React native React Native Birth picker-组件将接收道具

我需要为react naive应用程序构建一个生日选择器。我发现了以下内容，但其中包含已弃用的方法componentWillREceiveProps

我还没有那么丰富的经验，所以我不知道如何用新的方法来改变它。有人能帮忙吗

//
// DatePicker with an optional year.
//
// code from https://github.com/ericmorgan1/react-native-birthdaypicker/blob/master/BirthdayPicker.js


import React from 'react';
import { StyleSheet, View, Picker, } from 'react-native';

export default class BirthdayPicker extends React.Component {
static defaultProps= {
selectedYear:   (new Date()).getFullYear(),     // Year to initialize the picker to (set to 0 to not have a year)
selectedMonth:  (new Date()).getMonth(),        // Month to initialize the picker to
selectedDay:    (new Date()).getDate(),         // Day to initailize the picker to
yearsBack:      100,                            // How many years backwards (from starting year) you want to show

onYearValueChange: function(year, idx) { },     // Function called when year changes
onMonthValueChange: function(month, idx) { },   // Function called when month changes
onDayValueChange: function(day, idx) { },       // Function called when day changes
}

constructor(props) {
super(props);

this.startingYear = this.props.selectedYear;
this.state = {
  year:     this.props.selectedYear,
  month:    this.props.selectedMonth, 
  day:      this.props.selectedDay,
}
}

componentWillReceiveProps(nextProps) {
this.setState({
  year: nextProps.selectedYear, month: nextProps.selectedMonth, day: nextProps.selectedDay
});
}

// Tries to get the browser locale...
getLocale() {
if (navigator.language) { return navigator.language; }
if (navigator.languages && navigator.languages.length > 0) { return navigator.languages[0]; }
return "en-us"; // Default to English
}

// Loops through the months and gets the long name string...
 getMonthNames() {
 var locale = this.getLocale();

var monthNames = [];
for (var i = 0; i < 12; i++) {
  var date = new Date(2000, i, 15);
  monthNames.push(date.toLocaleString(locale, { month: "long" }));
}
return monthNames;
}

// Returns the number of days in the given month...
getNumDaysInMonth(year, month) {
// February is the only month that can change, so if there's no year, assume it has the maximum (29) days...
return (year == 0 && month == 1) ? 29 : (new Date(year, month + 1, 0).getDate());
}

// Returns the <Picker.Item> values for the years...
renderYearPickerItems() {
// If year was 0, change it to current...
var currentYear = (new Date()).getFullYear();
var centerYear = this.startingYear;
if (centerYear === 0) { centerYear = currentYear; }

// Set starting and ending years...
var startYear = centerYear - this.props.yearsBack;
var endYear = currentYear;

var years = [];
for (var i = startYear; i <= endYear; i++) {
  years.push(<Picker.Item label={i.toString()} value={i} key={i} />);
}
years.push(<Picker.Item label="----" value={0} key={0} />);
return years;
}

// Returns the <Picker.Item> values for the months...
renderMonthPickerItems() {
var months = this.getMonthNames();
return months.map(function(month, index) {
  return <Picker.Item label={month} value={index} key={index} />;
});
}

// Returns the <Picker.Item> values for the days (based on current month/year)...
renderDayPickerItems() {
// February is the only day that can change, so if there's no year, assume it has the maximum (29) days...
var numDays = this.getNumDaysInMonth(this.state.year, this.state.month);

var days = [];
for (var i = 1; i <= numDays; i++) {
    days.push(<Picker.Item label={i.toString()} value={i} key={i} />);
}
return days;
}

// Occurs when year value changes...
onYearChange = (value, index) => {
// Check if days are valid...
var maxDays = this.getNumDaysInMonth(value, this.state.month);
var day = (this.state.day > maxDays) ? maxDays : this.state.day;

this.setState({ year: value, day: day });
this.props.onYearValueChange(value, index);
}

// Occurs when month value changes...
onMonthChange = (value, index) => {
// Check if days are valid...
var maxDays = this.getNumDaysInMonth(this.state.year, value);
var day = (this.state.day > maxDays) ? maxDays : this.state.day;

this.setState({ month: value, day: day });
this.props.onMonthValueChange(value, index);
}

// Occurs when day value changes...
onDayChange = (value, index) => {
this.setState({ day: value });
this.props.onDayValueChange(value, index);
}

render() {
return (
  <View style={styles.container}>
    <Picker style={styles.monthPicker} selectedValue={this.state.month} onValueChange={this.onMonthChange}>
      {this.renderMonthPickerItems()}
    </Picker>

    <Picker style={styles.dayPicker} selectedValue={this.state.day} onValueChange={this.onDayChange}>
      {this.renderDayPickerItems()}
    </Picker>

    <Picker style={styles.yearPicker} selectedValue={this.state.year} onValueChange={this.onYearChange}>
      {this.renderYearPickerItems()}
    </Picker>
  </View>
  );
  }
 }

const styles = StyleSheet.create({
container:    { flexDirection: "row", },
monthPicker:  { flex: 3, },
dayPicker:    { flex: 1, },
yearPicker:   { flex: 2, },
});

//
//具有可选年份的日期选择器。
//
//代码来自https://github.com/ericmorgan1/react-native-birthdaypicker/blob/master/BirthdayPicker.js
从“React”导入React；
从“react native”导入{StyleSheet，View，Picker，}；
导出默认类BirthdayPicker扩展React.Component{
静态defaultProps={
selectedYear:（new Date（））.getFullYear（），//要将选择器初始化为的年份（设置为0表示没有年份）
selectedMonth:（new Date（））.getMonth（），//初始化选择器的月份
selectedDay:（new Date（））.getDate（），//初始化选择器的日期
yearsBack:100，//您希望显示向后倒退了多少年（从起始年算起）
onYearValueChange:function（year，idx）{}，//在年份更改时调用的函数
onMonthValueChange:function（month，idx）{}，//在月份更改时调用的函数
onDayValueChange:function（day，idx）{}，//在日期更改时调用的函数
}
建造师（道具）{
超级（道具）；
this.startingYear=this.props.selectedYear；
此.state={
年份：this.props.selectedYear，
月份：this.props.selectedMonth，
day:this.props.selectedDay，
}
}
组件将接收道具（下一步）{
这是我的国家({
年份：nextProps.selectedYear，月份：nextProps.selectedMonth，day:nextProps.selectedDay
});
}
//尝试获取浏览器区域设置。。。
getLocale（）{
if（navigator.language）{return navigator.language；}
如果（navigator.languages&&navigator.languages.length>0）{return navigator.languages[0]；}
返回“en us”；//默认为英语
}
//循环遍历月份并获取长名称字符串。。。
getMonthNames（）{
var locale=this.getLocale（）；
var monthNames=[]；
对于（变量i=0；i<12；i++）{
var日期=新的日期（2000年1月15日）；
monthNames.push（date.tolocalesting（locale，{month:“long”}））；
}
返回月份；
}
//返回给定月份的天数。。。
getNumDaysInMonth（年，月）{
//二月是唯一可以改变的月份，所以如果没有年份，假设它有最多（29）天。。。
return（year==0&&month==1）？29：（新日期（year，month+1,0）.getDate（））；
}
//返回年份的值。。。
renderYearPickerItems（）{
//如果年份为0，则将其更改为当前。。。
变量currentYear=（新日期（））.getFullYear（）；
var centerYear=此。开始年份；
如果（centerYear==0）{centerYear=currentYear；}
//设置开始和结束年份。。。
var startYear=centerYear-this.props.yearsBack；
var endYear=当前年份；
风险值年数=[]；
对于（var i=startYear；i