当我单击平面列表中的某一项时，我试图导航到另一个屏幕。

我这里的代码已经工作了几天，但现在不行了，当应用程序加载时，EventDetailScreen 在我单击任何平面列表项之前就打开了，然后当我按下 EventDetailScreen 的后退按钮时，我会回到 EventListScreen，如果我单击任何列表项，什么都不会发生，我也不会进入 EventDetailScreen。

我也收到错误：

Warning: Cannot update during an existing state transition (such as within render or another component's constructor). Render methods should be a pure function of props and state; constructor side-effects are an anti-pattern, but can be moved to componentWillMount .

我是 React Native 的新手，所以任何帮助都将不胜感激！

我正在使用： “react-navigation”：“^2.7.0”， “react”：“16.4.1”， “react-native”：“0.56.0”，

我使用了这个答案 导航到 FlatList 中的每个项目 来使其正常工作最初。

EventListScreen.js

export default class EventListScreen extends Component {

constructor() {
    super();
    this.ref = firebase.firestore();
    this.unsubsribe = null;

    this.state = {
        eventName: '',
        eventLocation: '',
        loading: true,
        events: [],
    };
}

componentDidMount() {
    console.log('EventsListScreen1');
    this.unsubsribe = this.ref.onSnapshot(this.onCollectionUpdate)
}

componentWillUnmount() {
    this.unsubsribe();
}


openDetails = () => {
    this.props.navigation.navigate('EventDetailScreen');
};

render() {

    if (this.state.loading) {
        return null;
    }

    return (
        <Container>

            <FlatList
                data={this.state.events}
                // Get the item data by referencing as a new function to it
                renderItem={({item}) =>
                    <Event
                    openDetails={() => this.openDetails()}
                    {...item} />}
            />

            <View style={{flex: 1}}>
                <Fab
                    active={this.state.active}
                    direction="left"
                    containerStyle={{}}
                    style={{backgroundColor: '#5067FF'}}
                    position="bottomRight"
                    onPress={() => 
                    this.props.navigation.navigate('EventForm')
                    }>
                    <Icon 
                       name="ios-add"/>
                </Fab>
            </View>

        </Container>
    );
}

Event.js

export default class Event extends Component {

render() {

    return (
        <Card>
            <CardSection>
                <Text>{this.props.eventName}</Text>
            </CardSection>

            <TouchableOpacity
              onPress={this.props.openDetails()}
            >
            <CardSection>
                <Image
                    style={{
                       width: 350,
                       height: 300
                    }}
                    source={{
                       uri: this.props.imageDownloadUrl
                    }}
                />
            </CardSection>

            <CardSection>
                <Text>{this.props.eventLocation}</Text>
            </CardSection>
            </TouchableOpacity>
        </Card>
    );
}};

EventDetailScreen.js

export default class EventDetailScreen extends Component {
render() {
    /* 2. Get the param, provide a fallback value if not available */
    const { navigation } = this.props;
    const itemId = navigation.getParam('itemId', 'NO-ID');

    return (
        <View 
           style={{ 
              flex: 1,
              alignItems: 'center',
              justifyContent: 'center' 
            }}>
            <Text>Details Screen</Text>
        </View>
    );
}}