remove 1px bottom line of the navigation bar

remove-bottom-line-navbar.md

If you just want to use a solid navigation bar color and have set this up in your storyboard, use this code in your AppDelegate class to remove the 1 pixel border via the appearance proxy:

Objective-C

[[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init]
                                  forBarPosition:UIBarPositionAny
                                      barMetrics:UIBarMetricsDefault];

[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];

Swift 3.x

        UINavigationBar.appearance().shadowImage = UIImage()
        UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .default)

NOTE: must set isTransluscent UINavigationBar instance to false to avoid transparent navigation bar; either in storyboard or in code

navigationController?.navigationBar.isTranslucent = false

// or

navigationBar.isTranslucent = false