我正在使用 react-navigation 版本 3,我有底部选项卡导航器,有 4 个选项卡。
其中一个是聊天屏幕,称为Chat
,包含两个 View :
当点击注册或登录时,它将进入相应的屏幕进行登录或登录。
但是当我单击
Chat
上的底部选项卡导航器时,从登录/登录页面,它应该再次重新加载并检查用户是否已登录?问题是当我从我的选项卡导航到登录/登录页面时,它没有刷新或再次调用或重新安装。
class ChatScreen extends React.Component {
constructor(props) {
super(props);
this.state = {
loading: true,
refreshing: false
}
this.onRefresh = this.onRefresh.bind(this);
let WebViewRef;
}
componentDidMount() {
this.didFocusListener = this.props.navigation.addListener(
'didFocus',
() => {
console.log('bottom tab navigator is called');
},
);
if (this.props.userInfo) {
this.get_access_token()
}
else {
console.log("! this.props.userInfo ")
}
}
render() {
if (this.props.userInfo && this.state.access_token)
return (
<SafeAreaView style={{ flex: 1 }}>
<ScrollView
contentContainerStyle={{ flex: 1 }}
refreshControl={<RefreshControl refreshing={this.state.refreshing} onRefresh={this.onRefresh} />}
>
<View style={{ flex: 1 }}>
<WebView
source={{ uri: 'my-demosite-anywebsite.com?access_token=' + this.state.access_token }}
onLoad={() => this.setState({ loading: false })}
ref={WebViewRef => (this.WebViewRef = WebViewRef)}
/>
</View>
</ScrollView>
</SafeAreaView>
)
else if (!this.props.userInfo) {
return <MyCompanyLogoScreen />
}
else {
return <LoadingScreen />
}
}
}
class MyCompanyLogoScreen extends React.Component{
render() {
return (
<View style={styles.container}>
{
!this.state.request_to_login ?
<View> <MyCompanyLogoScreenAllComponents/>
<Button
bgColor="#4cd137"
textColor="#FFFFFF"
secondary
rounded
style={{ alignSelf: 'stretch', marginTop: hp(5),
width: '35%', marginRight: wp(6) }}
caption={'LOGIN UP'}
onPress={() =>
this.navigateToLoginScreen(redirect_to_signup_or_login
= "login")
}
/>
</View>
}
我的问题是当我在底部TabNavigator 的标签上点击
Chat
时如何刷新整个组件?didFocus 也不起作用。
最佳答案
您可以使用 高阶组件通过专注 支撑成一个包装的组件。例子:
import { withNavigationFocus } from 'react-navigation';
class TabLabel extends React.Component {
componentDidUpdate(prevProps) {
if (prevProps.isFocused !== this.props.isFocused) {
//Call any action to update you view
//fetch data when the component is focused
//To prevent extra component re-renders, you may need to write some logic in shouldComponentUpdate
}
}
render() {
return <Text>{this.props.isFocused ? 'Focused' : 'Not focused'}</Text>;
}
}
// withNavigationFocus returns a component that wraps TabLabel and passes
// in the navigation prop
export default withNavigationFocus(TabLabel);
关于javascript - 在 React Native 中,在 React Navigation v3 中单击 bottomTabNavigator 上的选项卡时,如何刷新我的组件?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59676041/