如何覆盖功能组件中的导航选项?

时间:2019-04-03 22:06:06

标签: react-native react-navigation

要使用类组件覆盖导航选项,将类似于

export default class SomeClass extends Component {

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

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

    ...
}

但是我该如何使用功能组件呢?

export default function SomeFunctionalCompoenent({ navigation }) {

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

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

2 个答案:

答案 0 :(得分:2)

您仍然需要在功能组件上定义navigationOptions。您是这样做的:

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

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

答案 1 :(得分:2)

我怀疑接受的答案不是针对当前最新版本的react导航(5),而且绝对不适用于该版本,因此这是@ react-navigation / native的有效示例v5.7.2:

export default function SomeFunctionalComponent({ navigation }) {
  useEffect(() => { 
    navigation.setOptions({ 
      headerTitle: 'some other title',
    }) 
  }, [])
}

我已使用它来访问反应上下文-获取用户的名称和头像,以便为他们设置漂亮的标题栏。我在此粘贴了代码,以防它对任何人有帮助:

import React, { useContext, useEffect } from 'react';
import UserContext from '../context/UserContext';

const HomeScreen = ({ navigation }) => {

  const userContext = useContext(UserContext);

  useEffect(() => {
    navigation.setOptions({
      title : userContext.name,
      headerLeft : () => (
        <TouchableOpacity
          onPress={() => {
            navigation.openDrawer();
          }}
        >
          <FastImage
            style={styles.userPhoto}
            resizeMode={FastImage.resizeMode.cover}
            source={{ uri: userContext.avatar }}
          />
        </TouchableOpacity>
      ),
    });
  }, [ userContext ]);

  return (
    // etc
  );
}