ScrollView 里面有循环 Not Scrolling React Native

Question

我在 ScrollView 中运行一个循环，但没有明显的原因它不滚动。我已经阅读了他们设置 flex:1 或 flexGrow:1 的其他帖子，我尝试过但它仍然不起作用。

我正在使用 expo 在我的 android 设备上运行应用程序。

fooditems.js

import React from "react";
import { View, Text, StyleSheet, ScrollView } from "react-native";
import { Divider, Image } from "react-native-elements";

const foods = [
  {
    title: "chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur,  recusandae error amet cum doloremque mollitia hic, porro autem qui libero fugit atque.",
    image:
      "some image link",
    price: "$ 10.99",
  },
  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },
  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },
];
export default function MenuItems() {
  return (
    <ScrollView>
      {foods.map((food, index) => (
        <View key={index}>
          <View style={styles.menuItemStyle}>
            <FoodInfo food={food} />
            <FoodImage food={food} />
          </View>
          <Divider width={0.5} />
        </View>
      ))}
    </ScrollView>
  );
}

const styles = StyleSheet.create({
  menuItemStyle: {
    flexDirection: "row",
    justifyContent: "space-between",
    margin: 20,
  },
  titleStyle: {
    fontSize: 19,
    fontWeight: "600",
  },
});

我不太清楚为什么会这样，但在 ios 上似乎没有这样的问题。

编辑：与 FlatList 相同的代码，但它仍然不会滚动。

export default function MenuItems() {
  const renderItem = ({ item }) => (
    <View>
      <View style={styles.menuItemStyle}>
        <FoodInfo food={item} />
        <FoodImage food={item} />
      </View>
      <Divider
        width={0.5}
        orientation="vertical"
        style={{ marginHorizontal: 20 }}
      />
    </View>
  );
  return (
    <View>
      <FlatList
        data={foods}
        renderItem={renderItem}
        keyExtractor={(item) => item.id}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  menuItemStyle: {
    flexDirection: "row",
    justifyContent: "space-between",
    margin: 20,
  },
  titleStyle: {
    fontSize: 19,
    fontWeight: "600",
  },
});
const FoodInfo = (props) => (
  <View style={{ width: 240, justifyContent: "space-between" }}>
    <Text style={styles.titleStyle}>{props.food.title}</Text>
    <Text>{props.food.description}</Text>
    <Text>{props.food.price}</Text>
  </View>
);

const FoodImage = (props) => (
  <View>
    <Image
      source={{ uri: props.food.image }}
      style={{ width: 100, height: 100, borderRadius: 9 }}
    />
  </View>
);

Answer 1

导入 FoodInfo 和 FoodImage

我建议你使用 FlatList 而不是滚动视图，bcz 大量数据（JSON）只能由 flatlist 顺利处理，将来如果你使用 Any api 请求数据，那么最好使用 flatlist

您可以选择水平重绘视图访问https://reactnative.dev/docs/flatlist

example
import React from 'react';
import {View, FlatList, StyleSheet, Text} from 'react-native';

const Foods = [
  {
    title: "chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur,  recusandae error amet cum doloremque mollitia hic, porro autem qui libero fugit atque.",
    image:
      "some image link",
    price: "$ 10.99",
  },
  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },
  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },
];

const App = () => {
  const renderItem = ({ item }) => (
      <View style={styles.container}>    
      <Text style={styles.title}>{item.title}</Text>
      <Text>{item.description}</Text>
      <Text>{item.image}</Text>
      <Text>{item.price}</Text>
     <View style={{width: "100%", backgroundColor: 'white', height:   
      3,}}/>
      </View>
  );

  return (
   <View >
      <FlatList
        data={Foods}
        renderItem={renderItem}
        keyExtractor={item => item.id}
      />
   </View>
  );
}

const styles = StyleSheet.create({
  container: {
    borderRadius: 10,
    backgroundColor: 'gray'
  },
  title: {
    fontSize: 32,
  },
});

export default App;

Answer 2

如果您的项目结构相似，请始终推荐使用 FlatList。 它将优化内存使用。 Flatlist documentation

但如果您仍想使用 ScrollView，请使用此代码。这是有效的。

import React from 'react';
import { ScrollView, View, StyleSheet, Text } from 'react-native';
import { Divider, Image } from "react-native-elements";

const foods = [
  {
    title: "chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur,  recusandae error amet cum doloremque mollitia hic, porro autem qui libero fugit atque.",
    image:
      "some image link",
    price: "$ 10.99",
  },
  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },
  {
    title: "barbecued chicken",
    description:
      "Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eaque quis quam architecto. ",
    image:
      "some image link",
    price: "$ 14.99",
  },
];

const MenuItems = () => {
  return (
    <ScrollView>
      {foods.map((food, index) => (
        <View key={index}>
          <View style={styles.menuItemStyle}>
            <Text style={styles.titleStyle}>{food.description}</Text>
            <Text style={styles.titleStyle}>{food.price}</Text>
          </View>
          <Divider width={0.5} />
        </View>
      ))}
    </ScrollView>
  );
}

const styles = StyleSheet.create({
  menuItemStyle: {
    flexDirection: "row",
    justifyContent: "space-between",
    margin: 20,
  },
  titleStyle: {
    fontSize: 19,
    fontWeight: "600",
  },
});

export default MenuItems;