image.png

import React from "react";
import {StyleSheet, Text, View} from 'react-native';
import type {ViewStyleProp} from "react-native/Libraries/StyleSheet/StyleSheet";

type Props = {
    viewStyles: ?ViewStyleProp,
    nowDate?: ?Date,
};

export default class SignInView extends React.Component<Props> {

    constructor(props) {
        super(props);

        this.state = {
            weeks: [],
            days: [],
        }

        this.lastDay = null
        this.nowDate = this.props.nowDate ? this.props.nowDate : new Date()

    }

    componentDidMount() {
        // 先获取最后一天
        const day = this.nowDate
        this.lastDay = new Date(day.getFullYear(), day.getMonth() + 1, 0)

        const w = this._getMonthWeek()
        const weekTemp = []

        for (let i = 1; i <= w; i++) {
            weekTemp.push(i)
        }

        this.setState({
            weeks: weekTemp
        })

        this._fetch()
    }

    // 获取当月有几周 周一开始
    _getMonthWeek = () => {
        const first = this._getFirstDay()
        // 获取第一周有几天
        const firstDays = 8 - first // 7 - f + 1
        return Math.ceil((this.lastDay.getDate() - firstDays) / 7) + 1
    }

    // 获取当月第一天是星期几  周一开始
    _getFirstDay = () => {
        const day = this.nowDate
        day.setDate(1)
        return day.getDay() === 0 ? 7 : day.getDay()
    }

    // 模拟请求数据
    _fetch = async () => {
        const signDay = []
        setTimeout(() => {
            signDay.push(1)
            signDay.push(5)
            signDay.push(6)
            signDay.push(7)
            signDay.push(10)

            this.setState({
                days: signDay
            })
        }, 2000);

    }

    render() {

        const first = this._getFirstDay() - 1
        const {viewStyles} = this.props

        return (
            <View style={[{padding: 10, backgroundColor: '#fff'}, viewStyles]}>
                <View style={styles.content}>
                    <Text style={styles.title}>一</Text>
                    <Text style={styles.title}>二</Text>
                    <Text style={styles.title}>三</Text>
                    <Text style={styles.title}>四</Text>
                    <Text style={styles.title}>五</Text>
                    <Text style={styles.title}>六</Text>
                    <Text style={styles.title}>日</Text>
                </View>
                {this.state.weeks.map((week) => (
                    <View style={styles.content}>
                        {this._getDayItem(7 * week - 6 - first)}
                        {this._getDayItem(7 * week - 5 - first)}
                        {this._getDayItem(7 * week - 4 - first)}
                        {this._getDayItem(7 * week - 3 - first)}
                        {this._getDayItem(7 * week - 2 - first)}
                        {this._getDayItem(7 * week - 1 - first)}
                        {this._getDayItem(7 * week - first)}
                    </View>
                ))}
            </View>
        )
    }

    _getDayItem(day) {
        const l = this.lastDay.getDate()
        if (this.state.days.indexOf(day) < 0) {
            return <Text style={styles.item}>{day > 0 && day <= l ? day : ''}</Text>
        }
        return (
            <View style={styles.itemChoosed}>
                <Text style={styles.textChoosed}>{day}</Text>
            </View>
        )
    }
}

const styles = StyleSheet.create({
    content: {
        flexDirection: 'row',
        paddingVertical: 10,
    },
    title: {
        flex: 1,
        textAlign: 'center',
        fontSize: 14,
        color: '#000',
    },
    item: {
        flex: 1,
        textAlign: 'center',
        fontSize: 12,
    },
    itemChoosed: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
    },
    textChoosed: {
        textAlign: 'center',
        marginTop: 2,
        fontSize: 11,
        backgroundColor: '#108AED',
        borderRadius: 9,
        width: 18,
        height: 18,
        color: '#fff',
    },
})

简单使用

import React, {Component} from 'react';
import {StyleSheet, Text, View} from 'react-native';
import SignInView from "./src";

type Props = {};
export default class App extends Component<Props> {
    render() {
        return (
            <View style={styles.container}>
                <Text style={styles.welcome}>Welcome to React Native!</Text>
                <SignInView viewStyles={{width: '90%', height: 'auto'}} nowDate={new Date(2018, 3, 8)}/>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: 'grey',
    },
    welcome: {
        fontSize: 20,
        textAlign: 'center',
        margin: 10,
    },
});