Question

因此，当用户按下推送通知时，我尝试加载NotificationsViewController。在我的应用程序中，我尝试加载的viewController有一个导航栏（包含一个弹回到上一个视图的后退按钮）。我在appDelegate.m

中实现了以下代码

- (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];
}
}

现在当我按下推送通知时，它会启动到右视图控制器。但是，它没有我的导航栏。我该如何解决这个问题？感谢

Answer 1

由于NotificationsViewController嵌入在导航控制器中，您应该将其实例化并将其设置为窗口的根视图控制器，

- (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:@"Nav"];
       [_window setRootViewController:nav];
    }
}

请务必为导航控制器提供与您在此处使用的标识符匹配的标识符。当导航控制器成为窗口的根视图控制器时，它将显示其topViewController，这可能是你的NotificationsViewController。

ViewController如果从App Delegate启动，则显示没有导航栏

1 个答案: