switch case in protected scope 异常解决

case添加{ }后，编译错误可解决。

- (void)tabBar:(UITabBar *)tb didSelectItem:(UITabBarItem *)item {

     switch(item.tag) {
        case 0:
        {
        }
            break;
        case 1:
        {
        }
            break;
        default:
            break;
    }
}