ReactNative 城市列表选择 字母 先上效果图
- 右侧字母选择器 高度问题,
- 右侧字母选择器 如何使用手势检测panresponse
- 右侧字母选择器 计算高度如何判断是触摸到那个字母上的(思考 如果是==native应用是如何做的==...刚看过 native应用的城市列表也是通过计算每个字母的高度来检测的)动态创建的控件
右边滑动的原理: 通过onlayout计算每个字母高度
,然后加入数组 , 手指触摸字母列表时 知道 触摸的y坐标
这样再减去列表距离顶部的距离 就是字母列表的初始坐标.根据
y坐标和刚才通过onlayout计算出的数组进行比对在那个区间则是
哪一个字母的item
下面上代码
/**
* Created by liuml on 2017/10/5.
*/
import React, {Component} from 'react';
import {
View,
Image,
TouchableOpacity,
Modal,
Text,
StatusBar,
ListView,
Platform,
Dimensions,
StyleSheet,
RefreshControl,
Alert,
TextInput,
PanResponder
} from 'react-native';
import _ from 'lodash';
import NavigationBar from './compont/NavigationBar'
const {width, height} = Dimensions.get('window')
const SECTIONHEIGHT = 30, ROWHEIGHT = 40
//这是利用lodash的range和数组的map画出26个英文字母
var Util = require('./util/util');//工具类
var ScreenUtil = require('./util/ScreenUtil');//工具类
let city = [];//城市的数组 里面放的是对象
var totalheight = [];//每个字母对应的城市和字母的总高度 比如所有a字母中数据的高度
var lettersItemheight = [];//每个字母的y坐标
var myLetters = [];//我的字母数组
var myDataBlob = {};//获取到的数据
var lettersBottom = 10;//字母列表距离底部高度
var mySectionIDs = []; //组id
var myRowIDs = [];//组内
var cityData = [];//获取到的数据
var totalNumber = 10;//总条数的数据
var searchHeight = 35;//搜索框高度
var searchHeightMargin = 2;//搜索框margin
var lettersHeight;//字母列表高度
var that ;
export default class CityList extends Component {
constructor(props) {
super(props);
// 获取组中数据
var getSectionData = (myDataBlob, mySectionIDs) => {
// console.log("组id mySectionIDs = " + mySectionIDs);
// console.log(`组中数据 = ${myDataBlob[mySectionIDs]}`);
return myDataBlob[mySectionIDs];
};
// 获取行中的数据
var getRowData = (myDataBlob, mySectionIDs, myRowIDs) => {
// console.log(`行中数据 = ${myDataBlob[myRowIDs]}`);
return myDataBlob[myRowIDs];
};
this.state = {
dataSource: new ListView.DataSource({
getSectionHeaderData: getSectionData,
getRowData: getRowData,
rowHasChanged: (row1, row2) => row1 !== row2,
sectionHeaderHasChanged: (s1, s2) => s1 !== s2,
}),
isLoading: true,
lettersShow: true
}
that = this;
}
//加载数据
loadData = () => {
// var thiz = this;
Util.post('http://ovji4jgcd.bkt.clouddn.com/Mycity.json', {},
(ret) => {
// console.log(ret);
if (ret.resCode == 1 && ret.data.length > 0) {
cityData = ret.data;
// console.log(cityData);
totalNumber = ret.totalNumber;
//一系列的操作 遍历数组
console.log("正确的总数据: " + cityData);
this.setData(cityData);
}
});
}
//设置数据
setData = (cityData) => {
for (let i = 0; i < cityData.length; i++) {
var mysectionName = 'Section_' + i;
let cityMode = cityData[i].data;
let zimu = cityData[i].zimu;
mySectionIDs.push(mysectionName)
myRowIDs[i] = [];
var innerLoop = cityData[i].data; //内循环中的城市
myDataBlob[mysectionName] = zimu;//把字母放入总数据
myLetters.push(zimu)//把字母放入用于右边的字母列表
for (let jj = 0; jj < innerLoop.length; jj++) {
let rowName = i + '_' + jj;
myRowIDs[i].push(rowName);
myDataBlob[rowName] = innerLoop[jj];
}
//组的高度 + 上行的高度 * 有多少行
var eachheight = SECTIONHEIGHT + ROWHEIGHT * cityMode.length
totalheight.push(eachheight)
}
let size = myLetters.length;
// console.log("字母数量" + size);
// console.log("lettersHeight = " + lettersHeight);
//关闭对话框 设置数据源
// console.log("打印setstate===================")
this.setState({
dataSource: this.state.dataSource.cloneWithRowsAndSections(myDataBlob, mySectionIDs, myRowIDs),
isLoading: false,
lettersShow: true
})
}
//更新数据
updateData = (cityData) => {
console.log("更新的数据: " + cityData);
let myDataBlob = [], mySectionIDs = [], myRowIDs = [];
for (let i = 0; i < cityData.length; i++) {
let mysectionName = 'Section_' + i;
// let cityMode = cityData[i].data;
let zimu = cityData[i].zimu;
mySectionIDs.push(mysectionName)
myRowIDs[i] = [];
let innerLoop = cityData[i].data; //内循环中的城市
myDataBlob[mysectionName] = zimu;//把字母放入总数据
// myLetters.push(zimu)//把字母放入用于右边的字母列表
for (let jj = 0; jj < innerLoop.length; jj++) {
let rowName = i + '_' + jj;
myRowIDs[i].push(rowName);
myDataBlob[rowName] = innerLoop[jj];
}
}
// console.log("打印setstate===================")
this.setState({
dataSource: this.state.dataSource.cloneWithRowsAndSections(myDataBlob, mySectionIDs, myRowIDs),
isLoading: false,
lettersShow: false
})
}
//返回箭头
handleBack = () => {
//把任务栈顶部的任务清除
this.props.navigation.goBack();
}
//左边的箭头
getNavLeftBtn = () => {
return <View style={{flexDirection: 'row', alignItems: 'center'}}>
<TouchableOpacity
activeOpacity={0.7}
onPress={this.handleBack}>
<Image source={require('../res/image/ic_arrow_back_white_36pt.png')}
style={{width: 24, height: 24}}/>
</TouchableOpacity>
</View>;
}
//页面渲染加载完调用加载数据
componentDidMount() {
this.loadData();
}
//设置行
renderRow(rowData, rowId) {
return (
<TouchableOpacity
key={rowId}
style={{height: ROWHEIGHT, justifyContent: 'center', paddingLeft: 20, paddingRight: 30}}
onPress={() => {
that.changedata(rowData)
}}>
<View style={styles.rowdata}><Text style={styles.rowdatatext}>{rowData}</Text></View>
</TouchableOpacity>
)
}
//设置组
renderSectionHeader = (sectionData, sectionID) => {
return (
<View style={{height: SECTIONHEIGHT, justifyContent: 'center', paddingLeft: 5, backgroundColor: 'gray'}}>
<Text style={{color: 'black', fontWeight: 'bold', marginLeft: 10}}>
{sectionData}
{/*{console.log(`sectionData = ${sectionData}`)}*/}
</Text>
</View>
)
}
// render ringht index Letters 右边的字母
// onLayout 测量字母
renderLetters(letter, index) {
return (
<TouchableOpacity
onLayout={({nativeEvent: e}) => this.oneLetterLayout(e)}
key={index} activeOpacity={0.7}
onPressIn={() => {
this.scrollTo(index)
}}>
<View
style={styles.letter}>
<Text style={styles.letterText}>{letter}</Text>
</View>
</TouchableOpacity>
)
}
//回调改变显示的城市
changedata = (cityname) => {
const {navigation} = this.props;
const {state, goBack} = navigation;
console.log(state);
console.log(cityname);
state.params.callback(cityname)
goBack();
}
//touch right indexLetters, scroll the left
scrollTo = (index) => {
let position = 0;
for (let i = 0; i < index; i++) {
position += totalheight[i]
}
this._listView.scrollTo({
y: position, animated: true
})
}
//搜索框高度
searchLayout = (e) => {
// console.log('searchLayout 高度' + e.layout.height);
}
//字母高度
lettersLayout = (e) => {
// console.log('lettersLayout 高度' + e.layout.height);
// console.log('lettersLayout y坐标' + e.layout.y);
lettersHeight = height - searchHeight * 2 - searchHeightMargin * 2;
// console.log('字母列表高度 = ' + lettersHeight);
// console.log('height = ' + height);
}
//每个字母高度
oneLetterLayout = (e) => {
// console.log('lettersLayout 高度' + e.layout.height);
// console.log('每个字母高度 y坐标' + e.layout.y);
// if (lettersItemheight.length >= 0) {
// lettersItemheight = [];
// }
if (lettersItemheight.length != myLetters.length) {
lettersItemheight.push(e.layout.y);
}
}
//文本改变
changeText = (text) => {
// console.log("改变的文本: " + text);
text = text.trim();
if (text != "") {
if (/^[\u4e00-\u9fa5]/.test(text)) {//是否有中文
console.log("===有中文===")
let mCityData = [];
console.log("原始数据: " + cityData);
let k = 0;
for (let i = 0; i < cityData.length; i++) {
let data = [];
data = cityData[i].data;
// console.log("data = " + data);
// console.log("data 长度 = " + data.length);
let isHas = false;//是否存在
var itemData = [];//这里是匹配的城市数据
for (let j = 0; j < data.length; j++) {
// console.log("字符串是否相等"+data[j].includes(text));
// console.log("输入框内: "+text);
// console.log("数据内: "+data[j]);
// itemData = cityData[i];
if (data[j].includes(text)) {
console.log("正确的itm data = " + cityData[i].data);
itemData.push(data[j]);
// mCityData.push(data);
isHas = true;//
}
}
//内层循环结束
console.log("itemData = " + itemData);
if (isHas) {
let obj;
obj = {'zimu': cityData[i].zimu, 'data': itemData, 'id': cityData[i].id};
console.log("添加的数据 " + obj.zimu + " " + obj.data);
console.log("添加的数据 " + obj);
mCityData[k] = obj;
k++;
}
}
// console.log("过滤后的数据: " + mCityData[0].data);
// console.log("过滤后的数据: " + mCityData[1].data);
// console.log("过滤后的数据长度: " + mCityData.length);
// console.log("过滤后的数据: "+mCityData );
// mCityData.map((item, i) => {
// console.log("\n" + item.data);
// })
this.updateData(mCityData);
} else {//否则是英文
for (let i = 0; i < cityData.length; i++) {
console.log("===英文===")
// console.log("打印字母 " + cityData[i].zimu);
// console.log("打印改变的文字 " + text.toLowerCase());
if (cityData[i].zimu == text.toUpperCase()) {
// if (cityData[i].zimu.indexOf(text) != -1) {
let mCityData = [];
mCityData.push(cityData[i]);
this.updateData(mCityData);
return;
}
}
}
} else {
// myDataBlob.map((item ,i)=>{
// console.log(item);
// })
// console.log(myDataBlob);
// console.log(mySectionIDs);
// console.log(myRowIDs);
//
// console.log("打印setstate===================")
console.log("===数据为空刷新===")
this.setState({
dataSource: this.state.dataSource.cloneWithRowsAndSections(myDataBlob, mySectionIDs, myRowIDs),
isLoading: false,
lettersShow: true
})
}
}
componentWillMount() {
this._panGesture = PanResponder.create({
//要求成为响应者：
onStartShouldSetPanResponder: (evt, gestureState) => true,
onStartShouldSetPanResponderCapture: (evt, gestureState) => true,
onMoveShouldSetPanResponder: (evt, gestureState) => true,
onMoveShouldSetPanResponderCapture: (evt, gestureState) => true,
onPanResponderTerminationRequest: (evt, gestureState) => true,
onPanResponderGrant: (evt, gestureState) => {
// console.log('触摸 当响应器产生时的屏幕坐标 \n x:' + gestureState.x0 + ',y:' + gestureState.y0);
let value = gestureState.y0 - searchHeight * 2 - lettersBottom + 1;
// console.log("点击的点 : " + value);
for (let i = 0; i < lettersItemheight.length; i++) {
if (value < 0) {
this.scrollTo(0);
} else if (value > lettersItemheight[i]) {
this.scrollTo(i);
}
}
},
onPanResponderMove: (evt, gestureState) => {
// console.log('移动 最近一次移动时的屏幕坐标\n moveX:' + gestureState.moveX + ',moveY:' + gestureState.moveY);
// console.log('移动 当响应器产生时的屏幕坐标\n x0:' + gestureState.x0 + ',y0:' + gestureState.y0);
// console.log('移动 从触摸操作开始时的累计纵向路程\n dx:' + gestureState.dx + ',dy :' + gestureState.dy);
let value = gestureState.moveY - searchHeight * 2 - lettersBottom + 1;
// console.log("移动的点 " + value);
for (let i = 0; i < lettersItemheight.length; i++) {
if (value < 0) {
this.scrollTo(0);
} else if (value > lettersItemheight[i]) {
this.scrollTo(i);
}
}
// console.log(this.mul(sub, myLetters.length));
},
onResponderTerminationRequest: (evt, gestureState) => true,
onPanResponderRelease: (evt, gestureState) => {
// console.log('抬手 x:' + gestureState.moveX + ',y:' + gestureState.moveY);
},
onPanResponderTerminate: (evt, gestureState) => {
// console.log(`结束 = evt.identifier = ${evt.identifier} gestureState = ${gestureState}`);
},
});
}
//做一些清除操作 避免再次进入会有数据异常
componentWillUnmount() {
myLetters = [];
myDataBlob = {};//获取到的数据
mySectionIDs = []; //组id
myRowIDs = [];//组内
cityData = [];//获取到的数据
lettersItemheight = [];
}
//渲染
render() {
return (
<View style={styles.container}>
<NavigationBar
onLayout={({nativeEvent: e1}) => this.navigationLayout(e1)}
ref={(ref) => this.myNavigationBar = ref}
title="选择城市"
leftButton={this.getNavLeftBtn()}
></NavigationBar>
<View
onLayout={({nativeEvent: e}) => this.searchLayout(e)}
style={styles.searchBox}>
<Image source={require('../res/image/search_bar_icon_normal.png')} style={styles.searchIcon}/>
<TextInput style={styles.inputText}
onChangeText={(text) => this.changeText(text)}
underlineColorAndroid='transparent' //设置下划线背景色透明 达到去掉下划线的效果
placeholder='请输入城市名称或首字母'/>
</View>
<ListView
contentContainerStyle={styles.contentContainer}
ref={listView => this._listView = listView}
dataSource={this.state.dataSource}
renderRow={this.renderRow}
renderSectionHeader={this.renderSectionHeader}
enableEmptySections={true}
initialListSize={totalNumber}
refreshControl={
<RefreshControl
refreshing={this.state.isLoading}
tintColor="#63B8FF"
title="正在加载..."
titleColor="#63B8FF"
colors={['#63B8FF']}
/>
}
/>
{
//判断是否显示右边字母列表
this.state.lettersShow == false ? (null) :
( <View
ref="ref_letters"
{...this._panGesture.panHandlers}
onLayout={({nativeEvent: e}) => this.lettersLayout(e)}
style={styles.letters}>
{myLetters.map((letter, index) => this.renderLetters(letter, index))}
</View>
)
}
</View>
);
}
};
const styles = StyleSheet.create({
container: {
flex: 1,
flexDirection: 'column'
},
contentContainer: {
width: width,
paddingBottom: 20,
backgroundColor: 'white',
},
//字母列表的样式
letters: {
flexDirection: 'column',
position: 'absolute',
height: height - searchHeight - searchHeight - lettersBottom - StatusBar.currentHeight,
top: searchHeight + searchHeight + 4,
bottom: lettersBottom,
right: 10,
backgroundColor: 'transparent',
justifyContent: 'space-between',
alignItems: 'center',
},
// height 字母的高度间距
// width 字母的宽度
letter: {
height: height * 3.3 / 100,
width: width * 3 / 50,
justifyContent: 'center',
alignItems: 'center',
},
letterText: {//右边list字母的样式
textAlign: 'center',
fontSize: height * 1.1 / 50,
color: 'black'
},
rowdata: {//下划线的样式
borderBottomColor: '#faf0e6',
borderBottomWidth: 0.5
},
rowdatatext: {
color: 'gray',
},
searchBox: {//最外层搜索框包裹
height: searchHeight,
borderColor: 'black',
flexDirection: 'row', // 水平排布
borderRadius: 10, // 设置圆角边
backgroundColor: '#FFF',
borderWidth: 0.8,
borderRadius: 10,
borderColor: 'gray',
alignItems: 'center',
marginLeft: 8,
paddingTop: 0,
marginTop: searchHeightMargin,
marginBottom: searchHeightMargin,
paddingBottom: 0,
marginRight: 8,
},
searchIcon: {//搜索图标
height: 20,
width: 20,
marginLeft: 5,
resizeMode: 'stretch'
},
inputText: {//搜索框
backgroundColor: 'transparent',
fontSize: 13,
paddingBottom: 0,
paddingTop: 0,
flex: 1,
},
})