在很多App中都会涉及到分享，React Native提供了Modal组件用来实现一些模态弹窗，例如加载进度框，分享弹框等。使用Modal搭建分析的效果如下：

自定义的分析界面代码如下：

ShareAlertDialog.js

/** * https://github.com/facebook/react-native * @flow 分享弹窗 */import React, {Component} from 'react';import {View, TouchableOpacity, Alert,StyleSheet, Dimensions, Modal, Text, Image} from 'react-native';import Separator from "./Separator";const {width, height} = Dimensions.get('window');const dialogH = 110;export default class ShareAlertDialog extends Component { constructor(props) { super(props); this.state = { isVisible: this.props.show, }; } componentWillReceiveProps(nextProps) { this.setState({isVisible: nextProps.show}); } closeModal() { this.setState({ isVisible: false }); this.props.closeModal(false); } renderDialog() { return ( <View style={styles.modalStyle}> <Text style={styles.text}>选择分享方式</Text> <Separator/> <View style={{flex: 1, flexDirection: 'row', marginTop: 15}}> <TouchableOpacity style={styles.item} onPress={() => Alert.alert('分享到微信朋友圈')}> <Image resizeMode='contain' style={styles.image} source={require('../images/share_ic_friends.png')}/> <Text>微信朋友圈</Text> </TouchableOpacity> <TouchableOpacity style={styles.item}> <Image resizeMode='contain' style={styles.image} source={require('../images/share_ic_weixin.png')}/> <Text>微信好友</Text> </TouchableOpacity> <TouchableOpacity style={styles.item}> <Image resizeMode='contain' style={styles.image} source={require('../images/share_ic_weibo.png')}/> <Text>新浪微博</Text> </TouchableOpacity> </View> </View> ) } render() { return ( <View style={{flex: 1}}> <Modal transparent={true} visible={this.state.isVisible} animationType={'fade'} onRequestClose={() => this.closeModal()}> <TouchableOpacity style={styles.container} activeOpacity={1} onPress={() => this.closeModal()}> {this.renderDialog()} </TouchableOpacity> </Modal> </View> ); }}const styles = StyleSheet.create({ container: { flex: 1, backgroundColor: 'rgba(0, 0, 0, 0.5)', }, modalStyle: { position: "absolute", top: height - 170, left: 0, width: width, height: dialogH, backgroundColor: '#ffffff' }, subView: { width: width, height: dialogH, backgroundColor: '#ffffff' }, text: { flex: 1, fontSize: 18, margin: 10, justifyContent: 'center', alignItems: 'center', alignSelf: 'center' }, item: { width: width / 3, height: 100, alignItems: 'center', backgroundColor: '#ffffff' }, image: { width: 60, height: 60, marginBottom: 8 },});

当点击某个按钮之后，就会弹出框，示例代码如下：

constructor(props) { super(props); this.state = { showSharePop: false,//分享弹窗，默认不显示 } }//省略onSharePress() { this.setState({showSharePop: !this.state.showSharePop}) }//增加点击<NavigationBar navigator={this.props.navigator} popEnabled={false} style={{backgroundColor: "transparent", position: "absolute", top: 0, width}} leftButton={ViewUtils.getLeftButton(() => this.props.navigator.pop())} rightButton={ViewUtils.getShareButton(() => this.onSharePress())}/>//添加ShareAlertDialog自定义组件<ShareAlertDialog show={this.state.showSharePop} closeModal={(show) => { this.setState({showSharePop: show}) }} {...this.props}/>

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