Answers for "react native definer header status bar height"

get status bar height react native

import {NativeModules} from 'react-native';
const {StatusBarManager} = NativeModules;
const STATUSBAR_HEIGHT = Platform.OS === 'ios' ? 20 : StatusBarManager.HEIGHT;

react native header height

import { useHeaderHeight } from '@react-navigation/elements';
const headerHeight = useHeaderHeight();