任意控制器跳转

（推荐下面这种，不受控制器数量影响）

for (UIViewController *controller in self.navigationController.viewControllers) {

if ([controller isKindOfClass:[Controller class]]) {

[self.navigationController  popToViewController:controller animated:YES];

}

}

方式三，推荐  这种方式适合返回指定控制器并调用其方法（比如刷新什么的）// 需要返回调用的

MylanController *myIVC = nil;

for (int i = 0; i < self.navigationController.viewControllers.count; i++) {

CustomViewController *cv = self.navigationController.viewControllers[i];

if ([cv isKindOfClass:[MylanController class]]) {

myIVC = (MylanController *)cv;

break;

}}

[self.navigationController  popToViewController:myIVC animated:YES];

[myIVC refreshTableView];