6

我正在尝试使用 react-navigation-header-buttons 库向 headerRight 添加一个图标。但是显示的是图标的标题而不是图标。

这是应该显示图标的代码。

import React, { useState, useLayoutEffect } from 'react';
import { View, Text, Button, StyleSheet } from 'react-native'

import { MEALS } from '../data/DummyData';
import { HeaderButtons, Item } from 'react-navigation-header-buttons';
import { HeaderButton } from '../components/CustomHeaderButton';

const MealDetailScreen = props => {
    const mealId = props.route.params.mealId;
    const selectedMeal = MEALS.find(meal => meal.id == mealId);
    const [headerTitle, setHeaderTitle] = useState();

    useLayoutEffect(() => {
        setHeaderTitle(() => selectedMeal === undefined ? props.route.params.title : selectedMeal.title)
        props.navigation.setOptions({
            headerTitle: headerTitle,
            headerRight: () => (
                <HeaderButtons HeaderButtonComponent={HeaderButton}>
                    <Item
                        title="Favourite"
                        iconName="ios-star"
                        onPress={() => {
                            console.log('Mark as favorite!');
                        }}
                    />
                </HeaderButtons>
            )
        });
    }, [props.navigation, headerTitle]);


    return (
        <View>
            <Text>The Meal Detail Screen!</Text>
            <Text>{selectedMeal.title}</Text>
            <Button title="Go Back to Categories!" onPress={() => {
                props.navigation.popToTop();
            }} />
        </View>
    )
}

const styles = StyleSheet.create({
});

export default MealDetailScreen;

这是标题按钮的自定义组件。

import React from 'react';
import { Platform } from 'react-native';
import { HeaderButton } from 'react-navigation-header-buttons';
import { Ionicons } from '@expo/vector-icons';

import Colors from '../constants/Colors';

const CustomHeaderButton = props => {
    return (
        <HeaderButton
            {...props}
            IconComponent={Ionicons}
            iconSize={23}
            color={Platform.OS === 'android' ? 'white' : Colors.primaryColor}
        />);
}

export default CustomHeaderButton;

只有标题中的标题显示在 headerRight 中。

<Item
  title="Favourite"
  iconName="ios-star"
  onPress={() => {
  console.log('Mark as favorite!');
  }}
/>

React Native 版本：5 react-navigation-header-buttons 版本：3.0.5

4

4 回答 4

6

问题在于您的组件导入语句。

代替

import { HeaderButton } from '../components/CustomHeaderButton';

类型

import HeaderButton from '../components/CustomHeaderButton';
于 2020-05-04T16:35:43.550 回答
2

我通过 2 个更改解决了同样的问题：

  1. 代替 ：
import { HeaderButton } from '../components/CustomHeaderButton';

键入：

import HeaderButton from '../components/HeaderButton';
  1. 我用箭头函数返回 < HeaderButton > 并将其设置在 headerRight 作为变量 headerRightButton ：
MealDetailScreen.navigationOptions = (navigationData) => {
    const mealId = navigationData.navigation.getParam('mealId');
    const selectedMeal = MEALS.find(meal => meal.id === mealId);
    const headerRightButton = () => {
        return (
            <HeaderButtons HeaderButtonComponent={HeaderButton}>
                            <Item 
                                title= 'Favorite'
                                iconName="ios-star"
                                onPress= {() => {
                                    console.log('Added to favorites');
                                }}
                            />
                            <Item 
                                title= 'Favorite'
                                iconName= "ios-star-outline"
                                onPress= {() => {
                                    console.log('Added to favorites2');
                                }}
                            /> 
                      </HeaderButtons>
        );
    };
    return {
            headerTitle: selectedMeal.title,
            headerRight: (headerRightButton)
        };
};
于 2020-07-19T11:00:55.540 回答
1

我在给出的示例中发现，IconComponentis （无论出于何种原因）没有被传递到Item. 由于 IconComponent 未定义，因此使用了 Text 组件。这个逻辑可以看这里。

我解决这个问题的方法是创建一个自定义组件，该组件将返回HeaderButtons而不是HeaderButton：

import React from 'react';
import { Ionicons } from '@expo/vector-icons';
import Colors from '../constants/colors';
import { Platform } from 'react-native';
import { HeaderButtons, HeaderButton } from 'react-navigation-header-buttons';

const CustomHeaderButton = (props) => (
  <HeaderButton
    IconComponent={Ionicons}
    iconSize={23}
    color={Platform.OS === 'android' ? 'white' : Colors.primaryColor}
    {...props}
  />
);

export const CustomHeaderButtons = (props) => {
  return <HeaderButtons HeaderButtonComponent={CustomHeaderButton} {...props} />;
};
export { Item } from 'react-navigation-header-buttons';

现在你可以像这样使用它：

import { CustomHeaderButtons, Item } from '../components/HeaderButton';
...
MealDetailScreen.navigationOptions = navigationData => {
  const mealId = navigationData.navigation.getParam('mealId');
  const selectedMeal = MEALS.find(meal => meal.id === mealId);
  return {
    headerTitle: selectedMeal.title,
    headerRight: () => (
      <CustomHeaderButtons>
        <Item
          title='Favorite'
          iconName='ios-star'
          onPress={() => { console.log('Marked as favorite!') }}
        />
      </CustomHeaderButtons>
    )
  };
};
于 2020-05-20T05:51:01.890 回答
0

这可能是标题背景颜色的问题。

我的案例：标题按钮出现在 Android 中，但没有出现在 iOS（iPhone）中。

分辨率：更改以下行以应用独立于平台的背景

从

color={Platform.OS === 'android' ? 'white' : Colors.primaryColor}

至

color='white'
于 2021-11-15T03:52:08.553 回答