其实也就是找你的上几层控制器

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

//PhotoEssayViewController就是你的不同的控制器，判断是哪个控制器跳转到当前页面的

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

//此处写操作代码

PhotoEssayViewController *photosVC =(PhotoEssayViewController *)controller;

photosVC.str = self.str;

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

}

//VideoEssayViewController则是另外一个控制器，

else if ([controller isKindOfClass:[VideoEssayViewController class]]) {

//此处写操作代码

VideoEssayViewController *videoVC = (VideoEssayViewController *)controller;

videoVC.str = self.str;

}

}

第二种，则是通过navigationController.viewControllers的数组来找

//self.navigationController.viewControllers.count-2
是你当前控制器的上层控制器

if ([[self.navigationController.viewControllers objectAtIndex:self.navigationController.viewControllers.count-2] isKindOfClass:[MySelfTableViewController class]]) {

MySelfTableViewController *myselfVC = [self.navigationController.viewControllers objectAtIndex:self.navigationController.viewControllers.count-2];

//找到之后进行操作咯

UILabel *currentCity = [myselfVC.view viewWithTag:3004];

currentCity.text = self.provinceStr;

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

}