隐藏导航控制器栏后的黑线

Question

I created my navigation controller programmatically, without storyboard and .nib. I needed to hide it so I used

[navigationController setNavigationBarHidden:YES]; 

in applicationDidFinishLaunchingWithOptions: . It looks fine on my root screen but at the top of the second view controller there is a black line at the place of the navigation bar which covers some of my button.

Can someone please explain to me what this is and how I can delete it?

Answer 1

You should set a custom shadow image and use it behind.

From Apple documentation:

For a custom shadow image to be shown, a custom background image must also be set with the setBackgroundImage:forBarMetrics: method. If the default background image is used, then the default shadow image will be used regardless of the value of this property.