如何在React Native中的另一个组件下创建顶部导航选项卡

Question

我使用的是react导航版本5，目前，我在一个位于SafeAreaView顶部的视图中有一个带有文本和按钮的屏幕，我需要在该视图下方添加TopTabNavigator。

这是代码：

TimelineComponent.js

import React from 'react';
import PropTypes from 'prop-types';
import {ScrollView, Text} from 'react-native';
class TimelineComponent extends React.PureComponent {
render() {
return (
<ScrollView>
<Text>Timeline</Text>
</ScrollView>
);
}
}
export default TimelineComponent;

TrendingComponent.js

import React from 'react';
import PropTypes from 'prop-types';
import {ScrollView, Text} from 'react-native';
class TrendingComponent extends React.PureComponent {
render() {
return (
<ScrollView>
<Text>Trending</Text>
</ScrollView>
);
}
}
export default TrendingComponent;

TopNav.js

import React from 'react';
import {createMaterialTopTabNavigator} from '@react-navigation/material-top-tabs';
import TimelineComponent from '../TimelineComponent';
import TrendingComponent from '../TrendingComponent';
const Tab = createMaterialTopTabNavigator();
export function TopNav() {
return (
<Tab.Navigator>
<Tab.Screen name="Timeline" component={TimelineComponent} />
<Tab.Screen name="Trending" component={TrendingComponent} />
</Tab.Navigator>
);
}

WallFragmentComponent.js

import React from 'react';
import PropTypes from 'prop-types';
import Icon from 'react-native-vector-icons/FontAwesome';
import {
Keyboard,
SafeAreaView,
StyleSheet,
Text,
TouchableOpacity,
TouchableWithoutFeedback,
View,
} from 'react-native';
import {TopNav} from './TopNav';
const styles = StyleSheet.create({
container: {
padding: 20,
},
header_container: {
backgroundColor: 'white',
alignItems: 'center',
display: 'flex',
flexDirection: 'row',
justifyContent: 'space-between',
},
header_text: {
fontSize: 30,
fontWeight: '500',
},
new_chat_button: {
alignItems: 'center',
borderColor: 'blue',
borderWidth: 1,
borderRadius: 12,
display: 'flex',
flexDirection: 'row',
paddingHorizontal: 22,
paddingTop: 6,
paddingVertical: 6,
},
top_nav: {
marginVertical: 20,
},
});
class WallFragmentComponent extends React.PureComponent {
constructor(props) {
super(props);
this.state = {
input: {},
secureTextEntry: true,
};
}
handleInput = (name, value) => {
this.setState({
input: {...this.state.input, [name]: value},
});
};
render() {
return (
<View style={{backgroundColor: 'white'}}>
<SafeAreaView>
<TouchableWithoutFeedback
onPress={Keyboard.dismiss}
accessible={false}>
<View style={styles.container}>
<View style={styles.header_container}>
<Text style={styles.header_text}>Wall</Text>
<TouchableOpacity style={styles.new_chat_button}>
<Icon name="comment" style={{marginEnd: 6, color: 'blue'}} />
<Text style={{fontWeight: '500', color: 'blue'}}>
New Post
</Text>
</TouchableOpacity>
</View>
</View>
</TouchableWithoutFeedback>
<View style={styles.top_nav}>
<TopNav />
</View>
</SafeAreaView>
</View>
);
}
}
export default WallFragmentComponent;

在WallFragmentComponent.js文件中，我已经将<TopNav />放置在视图中，但在运行项目时它不会进行渲染。这是屏幕截图：屏幕截图

如何在"墙文本"one_answers"新建帖子"按钮下添加顶部导航？任何帮助都将不胜感激。

谢谢，问候

Answer 1

这可能有助于

// TopNav.js

const Tab = createMaterialTopTabNavigator();
const AppNavigator = () => {
return (
<Tab.Navigator>
<Tab.Screen name="Timeline" component={TimelineComponent} />
<Tab.Screen name="Trending" component={TrendingComponent} />
</Tab.Navigator>
)
}

export default AppNavigator;

WallFragmentComponent.js

import AppNavigator from './AppNavigator';
...........
const TopNav = createAppContainer(AppNavigator);
class WallFragmentComponent extends React.PureComponent { 
......
render() {
return (
<View style={{backgroundColor: 'white'}}>
......
<TopNav />
......
</View>
);
}
}

您还可以使用react原生可滚动选项卡视图

Answer 2

好吧，我终于找到了解决方案：

1. 将第一个<View ... />元素更改为<SafeAreaView style={{flex: 1}} />，然后一切正常

WallFragmentComponent.js

import React from 'react';
import PropTypes from 'prop-types';
import Icon from 'react-native-vector-icons/FontAwesome';
import {
Keyboard,
SafeAreaView,
StyleSheet,
Text,
TouchableOpacity,
TouchableWithoutFeedback,
View,
} from 'react-native';
import {TopNav} from './TopNav';
const styles = StyleSheet.create({
container: {
padding: 20,
},
header_container: {
backgroundColor: 'white',
alignItems: 'center',
display: 'flex',
flexDirection: 'row',
justifyContent: 'space-between',
},
header_text: {
fontSize: 30,
fontWeight: '500',
},
new_chat_button: {
alignItems: 'center',
borderColor: 'blue',
borderWidth: 1,
borderRadius: 12,
display: 'flex',
flexDirection: 'row',
paddingStart: 22,
paddingEnd: 22,
paddingTop: 6,
paddingBottom: 6,
},
top_nav: {
marginTop: 20,
},
});
class WallFragmentComponent extends React.PureComponent {
constructor(props) {
super(props);
this.state = {
input: {},
secureTextEntry: true,
};
}
handleInput = (name, value) => {
this.setState({
input: {...this.state.input, [name]: value},
});
};
render() {
return (
<SafeAreaView style={{flex: 1, backgroundColor: 'white'}}>
<TouchableWithoutFeedback onPress={Keyboard.dismiss} accessible={false}>
<View style={styles.container}>
<View style={styles.header_container}>
<Text style={styles.header_text}>Wall</Text>
<TouchableOpacity style={styles.new_chat_button}>
<Icon name="comment" style={{marginEnd: 6, color: 'blue'}} />
<Text style={{fontWeight: '500', color: 'blue'}}>
{' '}
New Post
</Text>
</TouchableOpacity>
</View>
</View>
</TouchableWithoutFeedback>
<TopNav />
</SafeAreaView>
);
}
}
export default WallFragmentComponent;

屏幕截图

这就是