NavigationBar has white borderBottom

[bosung90]

Version

"react-native": "^0.22.0",
"react-native-router-flux": "aksonov/react-native-router-flux#dcc7558",

Expected behaviour

No white border between navigationBar and content

Actual behaviour

White border between navigationBar and content

Steps to reproduce

1. Make navigationBar backgroundColor red
2. Make content dark
3. Notice there is white border between navigationBar and content.

Temporarily fix

set navigationBarStyle to have borderBottomWidth: 0,

[aksonov]

Use your fix to remove border, it is not a bug, but behaviour of built-in NavBar. You may pass your own NavBar if you want.