NavigatorController爲零

Question

AppDelegate.m

_viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]; 

UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:_viewController]; 
     nav.navigationBar.barStyle = UIBarStyleBlackOpaque; 
[_window addSubview:nav.view]; 

ViewContoller.m

UINavigationController *nav = self.navController; 
[nav pushViewController:controller animated:YES]; 

我不知道爲什麼總是UINavigationController爲零。

請幫忙!!

Answer 1

而不是增加navigationController的觀點爲window的subview嘗試添加navigationController作爲窗口的rootViewController

window.rootViewController = nav; 
[_window makeKeyAndVisible]; 

Answer 2

新的解決方案的

試試這個

在AppDelegate.m

@implementation AppDelegate 
{} 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    UINavigationController *_navController = [[UINavigationController alloc] init]; 
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    self.window.rootViewController = _navController; 

    ViewController* _viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]; 
    [_navController pushViewController:_viewController animated:YES]; 

    return YES; 
} 

在ViewContoller.m現在這將工作：

UINavigationController *nav = self.navigationController; 
[nav pushViewController:controller animated:YES]; 

老辦法

嘗試AppDelegate.h這個代碼

一定要有這個至少

@interface AppDelegate : NSObject <UIApplicationDelegate> 
{} 

@property (nonatomic, retain) IBOutlet UIWindow *window; 
@property (nonatomic, retain) IBOutlet UINavigationController *navController; 

@end 

在AppDelegate.m至少這在故事板

@implementation AppDelegate 
{} 

@synthesize window=_window; 
@synthesize navController=_navController; 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    UINavigationController *_navController = self.window.rootViewController; 

    UIViewController* _viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]; 
    [_navController pushViewController:_viewController animated:YES]; 

    return YES; 
} 

@end 

一定要已經創建了一個NavigationController綁定到的ViewController，定義爲初始視圖控制器和綁定作爲根視圖控制器綁定視圖控制器

在應用常規設置選項卡請務必在部署信息部分設置故事板（也可以在本節中設置狀態欄樣式）

在ViewContoller.m現在這將工作：

UINavigationController *nav = self.navigationController; 
[nav pushViewController:controller animated:YES]; 

編輯的導航欄樣式，你可以這樣來做

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    self.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque; 
} 

Answer 3

homeViewController = (mainStoryboard.instantiateViewControllerWithIdentifier("register") as? RegisterViewController)! 
let navigationController :UINavigationController = UINavigationController() 

navigationController.pushViewController(homeViewController, animated: true) 
       navigationController.navigationBarHidden = false 
       window?.rootViewController = nil 
       window?.rootViewController = navigationController 
       window?.makeKeyWindow() 

Answer 4

@interface AppDelegate() 
    @property (strong, nonatomic) UINavigationController *navigationController; 
    @end  

//In Your Appdelegate didfinishlaunching method: 

    self.window = [[UIWindow alloc] init]; 
    [self.window makeKeyAndVisible]; 
    self.navigationController = [[UINavigationController alloc] initWithRootViewController: YourViewController]; 
    self.window.rootViewController = self.navigationController; 


    //In Your View controller: 
    [self.navigationController pushViewController:controller animated:YES];