redColor];
    for (int i = 0 ; i< 2; i++) {
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        btn.frame = CGRectMake(10 + i*150, 10, 60, 20);
        btn.tag = i;
        [btn setTitle:[NSString stringWithFormat:@"%d",i] forState:UIControlStateNormal];
        [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
        [tabView addSubview:btn];
    }
    [_tabBarVC.view addSubview:tabView];

//    [self.navigationController pushViewController:_tabBarVC animated:YES];