popToViewController用法
方式一，不推荐
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:2] animated:YES];
方式二，推荐
for (UIViewController *controller in self.navigationController.viewControllers) {
if ([controller isKindOfClass:[你要跳转到的Controller class]]) {
[self.navigationControllerpopToViewController:controller animated:YES];
}
}
UIViewController *viewController = nil;
for (LoginVC *tempVc in self.navigationController.viewControllers) {
if ([tempVc isKindOfClass:[LoginVC class]]) {
viewController = tempVc;
}
}
[self.navigationController popToViewController:viewController animated:YES];
方式三，推荐 这种方式可以适合返回指定控制器并调用其方法（比如刷新）
// 返回调用的控制器
LLXXXcontroller *myControl = nil;
for (int i = 0; i < self.navigationController.viewControllers.count; i++) {
CustomViewController *cv = self.navigationController.viewControllers[i];
if ([cv isKindOfClass:[LLXXXcontroller class]]) {
myControl = (LLXXXcontroller *)cv;
break;
}
}
[self.navigationController popToViewController:myControl animated:YES];
[myControl refreshData];
