How to know the useful height of an iOS device in React Native?

As @mohammed-ashfaq said, react-native-safe-area solves the problem. However, it returns the insets with a promise and I needed those values statically.

Given that, I created react-native-static-safe-area-insets that enables access to the insets values as constants.

You can use the react-native-safe-area. it provides function to Get safe area inset top, bottom, left, right.

import SafeArea, { type SafeAreaInsets } from 'react-native-safe-area'

//Retrieve safe area insets for root view

SafeArea.getSafeAreaInsetsForRootView()
.then((result) => {
   console.log(result)
   // { safeAreaInsets: { top: 44, left: 0, bottom: 34, right: 0 } }
})