反应原生 Flatlist 导航

我收到错误 类型错误：无法读取未定义的属性“导航”。我不明白如何将导航组件传递给每个子组件，因此当用户按下某个项目时，它可以使用 React Navigation 导航到 employeeEdit 组件。我是新手，如果这是显而易见的，我很抱歉。

import React, { Component } from 'react';
import { FlatList } from 'react-native';
import { connect } from 'react-redux';
//import { R } from 'ramda';
import _ from 'lodash';
import { employeesFetch } from '../actions';
import { HeaderButton } from './common';
import ListEmployee from './ListEmployee';


class EmployeeList extends Component {
  static navigationOptions = ({ navigation }) => ({
    headerRight: (
      <HeaderButton onPress={() => navigation.navigate('employeeCreate')}>
        Add
      </HeaderButton>
    )
  });

  componentWillMount() {
    this.props.employeesFetch();
  }

  keyExtractor(item) {
    return item.uid;
  }
  renderItem({ item }) {
    return <ListEmployee employee={item} navigation={this.props.navigation} />;
  }
  render() {
    return (
      <FlatList
      data={this.props.employees}
      renderItem={this.renderItem} // Only for test
      keyExtractor={this.keyExtractor}
      navigation={this.props.navigation}
      />
    );
  }
}
const mapStateToProps = (state) => {
  const employees = _.map(state.employees, (val, uid) => ({ ...val, uid }));
  return { employees };
};

export default connect(mapStateToProps, { employeesFetch })(EmployeeList);

这是 ListEmployee 的代码

import React, { Component } from 'react';
import {
  Text,
  StyleSheet,
  TouchableWithoutFeedback,
  View
} from 'react-native';
import { CardSection } from './common';

class ListEmployee extends Component {

  render() {
  const { employee } = this.props;
  const { navigate } = this.props.navigation;
  const { textStyle } = styles;
  const { name } = this.props.employee;
    return (
      <TouchableWithoutFeedback onPress={() => navigate('employeeEdit', { employee })}>
        <View>
          <CardSection>
            <Text style={textStyle}>{name}</Text>
          </CardSection>
        </View>
      </TouchableWithoutFeedback>
    );
  }
}

/**
 second argument in connect does 2 things. 1.  dispatches all actions creators
return action objects to the store to be used by reducers; 2. creates props
of action creators to be used by components
**/
export default ListEmployee;

const styles = StyleSheet.create({
  textStyle: {
    fontSize: 18,
    paddingLeft: 15,
  }
});

这是 ES6 常见的陷阱之一。别担心我的朋友，你只需学习一次就可以再次避免它们。

长话短说，当你在 React Component 中声明一个方法时，将其设置为箭头函数

所以，要从这个开始改变。

renderItem({ item }) {

to this

renderItem = ({ item }) => {

这应该可以解决您的问题，由于某些不方便的原因，如果您将方法声明为箭头函数，则只能访问“this”，但不能使用普通声明。

在您的情况下，由于 renderItem 不是箭头函数，因此“this”不引用反应组件，因此“this.props”可能是未定义的，这就是它给您这个错误的原因Cannot read property 'navigation' of undefined since

this.props.navigation = (undefined).navigation