[RN] React Native 让 Flatlist 支持 选中多个值，并获取所选择的值

React Native 让 Flatlist  支持  选中多个值，并获取所选择的值

实现效果如下：

 

实现代码：

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

export default class TestListCheck extends Component {
    constructor(props) {
        super(props);
        this.state = {
            data: [
                {
                    "id": "0",
                    select: false
                },
                {
                    "id": "1",
                    select: false
                },
                {
                    "id": "2",
                    select: false
                },
                {
                    "id": "3",
                    select: false
                },
                {
                    "id": "4",
                    select: false
                },
                {
                    "id": "5",
                    select: false
                }
            ],//数据源
            selectItem: [],
        }
    }

    _selectItemPress(item) {
        if (item.select) {
            this.state.selectItem.splice(this.state.selectItem.findIndex(function (x) {
                return x === item.id;
            }), 1);
        } else {
            this.state.selectItem.push(item.id);
        }
        this.state.data[item.id].select = !item.select;
        this.setState({data: this.state.data})
    }

    _submitPress() {
        alert(`选中了${JSON.stringify(this.state.selectItem)}`)
    }

    render() {
        return (
            <FlatList
                keyExtractor={item => item.id}
                data={this.state.data}
                extraData={this.state} //这里是关键，如果不设置点击就不会马上改变状态，而需要拖动列表才会改变
                ListHeaderComponent={({item}) => {
                    return (<Button title={"确定"} onPress={() => this._submitPress()}/>)
                }}
                renderItem={({item}) => {
                    return (
                        <View style={styles.standaloneRowFront}>

                            <TouchableOpacity
                                onPress={() => this._selectItemPress(item)}>
                                <View style={styles.row}>
                                    {item.select ?
                                        <Image source={require('./ic_radio_checkbox_check.png')}
                                               style={styles.imgCheckIcon}/>
                                        :
                                        <Image source={require('./ic_radio_checkbox_uncheck.png')}
                                               style={styles.imgCheckIcon}/>
                                    }
                                    <View style={{marginLeft: 20}}>
                                        <Text>{item.select ? ("选中") : ("未选中")}</Text>
                                    </View>
                                </View>
                            </TouchableOpacity>

                        </View>
                    )
                }}
            />
        );
    }
}
const styles = StyleSheet.create({
    standaloneRowFront: {
        flexDirection: 'row',
        alignItems: 'center',
        backgroundColor: '#FFF',
        height: 70,
        marginBottom: 5
    },
    imgCheckIcon: {
         24,
        height: 24,
        lineHeight: 24,
    },
    row: {
        flexDirection: "row",
        alignItems: "center",
    },
});

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本文原文地址：https://www.cnblogs.com/wukong1688/p/11080603.html

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