ios - 如果我从推送通知启动我的应用程序，为什么我的导航栏会消失？

Question

我有一个应用程序，其中有一个包含所有推送通知列表的 subview Controller 。因此，我想在用户从推送通知启动应用程序时加载此 View Controller 。我正在启动正确的 View Controller (NotifcationsViewController)，但它不包括它应该具有的导航栏。如果我从 parent 那里启动 Controller ，它只有导航栏。以下代码在我的 appDelegate.m 文件中。

- (void) application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo

{

if ( application.applicationState == UIApplicationStateInactive || application.applicationState == UIApplicationStateBackground  )
{
    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard"
                                                             bundle: nil];
    UINavigationController *nav = [mainStoryboard instantiateViewControllerWithIdentifier:@"NotificationsViewController"];
    [_window setRootViewController:nav];

     }
}

NotificationsViewController 有/应该有一个左侧导航栏项目，它会弹回到它的 parentViewController。

Answer 1

试试这个

if ( application.applicationState == UIApplicationStateInactive || application.applicationState == UIApplicationStateBackground  )
{
    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard"
                                                bundle: nil];
    UIViewController *viewController= [mainStoryboard instantiateViewControllerWithIdentifier:@"NotificationsViewController"];
    UINavigationController *nav = [[UINavigationController alloc]
                            initWithRootViewController:viewController];
    [_window setRootViewController:nav];

     }
}