react native仿微信PopupWindow效果

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在原生APP开发中,相信很多开发者都会见到这种场景:点击右上角更多的选项,弹出一个更多界面供用户选择。这种控件在原生开发中Android可以用PopupWindow实现,在ios中可以用CMPopTipView,也可以自己写一个View实现。其类似的效果如下图所示:

实现思路分析
要实现上面的视图,有很多种实现方式。前面的文章说过,要实现弹框相关的可以用React Native 提供的 Modal组件(Modal组件),使用Modal组件可以实现我们原生开发中的大多数效果
要实现下拉三角,可以让美工切一个带下拉三角的背景,当然也可以自己通过ART实现(ART绘制)。对于选项卡的内容,在原生开发中为了适应更多的场景,我们一般会选择使用ListView组件,然后当点击某个Item的时候获得相应的属性即可。为了控制Modal的显示与消失,我们可以给Modal内置一个isVisible: this.props.show状态。

源码

要实现上面的效果,会这涉及到三个js文件:MorePopWidows.js、Utils.js、HomeActionBar.js,按照先后顺序,代码如下:
Utils.js

import {Dimensions} from 'react-native'

const deviceH = Dimensions.get('window').height
const deviceW = Dimensions.get('window').width

const basePx = 375

export default function px2dp(px) {
    return px *  deviceW / basePx
}

MorePopWidows.js

import React from 'react'
import {
    StyleSheet,Platform,View,Text,Image,TouchableOpacity,Alert,Modal,Dimensions,} from 'react-native'
import SpacingView from "./SpacingView";
import QRScanPage from "../home/QRScanPage";

const { width,height } = Dimensions.get('window');
import px2dp from '../util/Utils'

const mTop = px2dp(Platform.OS == "ios" ? 64 : 44)

let mwidth = 95;
let mheight = 100;
const marginTop = mTop;

export default class MorePopWidows extends React.Component {

    constructor(props) {
        super(props);
        this.state = {
            isVisible: this.props.show,}
        mwidth = this.props.width ;
        mheight = this.props.height ;
    }

    componentWillReceiveProps(nextProps) {
        this.setState({ isVisible: nextProps.show });
    }

    closeModal() {
        this.setState({
            isVisible: false
        });
        this.props.closeModal(false);
    }

    scan() {
        this.props.navigator.push({
            component: QRScanPage,})
    }

    render() {
        return (
            <View style={styles.container}>
              <Modal
                  transparent={true}
                  visible={this.state.isVisible}
                  animationType={'fade'}
                  onRequestClose={() => this.closeModal()}>
                <TouchableOpacity style={styles.container} activeOpacity={1} onPress={() => this.closeModal()}>

                  <View style={styles.modal}>
                    <TouchableOpacity activeOpacity={1} onPress={this.scan.bind(this)} style={styles.itemView}>
                      <Image style={styles.imgStyle} source={require('../images/ic_scan_code_white.png')} />
                      <Text style={styles.textStyle}>扫一扫</Text>
                    </TouchableOpacity>
                     <SpacingView/>
                    <TouchableOpacity activeOpacity={1} onPress={() => Alert.alert('点击了付款码')} style={styles.itemView}>
                      <Image style={styles.imgStyle} source={require('../images/ic_code_white.png')} />
                      <Text style={styles.textStyle}>付款码</Text>
                    </TouchableOpacity>
                  </View>
                </TouchableOpacity>
              </Modal>
            </View>
        )
    }
}
const styles = StyleSheet.create({
    container: {
        width: width,height: height,},modal: {
        backgroundColor: '#696969',width: mwidth,height: mheight,position: 'absolute',left: width - mwidth - 10,top: marginTop,padding: 5,justifyContent: 'center',alignItems: 'center',borderRadius: 3,itemView: {
        flexDirection: 'row',flex: 1,textStyle: {
        color: '#fff',fontSize: 14,marginLeft: 2,imgStyle: {
        width: 20,height: 20,}
});

最后是在代码中使用MorePopWidows的代码
HomeActionBar.js

/** * https://github.com/facebook/react-native * @flow 首页标题栏 */

import React,{Component} from 'react';
import {Platform,StyleSheet,Image} from 'react-native';
import SelectCityPage from '../home/SelectCityPage'
import MorePopWidows from '../component/MorePopWidows'
import px2dp from '../util/Utils'

const isIOS = Platform.OS == "ios"
const {width,height} = Dimensions.get('window')
const headH = px2dp(isIOS ? 64 : 44)

export default  class HomeActionBar extends Component {

    constructor(props) {
        super(props);
        this.state = {
            showPop: false,}
    }

    city() {
        this.props.navigator.push({
            component: SelectCityPage,})
    }

    renderHeader() {
        return (
            <View >
            <View style={styles.headerStyle}>
                <TouchableOpacity style={styles.action} onPress={this.city.bind(this)}>
                    <Text style={styles.text}>上海</Text>
                    <Image
                        source={require('../images/ic_arrow_down.png')}/>
                </TouchableOpacity>
                <TouchableOpacity style={styles.searchBar}>
                    <Image source={require('../images/ic_search.png')} style={styles.iconStyle}/>
                    <Text style={{fontSize: 13,color: "#666",marginLeft: 5}}>输入商家、商品名称</Text>
                </TouchableOpacity>
                <TouchableOpacity style={styles.action} onPress={() => { this.setState({ showPop: !this.state.showPop }) }}>
                    <Image style={styles.scanIcon}
                           source={require('../images/ic_scan_code_white.png')}/>
                    <Text style={styles.scanText}>扫码</Text>
                </TouchableOpacity>
            </View>
                <View style={{ position: 'absolute',top: headH,left: 0,width: width,height: height }}>
                    <MorePopWidows width={90} height={100} show={this.state.showPop} closeModal={(show) => {
                        this.setState({showPop: show})
                    }} {...this.props}/>
                </View>

            </View>
        )
    }

    render() {
        return (
            <View>
                {this.renderHeader()}
            </View>
        );
    }
}

const styles = StyleSheet.create({
    headerStyle: {
        backgroundColor: "#06C1AE",height: headH,paddingTop: px2dp(isIOS ? 20 : 0),paddingHorizontal: 16,flexDirection: 'row',alignItems: 'center',searchBar: {
        width: width * 0.65,height: 30,borderRadius: 19,marginLeft: 10,justifyContent: 'flex-start',backgroundColor: 'white',alignSelf: 'center',paddingLeft: 10,text: {
        fontSize: 16,color: '#ffffff',justifyContent: 'center',iconStyle: {
        width: 22,height: 22,action: {
        flexDirection: 'row',scanIcon: {
        width: 28,height: 28,scanText: {
        fontSize: 14,});
原文链接:https://www.f2er.com/react/302820.html

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