react-native城市列表组件

城市列表选择是很多app共有的功能，比如典型的美图app。那么对于React Native怎么实现呢？

要实现上面的效果，首先需要对界面的组成简单分析，界面的数据主要由当前城市，历史访问城市和热门城市组成，所以我们在提供Json数据的时候就需要将数据分为至少3部分。

const ALL_CITY_LIST = DATA_JSON.allCityList;
const HOT_CITY_LIST = DATA_JSON.hotCityList;
const LAST_VISIT_CITY_LIST = DATA_JSON.lastVisitCityList;

而要实现字母索引功能，我们需要自定义一个控件，实现和数据的绑定关系，自定义组件代码如下：
CityIndexListView.js

'use strict';
import React,{Component} from 'react';
import {
    StyleSheet,View,Text,TouchableOpacity,ListView,Dimensions,} from 'react-native';
 
import Toast,{DURATION} from './ToastUtil'
 
const SECTIONHEIGHT = 30;
const ROWHEIGHT = 40;
const ROWHEIGHT_Box = 40;
var totalheight = []; //每个字母对应的城市和字母的总高度
 
const {width,height} = Dimensions.get('window');
 
var that;
 
const key_now = '当前';
const key_last_visit = '最近';
const key_hot = '热门';
 
export default class CityIndexListView extends Component {
 
    constructor(props) {
        super(props);
 
        var getSectionData = (dataBlob,sectionID) => {
            return sectionID;
        };
        var getRowData = (dataBlob,sectionID,rowID) => {
            return dataBlob[sectionID][rowID];
        };
 
        let ALL_CITY_LIST = this.props.allCityList;
        let CURRENT_CITY_LIST = this.props.nowCityList;
        let LAST_VISIT_CITY_LIST = this.props.lastVisitCityList;
        let HOT_CITY_LIST = this.props.hotCityList;
 
        let letterList = this._getSortLetters(ALL_CITY_LIST);
 
        let dataBlob = {};
        dataBlob[key_now] = CURRENT_CITY_LIST;
        dataBlob[key_last_visit] = LAST_VISIT_CITY_LIST;
        dataBlob[key_hot] = HOT_CITY_LIST;
 
        ALL_CITY_LIST.map(cityJson => {
            let key = cityJson.sortLetters.toUpperCase();
 
            if (dataBlob[key]) {
                let subList = dataBlob[key];
                subList.push(cityJson);
            } else {
                let subList = [];
                subList.push(cityJson);
                dataBlob[key] = subList;
            }
        });
 
        let sectionIDs = Object.keys(dataBlob);
        let rowIDs = sectionIDs.map(sectionID => {
            let thisRow = [];
            let count = dataBlob[sectionID].length;
            for (let ii = 0; ii < count; ii++) {
                thisRow.push(ii);
            }
 
            let eachheight = SECTIONHEIGHT + ROWHEIGHT * thisRow.length;
            if (sectionID === key_hot || sectionID === key_now || sectionID === key_last_visit) {
                let rowNum = (thisRow.length % 3 === 0)
                    ? (thisRow.length / 3)
                    : parseInt(thisRow.length / 3) + 1;
 
                console.log('sectionIDs===>' + sectionIDs + ",rowNum=====>" + rowNum);
 
                eachheight = SECTIONHEIGHT + ROWHEIGHT_Box * rowNum;
            }
 
            totalheight.push(eachheight);
 
            return thisRow;
        });
 
 
        let ds = new ListView.DataSource({
            getRowData: getRowData,getSectionHeaderData: getSectionData,rowHasChanged: (row1,row2) => row1 !== row2,sectionHeaderHasChanged: (s1,s2) => s1 !== s2
        });
 
        this.state = {
            dataSource: ds.cloneWithRowsAndSections(dataBlob,sectionIDs,rowIDs),letters: sectionIDs
        };
 
        that = this;
    }
 
    _getSortLetters(dataList) {
        let list = [];
 
        for (let j = 0; j < dataList.length; j++) {
            let sortLetters = dataList[j].sortLetters.toUpperCase();
 
            let exist = false;
            for (let xx = 0; xx < list.length; xx++) {
                if (list[xx] === sortLetters) {
                    exist = true;
                }
                if (exist) {
                    break;
                }
            }
            if (!exist) {
                list.push(sortLetters);
            }
        }
 
        return list;
    }
 
    _cityNameClick(cityJson) {
        // alert('选择了城市====》' + cityJson.id + '#####' + cityJson.name);
        this.props.onSelectCity(cityJson);
    }
 
    _scrollTo(index,letter) {
        this.refs.toast.close();
        let position = 0;
        for (let i = 0; i < index; i++) {
            position += totalheight[i]
        }
        this._listView.scrollTo({y: position});
        this.refs.toast.show(letter,DURATION.LENGTH_SHORT);
    }
 
    _renderRightLetters(letter,index) {
        return (
            <TouchableOpacity key={'letter_idx_' + index} activeOpacity={0.6} onPress={() => {
                this._scrollTo(index,letter)
            }}>
                <View style={styles.letter}>
                    <Text style={styles.letterText}>{letter}</Text>
                </View>
            </TouchableOpacity>
        );
    }
 
    _renderListBox(cityJson,rowId) {
        return (
            <TouchableOpacity key={'list_item_' + cityJson.id} style={styles.rowViewBox} onPress={() => {
                that._cityNameClick(cityJson)
            }}>
                <View style={styles.rowdataBox}>
                    <Text style={styles.rowDataTextBox}>{cityJson.name}</Text>
                </View>
            </TouchableOpacity>
        );
    }
 
    _renderListRow(cityJson,rowId) {
        console.log('rowId===>' + rowId + ",cityJson====>" + JSON.stringify(cityJson));
        if (rowId === key_now || rowId === key_hot || rowId === key_last_visit) {
            return that._renderListBox(cityJson,rowId);
        }
 
        return (
            <TouchableOpacity key={'list_item_' + cityJson.id} style={styles.rowView} onPress={() => {
                that._cityNameClick(cityJson)
            }}>
                <View style={styles.rowdata}>
                    <Text style={styles.rowdatatext}>{cityJson.name}</Text>
                </View>
            </TouchableOpacity>
        )
    }
 
    _renderListSectionHeader(sectionData,sectionID) {
        return (
            <View style={styles.sectionView}>
                <Text style={styles.sectionText}>
                    {sectionData}
                </Text>
            </View>
        );
    }
 
    render() {
        return (
            <View style={styles.container}>
                <View style={styles.listContainner}>
                    <ListView ref={listView => this._listView = listView}
                              contentContainerStyle={styles.contentContainer} dataSource={this.state.dataSource}
                              renderRow={this._renderListRow} renderSectionHeader={this._renderListSectionHeader}
                              enableEmptySections={true} initialListSize={500}/>
                    <View style={styles.letters}>
                        {this.state.letters.map((letter,index) => this._renderRightLetters(letter,index))} </View> </View> <Toast ref="toast" position='top' positionValue={200} fadeInDuration={750} fadeOutDuration={1000} opacity={0.8}/> </View> ) } } const styles = StyleSheet.create({ container: { // paddingTop: 50,flex: 1,flexDirection: 'column',backgroundColor: '#F4F4F4',},listContainner: { height: Dimensions.get('window').height,marginBottom: 10 },contentContainer: { flexDirection: 'row',width: width,backgroundColor: 'white',justifyContent: 'flex-start',flexWrap: 'wrap' },letters: { position: 'absolute',height: height,top: 0,bottom: 0,right: 10,backgroundColor: 'transparent',// justifyContent: 'flex-start',// alignItems: 'flex-start' alignItems: 'center',justifyContent: 'center' },letter: { height: height * 4 / 100,width: width * 4 / 50,justifyContent: 'center',alignItems: 'center' },letterText: { textAlign: 'center',fontSize: height * 1.1 / 50,color: '#e75404' },sectionView: { paddingTop: 5,paddingBottom: 5,height: 30,paddingLeft: 10,backgroundColor: '#F4F4F4' },sectionText: { color: '#e75404',fontWeight: 'bold' },rowView: { height: ROWHEIGHT,paddingRight: 10,borderBottomColor: '#F4F4F4',borderBottomWidth: 0.5 },rowdata: { paddingTop: 10,paddingBottom: 2 },rowdatatext: { color: 'gray',width: width },rowViewBox: { height: ROWHEIGHT_Box,width: (width - 30) / 3,flexDirection: 'row',backgroundColor: '#ffffff' },rowdataBox: { borderWidth: 1,borderColor: '#DBDBDB',marginTop: 5,marginBottom: 5,paddingBottom: 2,marginLeft: 10,marginRight: 10,rowDataTextBox: { marginTop: 5,height: 20 } });

然后在头部还需要实现一个搜索框。
SearchBox.js

'use strict';
import React,{Component} from 'react';
import {
    View,TextInput,StyleSheet,Platform,} from 'react-native';
 
export default class SearchBox extends Component {
    constructor(props) {
        super(props);
        this.state = {
            value: ''
        };
 
    }
 
    onEndEditingKeyword(vv) {
        console.log(vv);
    }
 
    onChanegeTextKeyword(vv) {
        console.log('onChanegeTextKeyword',vv);
 
        this.setState({value: vv});
        this.props.onChanegeTextKeyword(vv);
    }
 
    render() {
        return (
            <View style={styles.container}>
                <View style={styles.inputBox}>
                    <View style={styles.inputIcon}>
                    </View>
                    <TextInput ref="keyword" autoCapitalize="none" value={this.props.keyword}
                               onChangeText={this.onChanegeTextKeyword.bind(this)} returnKeyType="search" maxLength={20}
                               style={styles.inputText} underlineColorAndroid="transparent"
                               placeholder={'输入城市名或拼音查询'}/>
                </View>
            </View>
        )
    }
}
 
const styles = StyleSheet.create({
    container: {
        marginTop: 5,backgroundColor: '#ffffff',height: Platform.OS === 'ios'
            ? 35
            : 45,borderBottomWidth: StyleSheet.hairlineWidth,borderBottomColor: '#cdcdcd',paddingBottom: 5
    },inputBox: {
        height: Platform.OS === 'ios'
            ? 30
            : 40,marginLeft: 5,marginRight: 5,backgroundColor: '#E6E7E8'
    },inputIcon: {
        margin: Platform.OS === 'ios'
            ? 5
            : 10
    },inputText: {
        alignSelf: 'flex-end',marginTop: Platform.OS === 'ios'
            ? 0
            : 0,height: Platform.OS === 'ios'
            ? 30
            : 40,marginLeft: 2,fontSize: 12,lineHeight: 30,textAlignVertical: 'bottom',textDecorationLine: 'none'
    }
});

最终效果：

最后是界面的绘制，这里就不多说了，大家可以下载源码自行查看。源码地址：http://download.csdn.net/detail/xiangzhihong8/9905924

react-native城市列表组件

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