UITabBarController 获得selecdIndex

UITabBarControllerDelegate
mainTabBarController.delegate = self;
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
    switch (tabBarController.selectedIndex) {
        case 0:///周边
            [self SetLFMBtnList_ZB];
            break;
        case 1:秀秀
            break;
        case 2://关注
            [self SetLFMBtnList_GZ];
            break;
        case 3://设置
            break;
        case 4://活动
            break;
        default:
            break;
    }
}