iOS - 如何返回上一個界面並傳值給上一個界面

- (void) goBackToPersonInfoVCWithNickName:(NSString *) nickName{  
    //            [self.navigationController popViewControllerAnimated:YES];  
    //此頁面已經存在於self.navigationController.viewControllers中,並且是當前頁面的前一頁面  
    PersonInfoViewController *personVC = [self.navigationController.viewControllers objectAtIndex:self.navigationController.viewControllers.count-2];  
    //初始化其屬性  
    //            personVC.sexInt = _sex;  
    //傳遞參數過去  
    personVC.nickName = nickName;  
    //使用popToViewController返回並傳值到上一頁面  
    [self.navigationController popToViewController:personVC animated:true];  
      
}