如何在執行popToRootViewController后將視圖控制器推送到導航堆棧

Question

我只是在將堆棧彈出到rootviewcontroller之后才嘗試將新的視圖控制器推送到導航堆棧

//Select the tab I want to go to
self.tabBarController.selectedIndex = FEEDPAGE_INDEX;

//Retrieve the navcon in the feed page
UINavigationController *navcon = (UINavigationController*)[self.tabBarController.viewControllers objectAtIndex:FEEDTAB_INDEX];

//Pop to root view controller here
[navcon popToRootViewControllerAnimated:YES];

//Push a new root view controller onto stack
QuestionAnswerViewController *x = [[QuestionAnswerViewController alloc]init];
[navcon pushViewController:x animated:YES];

推送無效，即沒有顯示新頁面。 似乎popToRootViewController導致這種情況發生（確切地說不確定）。 關於如何彈出然后推新頁面的任何建議？

Answer 1

QuestionAnswerViewController *x = [[QuestionAnswerViewController alloc]init];
UINavigationController *navcon = (UINavigationController*)[self.tabBarController.viewControllers objectAtIndex:FEEDTAB_INDEX];
NSArray *arr = [navcon viewControllers];
NSArray *newStack = [NSArray arrayWithObjects:[arr objectAtIndex:0], x, nil];
[navcon setViewControllers:newStack];