反应原生：选取器无法选择任何其他项目。错误：操作可能没有未定义的"type"属性。你拼错常量了吗？

Question

我正在学习 React Native，但我被困在一个 Picker 问题上。单击它时会显示，但我无法选择"星期一"以外的任何其他内容。每当我这样做时，我都会收到一个错误

我尝试在互联网上搜索问题并与我的动作创作者合作，但似乎没有任何效果

import React, { Component } from 'react';
import { Picker, Text } from 'react-native';
import { connect } from 'react-redux';
import { employeeUpdate } from '../actions';
import { Card, CardSection, Input, Button } from './common';
class EmployeeCreate extends Component {
    render() {
        return (
            <Card>
                <CardSection>
                    <Input
                        label='Name'
                        placeholder='Jane'
                        value={this.props.name}
                        onChangeText={value => this.props.employeeUpdate({ prop: 'name', value })}
                    />
                </CardSection>
                <CardSection>
                    <Input
                        label='Phone'
                        placeholder='555-555-5555'
                        value={this.props.phone}
                        onChangeText={value => this.props.employeeUpdate({ prop: 'phone', value })}
                    />
                </CardSection>
                <CardSection style={{ flexDirection: 'column' }}>
                    <Text style={styles.pickerTextStyle}>Shift</Text>
                    <Picker
                        style={{ alignItems: "center" }}
                        selectedValue={this.props.shift}
                        onValueChange={value => this.props.employeeUpdate({ prop: 'shift', value })}
                    >
                        <Picker.Item label="Monday" value="Monday" />
                        <Picker.Item label="Tuesday" value="Tuesday" />
                        <Picker.Item label="Wednesday" value="Wednesday" />
                        <Picker.Item label="Thursday" value="Thursday" />
                        <Picker.Item label="Friday" value="Friday" />
                        <Picker.Item label="Saturday" value="Saturday" />
                        <Picker.Item label="Sunday" value="Sunday" />
                    </Picker>
                </CardSection>
                <CardSection>
                    <Button>Create</Button>
                </CardSection>
            </Card>
        );
    }
}
const styles = {
    pickerTextStyle: {
        fontSize: 18,
        paddingLeft: 20
    }
};
const mapStateToProps = (state) => {
    const { name, phone, shift } = state.employeeForm;
    return { name, phone, shift };
};
export default connect(mapStateToProps, { employeeUpdate })(EmployeeCreate);

这是我的员工行动文件：

import EMPLOYEE_UPDATE from './types'
export const employeeUpdate = ({ prop, value }) => {
    return {
        type: EMPLOYEE_UPDATE,
        payload: { prop, value }
    };
};

以下是EmployeeFormReducer：

import EMPLOYEE_UPDATE from '../actions/types';
const INITIAL_STATE = { name: '', phone: '', shift: '' };
export default (state = INITIAL_STATE, action) => {
    switch (action.type) {
        case EMPLOYEE_UPDATE:
            //action.payload === { prop: 'name', value: 'jane' }
            return { ...state, [action.payload.prop]: action.payload.value };
        default:
            return state;
    }
}

我希望根据我的选择选择任何一天

Answer 1

已解决。对类型.js文件进行了一些更改：

export const EMAIL_CHANGED = 'email_changed';
export const PASSWORD_CHANGED = 'password_changed';
export const LOGIN_USER_SUCCESS = 'login_user_success';
export const LOGIN_USER_FAIL = 'login_user_fail';
export const LOGIN_USER = 'login_user';
export const EMPLOYEE_UPDATE = 'employee_update';
export default {
    EMAIL_CHANGED,
    PASSWORD_CHANGED,
    LOGIN_USER_SUCCESS,
    LOGIN_USER_FAIL,
    LOGIN_USER,
    EMPLOYEE_UPDATE
}