导航栏返回指定界面

-(void)backAction{
    UINavigationController *navVC = self.navigationController;
    NSMutableArray *viewControllers = [[NSMutableArray alloc] init];
    for (UIViewController *vc in [navVC viewControllers]) {
        [viewControllers addObject:vc];
        if ([vc isKindOfClass:[指定的控制器 class]]) {
            break;
         }
    }
     [navVC setViewControllers:viewControllers animated:YES];
}​