获取VC

//在cell中获取到cell所属的ViewController
- (AnchorMoreViewController *)parentViewController
{
for (UIView* next = [self superview]; next; next = next.superview) {
    UIResponder *nextResponder = [next nextResponder];
    if ([nextResponder isKindOfClass:[AnchorMoreViewController class]]) {
        return (AnchorMoreViewController *)nextResponder;
    }
}
return nil;
}

// 获取NavigationController中的某个VC
SingleTopicViewController *target = nil;
for (UIViewController * controller in self.navigationController.viewControllers) { //遍历
    if ([controller isKindOfClass:[SingleTopicViewController class]]) { //这里判断是否为你想要跳转的页面
        target = (SingleTopicViewController *) controller;
    }
}
if (target) {
    self.topicName = target.topicModel.title;
    self.topid = target.topicModel.topid;
}