我有三个UIViewController。我正在从VC1导航到VC3。如果我从VC3单击取消或完成按钮，我想导航到VC2。我已经以编程方式将VC2Controller添加到导航堆栈。DocListViewController*temp1=[[DocListViewControlleralloc]initWithNibName:@"DocListViewController"bundle:nil];[self.navigationControlleraddChildViewController:temp1];for(UIViewController*controllersinself.n