react-native-screens/lib/module/native-stack/utils/getDefaultHeaderHeight.js

Native navigation primitives for your React Native app.

import { Platform } from 'react-native';
const formSheetModalHeight = 56;
export default function getDefaultHeaderHeight(layout, topInset, stackPresentation) {
  // default header heights
  let headerHeight = Platform.OS === 'android' ? 56 : 64;
  let statusBarHeight = topInset;

  if (Platform.OS === 'ios') {
    const isLandscape = layout.width > layout.height;
    const isFromSheetModal = stackPresentation === 'modal' || stackPresentation === 'formSheet';

    if (isFromSheetModal && !isLandscape) {
      // `modal` and `formSheet` presentations do not take whole screen, so should not take the inset.
      statusBarHeight = 0;
    }

    if (Platform.isPad || Platform.isTVOS) {
      headerHeight = isFromSheetModal ? formSheetModalHeight : 50;
    } else {
      if (isLandscape) {
        headerHeight = 32;
      } else {
        headerHeight = isFromSheetModal ? formSheetModalHeight : 44;
      }
    }
  }

  return headerHeight + statusBarHeight;
}
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