React Native-分类列表

image.png

RN自学阶段，用FlatList写了一下分类页面，话不多说，直接上代码

/**
 * Created by Rathen on 2018/7/11.
 */


import React, {Component} from 'react';
import {
    Platform,
    StyleSheet,
    Text,
    View,
    Alert,
    FlatList,
    TouchableHighlight,
    Image,
} from 'react-native';

import API from '../Tool/api';//接口文件
import Http from '../Tool/HttpRequest';//用于网络请求，直接替换就行了
import Tool from '../Tool/Tool'//定义了屏幕宽高





export default class Categary extends Component {

    componentDidMount()
    {
        console.log('进入了componentDidMount');
        this.fetchData();//请求网络数据，这里就不在解释了
    }


    static navigationOptions = ({navigation})=>({
        title:'分类',
    });

    state = {//根据各自后台的数据来设定需要的属性
        data:[],//数据数组
        right: [],//选中后右边list的数据数据
        selectedIndex: 0,//第几个选中
        height: 0,
    };


    render() {
        return (
            <View style={{flex: 1}}>
                <View style={{backgroundColor: '#f4f4f4', flex: 1}} onLayout={this.onLayout}>
                        <View style={{height: 0.5, backgroundColor: '#e6e6e6'}}/>
                        <View style={{flexDirection: 'row', width: Tool.width, flex: 1}}>
                            <View style={{width: 90, backgroundColor: '#e6e6e6'}}>
                                <View style={{
                                    alignItems: 'center',
                                    justifyContent: 'center',
                                    backgroundColor: 'white',
                                    height: 45
                                }}>
                                    <Text style={{fontSize: 14, color: '#f60'}}>推荐分类</Text>
                                </View>
                                <FlatList
                                    ref={'left'}
                                    style={{flexGrow: 1}}
                                    data={this.state.data}
                                    keyExtractor={(item, index) => index.toString()}
                                    renderItem={this.renderLeftItem}
                                    showsVerticalScrollIndicator={false}
                                />
                            </View>
                            <FlatList
                                style={{flexGrow: 1}}
                                data={this.state.right}
                                keyExtractor={(item, index) => index.toString()}
                                renderItem={this.renderRightItem}
                                showsVerticalScrollIndicator={false}
                            />
                        </View>
                </View>
            </View>
        );
    }


    onLayout = (event) => {//当组件挂载或者布局变化的时候调用
        let {height} = event.nativeEvent.layout;
        this.setState({height: height})
    };


    renderRightItem = ({item, index}) => (
        <View style={{marginLeft: 10, marginRight: 10,}}>
            <Text style={{
                fontSize: 14,
                color: '#333',
                marginTop: index === 0 ? 10 : 0,
                marginBottom: 10
            }}>{item.category_name}</Text>
            <View style={{backgroundColor: 'white', flex: 1, marginBottom: 10}}>
                <FlatList
                    style={{}}
                    data={item.cateList}
                    numColumns={3}
                    keyExtractor={(item, index) => index.toString()}
                    renderItem={({item, index}) => this.renderLevel3(item)}
                    showsVerticalScrollIndicator={false}
                />
            </View>
        </View>
    );
    renderLevel3 = (item) => (
        <TouchableHighlight underlayColor='#f0f0f0' onPress={() => {
            let url = '';
            switch (item.operation_type) {
                case 1:
                    this.props.navigation.navigate('SearchResultView', {
                        code: item.href, key: item.operation_content
                    });
                    break;
                case 2://专题
                    this.props.navigation.navigate("OtherWebView", {url: Api.WebApi + "/homepage/showView?viewID=" + item.href});
                    break;
                case 3://url
                    this.props.navigation.navigate("OtherWebView", {url: item.href});
                    break;
                case 4:
                    this.props.navigation.navigate('SearchResultView', {
                        key: item.href
                    });
                    break;
            }
        }}>
            <View style={{alignItems: 'center', width: (Tool.width - 110) / 3, marginBottom: 10}}>
                <Image source={{uri: item.category_pic}}
                       style={{height: 65, width: 65, marginTop: 10, marginBottom: 3}}/>
                <Text style={{fontSize: 12, color: "#333"}}>{item.category_name}</Text>
            </View>
        </TouchableHighlight>
    );


    renderLeftItem = ({item, index})  => {
        console.log(item);
        return (
            <View>
                <View style={{height: 0.5, backgroundColor: '#e6e6e6'}}/>
                <TouchableHighlight underlayColor='#ccc' onPress={() => this.onSelected(index)}>
                    <View
                        ref={(ref) => this.selectedView = {...this.selectedView, [`left${index}`]: ref}}
                        style={{
                            alignItems: 'center',
                            justifyContent: 'center',
                            backgroundColor: index === 0 ? '#f60' : 'white',
                            height: 45
                        }}>
                        <Text
                            ref={(ref) => this.selectedText = {...this.selectedText, [`left${index}`]: ref}}
                            style={{
                                fontSize: 14,
                                color: index === 0 ? 'white' : '#333'
                            }}>{item.category_name}</Text>
                    </View>
                </TouchableHighlight>
            </View>
        )
    };


    onSelected = (index) => {
        var length = this.state.data.length;
        for (var i = 0; i < length; i++) {
            if (i === index) {
                this.selectedView['left' + i].setNativeProps({
                    style: {
                        alignItems: 'center',
                        justifyContent: 'center',
                        backgroundColor: '#f60',
                        height: 45
                    }
                });
            } else {
                this.selectedView['left' + i].setNativeProps({
                    style: {
                        alignItems: 'center',
                        justifyContent: 'center',
                        backgroundColor: '#fff',
                        height: 45
                    }
                });
            }
        }
        for (var i = 0; i < length; i++) {
            if (i === index) {
                this.selectedText['left' + i].setNativeProps({
                    style: {
                        fontSize: 14,
                        color: 'white'
                    }
                })
            } else {
                this.selectedText['left' + i].setNativeProps({
                    style: {
                        fontSize: 14,
                        color: '#333'
                    }
                })
            }
        }
        setTimeout(() => {
            this.setState({selectedIndex: index, right: this.state.data[index].cateList});
        }, 50);

    };

     fetchData = async () => {
        console.log('开始网络请求httpRequestUrl');

        try {
                    let response = await Http.get(API.CATEGORY);
                    console.log('分类页面' + response);
                    if (response.data.code == '0000') {
                        this.setState({
                            data: response.data.respBody.list,
                            right: response.data.respBody.list[0].cateList,
                        })
                    } else  {
                        console.log('获取网络请求失败');
                    }
                } catch (err) {
                    console.log('获取网络请求出错了' + err.response);
                }


    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: '#F5FCFF',
    },
    welcome: {
        fontSize: 20,
        textAlign: 'center',
        margin: 10,
    },
    instructions: {
        textAlign: 'center',
        color: '#333333',
        marginBottom: 5,
    },
});