iOS UINavigationController未显示在ChildView上

Question

在我的项目中，我在该视图中具有loginviewcontroller，如果登录成功，则在viewWillAppear方法中隐藏了navigationcontroller，我具有以下代码

-(void)gotoCheckinPage{
DashboardViewController *v = [[DashboardViewController alloc]
                            initWithNibName:@"DashboardViewController" bundle:nil];

UINavigationController *navCon = [[UINavigationController alloc]
                                  initWithRootViewController:v];

[navCon.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbar_bg.png"]
                           forBarMetrics:UIBarMetricsDefault];

[self presentViewController:navCon animated:YES completion:nil];
}

但在仪表板视图控制器中未显示导航控制器

这就是我在loginview中隐藏navigationcontroller的方式

- (void)viewWillAppear:(BOOL)animated {
[self.navigationController setNavigationBarHidden:YES animated:animated];
[super viewWillAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
[self.navigationController setNavigationBarHidden:NO animated:animated];
[super viewWillDisappear:animated];
}

如果我评论这一行：

[self.navigationController setNavigationBarHidden:YES animated:animated];

没问题，但是想要在loginview中获取隐藏的navigationcontroller，然后在其他视图控制器中将其设置为active

有什么帮助吗？

Answer 1

写下您认为的代码。 您要在其中显示导航

-(void)viewWillAppear:(BOOL)animated{
    self.navigationController.navigationBarHidden = NO;
   }

Answer 2

您可以将其简单地添加到您的LoginViewController中：

-(void)viewWillAppear:(BOOL)animated
{
    self.navigationController.navigationBarHidden = YES; // Where you want to hide it.
}

在DashboardViewController中：

-(void)viewWillAppear:(BOOL)animated
{
    self.navigationController.navigationBarHidden = NO; // Where you want to show it.
}