返回上一级页面
[self.navigationController popViewControllerAnimated:YES];
返回根页面vc
[self.navigationController popToRootViewController］
返回指定的某个vc用下面（通过index定位）
[self.navigationController popToViewController[self.navigationController.viewControllers objectAtIndex:2] animated:YES];
或（通过class定位）
for (UIViewController *controller in self.navigationController.viewControllers) {
if ([controller isKindOfClass:[你要跳转到的Controller class]]) {
[self.navigationController popToViewController:controller animated:YES];
}
}
