導航控制器呈現視圖

Question

我是IOS編程新手。我想問一下如何在呈現的視圖中實例化導航控制器。這是我從前面的視圖實例化我的導航欄的方式。

SWRevealViewController *revealController = self.revealViewController; 

    UINavigationController *frontNavigationController = (id) revealController.frontViewController; 

    if (! [frontNavigationController.topViewController isKindOfClass:[CalibrateViewController class]]) { 
     CalibrateViewController *promotionViewController = [[CalibrateViewController alloc] init]; 
     UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:promotionViewController]; 
     [revealController setFrontViewController:navigationController animated:YES]; 
    } 
    else { 
     [revealController revealToggle:self]; 
    } 

但是，當我想以現在的看法做到這一點，

LoginViewController *promotionViewController = [[LoginViewController alloc] init]; 
[self presentViewController:promotionViewController animated:YES completion:nil]; 

我不知道要放什麼時候想用presentView實例。

任何幫助將不勝感激。提前致謝。

對不起，我感到困惑。基本上我想做這樣的事情：

1. 我有一個主視圖，我們將其命名爲viewA，它將調用viewB。
2. viewB然後將更改爲viewC。
3. 最後，當我解僱我的viewC時，它將回到viewA。
4. 所有的視圖都會有導航控制器。

而且，這裏是稍後在「viewB」，「viewC」上創建的導航按鈕。

SWRevealViewController *revealController = [self revealViewController]; 

[revealController panGestureRecognizer]; 
[self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer]; 

UIBarButtonItem *revealButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"reveal-icon.png"] style:UIBarButtonItemStyleBordered target:revealController action:@selector(revealToggle:)]; 


self.navigationItem.leftBarButtonItem = revealButtonItem; 


//check if whether to use barTintColor instead of tintColor. (IOS difference) 
if (IS_OS_7_OR_LATER) { 
    // here you go with iOS 7 
    self.navigationController.navigationBar.barTintColor = UIColorFromRGB(0x808080); 
} 
else 
{ 
    self.navigationController.navigationBar.tintColor = UIColorFromRGB(0x808080); 
} 

self.navigationController.navigationBar.translucent = YES; 
//======================================================================================= 

它給出了實例化導航按鈕的視圖上的錯誤。 錯誤看起來是這樣的： *終止應用程序由於未捕獲的異常「NSInvalidArgumentException」，原因是：「* - [__ NSArrayM insertObject：atIndex：]：對象不能是零」

Answer 1

這是你如何呈現navigationcontroller在特定視圖 - 控制

LoginViewController *promotionViewController = [[LoginViewController alloc] init]; 
UINavigationController *navigationController = [[UINavigationController alloc]init]; 
[navigationController pushViewController:promotionViewController animated:YES]; 
[self presentViewController:navigationController animated:YES completion:nil]; 

Answer 2

請參閱此鏈接可能是其對您有用Click Here

Answer 3

試試下面的代碼來代替你的代碼：

UINavigationController * frontNavigationController =（id）revealController.frontViewController;

if (! [frontNavigationController.topViewController isKindOfClass:[CalibrateViewController class]]) { 
     CalibrateViewController *promotionViewController = [[CalibrateViewController alloc] init]; 
     UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:promotionViewController]; 
     [self.navigationController pushViewController:navigationController animated:YES]; 
    } 
    else { 
     [revealController revealToggle:self]; 
    } 

Answer 4

基本上Presentmodelviewcontroller沒有導航控制器，我們需要編寫它，請按照下面的代碼

NextViewController *ivc= [[NextViewController alloc]init]; // here you are allocation your next viewController 
UINavigationController *naviCtrl =[[UINavigationController alloc]initWithRootViewController: ivc]; // here you are allocation navigation controller for your next viewController 
[self presentViewController:naviCtrl animated:YES completion:nil]; // here you are presenting your next view controller