How to override navigation options in functional component?

问题

To override navigation options using class components, it would be something like

export default class SomeClass extends Component {

    static navigationOptions = ({ navigation }) => {
        return {
            title: navigation.getParam('headerTitle'),
        }
    }

    componentDidMount() {
        this.props.navigation.setParams({ headerTitle: someVariableThatComesFromExternalCall })
    }

    ...
}

But how can I do this using functional component??

export default function SomeFunctionalCompoenent({ navigation }) {

    // How and Where do I change the header title ?

    useEffect(() => { navigation.setParams({ headerTitle: someVariableThatComesFromExternalCall })})
    return (
        ...
    )
}

回答1:

You still need to define navigationOptions on your functional component. You do it like this:

export default function SomeFunctionalComponent({ navigation }) {
    useEffect(() => { 
        navigation.setParams({ 
            headerTitle: someVariableThatComesFromExternalCall 
        }) 
    }, [])
}

SomeFunctionalComponent.navigationOptions = ({ navigation }) => {
    return {
        title: navigation.getParam('headerTitle'),
    }
}

来源：https://stackoverflow.com/questions/55505026/how-to-override-navigation-options-in-functional-component