In my react native app I'm noticing that my header element is behaving differently on ios than android. I set the header title to width: 100% but on ios it still has considerable margins on both sides. You can see in the code that I'm trying to split the title to have two strings displayed in the header so I would like to use all the space I can get. I've got a dummy string displaying for now to clearly show the margins and differences between the platforms. Nothing I do seems to get the title to take the full width. I have some simple styles on the dummy string but I have more complete styles on the splitHeaderContainer and it behaves the same.

I appreciate any help, thanks.

See linked images for clarity

import React from 'react';
import {createBottomTabNavigator} from '@react-navigation/bottom-tabs';
import FontAwesome6 from 'react-native-vector-icons/FontAwesome6';
import {useTranslation} from 'react-i18next';
import {createNativeStackNavigator} from '@react-navigation/native-stack';
import type {RootStackParamList} from './types';
import AuthorityDetailsScreen from '../screens/authorities/AuthorityDetailsScreen';
import ElectionsScreen from '../screens/elections/ElectionsScreen';
import SignersScreen from '../screens/signers/SignersScreen';
import AuthoritiesScreen from '../screens/authorities/AuthoritiesScreen';
import SettingsScreen from '../screens/settings/SettingsScreen';
import {ChipButton} from '../components/ChipButton';
import {Pressable, StyleSheet, View, Text} from 'react-native';
import {ExtendedTheme, useNavigation} from '@react-navigation/native';
import {useTheme} from '@react-navigation/native';
import NetworksScreen from '../screens/networks/NetworksScreen';
import type {NavigationProp} from './types';

const Stack = createNativeStackNavigator<RootStackParamList>();
const Tab = createBottomTabNavigator();

function SplitHeaderTitle() {
    const {colors} = useTheme() as ExtendedTheme;
    return (
        <View style={styles.splitHeaderContainer}>
            <Text
                style={[styles.headerText, stylesworkText, {color: colors.text}]}
                numberOfLines={1}>
                Current Network
            </Text>
            <Text
                style={[styles.headerText, styles.usernameText, {color: colors.text}]}
                numberOfLines={1}>
                Username Username
            </Text>
        </View>
    );
}

function useTabHeaderOptions() {
    const {colors} = useTheme() as ExtendedTheme;
    const navigation = useNavigation<NavigationProp>();

    const handleNetworkPress = () => {
        navigation.navigate('Networks');
    };

    return {
        headerLeft: () => (
            <Pressable onPress={handleNetworkPress} style={styles.headerButton}>
                <FontAwesome6 name="circle-nodes" size={24} color={colors.text} />
            </Pressable>
        ),
        headerRight: () => (
            <Pressable style={styles.headerButton}>
                <FontAwesome6 name="circle-user" size={24} color={colors.text} />
            </Pressable>
        ),
        //headerTitle: () => <SplitHeaderTitle />,
        headerTitle: () => (
            <Text style={{width: '100%', color: colors.text}}>
                Hello this is a very long text to show how it cuts off
            </Text>
        ),
        headerShadowVisible: false,
    };
}

const TabNavigator = () => {
    const {colors} = useTheme() as ExtendedTheme;
    const {t} = useTranslation();
    const tabHeaderOptions = useTabHeaderOptions();

    return (
        <Tab.Navigator
            screenOptions={({route}) => ({
                tabBarIcon: ({focused, color, size}) => {
                    let iconName: string;

                    switch (route.name) {
                        case 'Elections':
                            iconName = 'check-to-slot';
                            break;
                        case 'Signers':
                            iconName = 'person';
                            break;
                        case 'Authorities':
                            iconName = 'shield';
                            break;
                        case 'Settings':
                            iconName = 'gear';
                            break;
                        default:
                            iconName = 'alert';
                    }

                    return <FontAwesome6 name={iconName} size={size} color={color} />;
                },
                tabBarActiveTintColor: colors.primary,
                tabBarInactiveTintColor: 'gray',
            })}>
            <Tab.Screen
                name="Elections"
                component={ElectionsScreen}
                options={{...tabHeaderOptions}}
            />
            <Tab.Screen
                name="Signers"
                component={SignersScreen}
                options={{...tabHeaderOptions}}
            />
            <Tab.Screen
                name="Authorities"
                component={AuthoritiesScreen}
                options={tabHeaderOptions}
            />
            <Tab.Screen
                name="Settings"
                component={SettingsScreen}
                options={{...tabHeaderOptions}}
            />
        </Tab.Navigator>
    );
};

const styles = StyleSheet.create({
    splitHeaderContainer: {
        flex: 1,
        flexDirection: 'row',
        justifyContent: 'space-between',
        alignItems: 'center',
        paddingHorizontal: 2,
        width: '100%',
    },
    headerText: {
        fontSize: 16,
        fontWeight: '500',
    },
    networkText: {
        flex: 1,
        textAlign: 'left',
        marginRight: 8,
    },
    usernameText: {
        flex: 1,
        textAlign: 'right',
        opacity: 0.7,
    },
    headerButton: {
        padding: 8,
        marginHorizontal: 4,
        marginVertical: -2,
    },
});

export const RootNavigator = () => {
    const {t} = useTranslation();

    return (
        <Stack.Navigator>
            <Stack.Screen
                name="Tabs"
                component={TabNavigator}
                options={{headerShown: false}}
            />
            <Stack.Screen
                name="AuthorityDetails"
                component={AuthorityDetailsScreen}
                options={{
                    title: t('authority'),
                    headerRight: () => (
                        <ChipButton label={t('unpin')} icon={'thumbtack-slash'} />
                    ),
                }}
            />
            <Stack.Screen
                name="Networks"
                component={NetworksScreen}
                options={{
                    title: t('joinANetwork'),
                }}
            />
        </Stack.Navigator>
    );
};

Images:

android_ios_side_by_side

inspector_view