NavigatorController是零

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];

我不知道为什么UINavigationController总是为零。

请帮助!!

Answer 1

不要将navigationController的视图添加为window的{​​{1}}，而是尝试将subview添加为窗口navigationController

rootViewController

Answer 2

新解决方案

试试这个

AppDelegate.m

中的

@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 中现在可以使用：

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

旧解决方案

试试这段代码

AppDelegate.h 中的

一定要至少

@interface AppDelegate : NSObject <UIApplicationDelegate>
{}

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

@end

在 AppDelegate.m 至少这个

@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

故事板中的

一定要创建一个绑定到ViewController的NavigationController，定义为初始视图控制器并绑定为绑定视图控制器的根视图控制器

在应用常规设置标签中，请务必在部署信息部分设置故事板（在本节中也可以设置状态栏样式）

在 ViewContoller.m 中现在可以使用：

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

编辑navigationBar样式，你可以这样做

- (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

{{1}}