只有當特定視圖不出現時才彈出視圖控制器

Question

我有一個viewController，當我移動到應用程序中的另一個選項卡時，我想讓他彈出。我的問題是，當我在這個視圖中時，我有一個用於添加ABPeoplePickerNavigationController的人的「加號」按鈕，當人員選擇器變爲活動狀態時，視圖也會彈出，所以當我完成選擇應用程序的人員時，因爲它沒有任何意見可以回來。

這是viewWillDisappear：

- (void)viewWillDisappear:(BOOL)animated 
{ 
    [self.navigationController popViewControllerAnimated:YES]; 
} 

我怎樣才能解決呢？

新代碼：

- (void)viewWillDisappear:(BOOL)animated 
{ 
    NSArray *controllers = self.darioTabController.childViewControllers; 
    UIView *v; 

    for (UIViewController *vc in controllers) 
    { 
     if ([vc isKindOfClass:[@"ModalPresnterViewController" class]]) // or even [ABPeoplePickerNavigationController class] 
     { 
      v = vc.view; 
     } 
     else 
      [self.navigationController popViewControllerAnimated:YES]; 
    } 
} 

謝謝！

Answer 1

如果你想要的操作，只有當你點擊就可以使用TabBarController委託方法的標籤欄發生：

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController 
{ 
    //The user click on the item corresponding to ABPeoplePickerNavigationController 
    if([viewController isKindOfClass:[ABPeoplePickerNavigationController class]]) 
    { 
    //Do something if you cant 
    } 
    else // The user click on an other view controller (pop the ABPeoplePickerNavCtrl) 
    { 
    [yourController.navigationController popViewControllerAnimated:YES]; 
    } 
} 

或者可以查看哪個TabBarItem選擇：

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController 
{ 
    //Check if the selected view controller (ABPeopleNavCtrl) 
    if(tabBarController.selectedIndex == indexOfTheABPeoplePickNavigationController) 
    { 

    } 
    else // Else the user tap on an other item, so pop the controller you want 
    { 
    [theViewControllerToPop.navigationController popViewControllerAnimated:YES]; 
    } 
} 

注意：記住設置UITabBarController代理;）