React Native性能优化:从渲染到网络
import React, { PureComponent } from 'react';
import { FlatList, View, Text, Image } from 'react-native';
// 优化后的网络请求函数
import { fetchArticles } from './api';
export default class ArticleList extends PureComponent {
state = { articles: [], refreshing: false };
componentDidMount() {
this.fetchArticles();
}
fetchArticles = async () => {
this.setState({ refreshing: true });
const articles = await fetchArticles();
this.setState({ articles, refreshing: false });
};
renderItem = ({ item }) => (
<View style={{ flexDirection: 'row', alignItems: 'center' }}>
<Image source={{ uri: item.author.avatar }} style={{ width: 40, height: 40 }} />
<View style={{ marginLeft: 10 }}>
<Text>{item.title}</Text>
<Text>{item.content}</Text>
</View>
</View>
);
render() {
return (
<FlatList
data={this.state.articles}
renderItem={this.renderItem}
keyExtractor={item => item.id}
onRefresh={this.fetchArticles}
refreshing={this.state.refreshing}
/>
);
}
}
这个代码示例展示了如何优化网络请求函数,并在React Native组件中正确地使用FlatList
以及如何通过PureComponent
来提高渲染性能。这是一个简化的例子,但它展示了如何将网络请求和渲染性能的最佳实践结合在一起。
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