我在React中显示一些数据。我从localStorage读取这些数据并在FlatList中显示。数据在数组中，但没有显示。

cartItems是包含此数据的数组，此数组将传递给FlatList。

cartItems = [{"food":"bread","foodPrice":"Rs. 100"},{"food":"bread","foodPrice":"Rs. 100"}, 
{"food":"bread","foodPrice":"Rs. 100"},{"food":"bread","foodPrice":"Rs. 100"}, 
{"food":"bread","foodPrice":"Rs. 100"}]

但没有显示任何数据。
Cart.js:

import React from "react";
import {
    StyleSheet,
    FlatList,
    View,
    Image,
    TouchableOpacity,
    Text
} from "react-native";

export default class Cart extends React.Component {
    constructor() {
        super();
        this.state = {
            cartItems: []            
        };

        let orderArray = localStorage.getItem("Foods") // Get previously stored food items
        
        let cartItems = []
        if (orderArray !== null) {
            //cartItems = [...JSON.parse(orderArray)]
            this.setState({cartItems: [...JSON.parse(orderArray)]})
        }
        
        console.log("Cart: cartItems = "+JSON.stringify(cartItems));
    }

    renderItemComponent = (data) =>
        <TouchableOpacity style={styles.container}>
            <Image style={styles.image} source={{ uri: data.item.url }} />
        </TouchableOpacity>

    ItemSeparator = () => <View style={{
        height: 2,
        backgroundColor: "rgba(0,0,0,0.5)",
        marginLeft: 10,
        marginRight: 10,
    }}
    />


    render() {
        return (
            <View>
                <FlatList
                    data={this.state.cartItems}
                    renderItem={({ item }) =>
                    
                        <TouchableOpacity >
                            <Text >{item.food}</Text>
                            <Text >{item.foodPrice}</Text>
                        </TouchableOpacity>
                    }
                    ItemSeparatorComponent={this.ItemSeparator}

                />
            </View>)     
    }
}

const styles = StyleSheet.create({
    container: {
        height: 300,
        margin: 10,
        backgroundColor: '#FFF',
        borderRadius: 6,
    },
    image: {
        height: '100%',
        borderRadius: 4,
    },
});

这个问题的根本原因可能是什么。看起来，有很小的问题，但还没能找到。