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Version: 4.x

NavigationContext

NavigationContext provides the navigation object (similar to the navigation prop). In fact, withNavigation uses this context to inject the navigation prop to your wrapped component. The hook counterpart is essentially an useContext with this context as well.

Most of the time, you won't use NavigationContext directly, as the provided withNavigation and hooks already cover most use cases. But just in case you have something else in mind, NavigationContext is available for you to use.

Example with hooks‚Äč

import { useState, useContext, useEffect } from 'react';
import { NavigationContext } from 'react-navigation';

export function useFocusState() {
const navigation = useContext(NavigationContext);
const isFocused = navigation.isFocused();
const [focusState, setFocusState] = useState(getInitialFocusState(isFocused));
function handleEvt(e) {
const newState = focusStateOfEvent(e.type);
newState && setFocusState(newState);
}
useEffect(() => {
const subsA = navigation.addListener('action', handleEvt);
const subsWF = navigation.addListener('willFocus', handleEvt);
const subsDF = navigation.addListener('didFocus', handleEvt);
const subsWB = navigation.addListener('willBlur', handleEvt);
const subsDB = navigation.addListener('didBlur', handleEvt);
return () => {
subsA.remove();
subsWF.remove();
subsDF.remove();
subsWB.remove();
subsDB.remove();
};
});
return focusState;
}