react-native-navigation/docs/docs/constants.md

Constants

!> Note! iOS resolves the values from the currently displayed root. If the current root doesn’t contain BottomTabs - it will return 0 as the BottomTabs height while Android will always return a static value.

statusBarHeight

const constants = await Navigation.constants();
const statusBarHeight = constants.statusBarHeight;

topBarHeight

const constants = await Navigation.constants();
const topBarHeight = constants.topBarHeight;

bottomTabsHeight

const constants = await Navigation.constants();
const bottomTabsHeight = constants.bottomTabsHeight;