iOS push 后想回到任意控制器

参数说明：vc:想要回到的控制器名字  nav: 当前的UINavigationController

-(void)popWantVC:(UIViewController*)vc nav:(UINavigationController*)nav{

    for(UIViewController*controllerinnav.viewControllers) {

    if([controllerisKindOfClass:[vcclass]]) {

      [navpopToViewController:controller animated:YES];

    }

    }

}