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在原生APP開發中，相信很多開發者都會見到這種場景：點擊右上角更多的選項，彈出一個更多界面供用戶選擇。這種控件在原生開發中Android可以用PopupWindow實現，在iOS中可以用CMPopTipView,也可以自己寫一個View實現。其類似的效果如下圖所示：

實現思路分析：

要實現上面的視圖，有很多種實現方式。前面的文章說過，要實現彈框相關的可以用React Native 提供的 Modal組件(Modal組件)，使用Modal組件可以實現我們原生開發中的大多數效果。

要實現下拉三角，可以讓美工切一個帶下拉三角的背景，當然也可以自己通過ART實現（ART繪制）。對於選項卡的內容，在原生開發中為了適應更多的場景，我們一般會選擇使用ListView組件，然後當點擊某個Item的時候獲得相應的屬性即可。為了控制Modal的顯示與消失，我們可以給Modal內置一個isVisible: this.props.show狀態。

源碼

要實現上面的效果，會這涉及到三個js文件：MorePopWidows.js、Utils.js、HomeActionBar.js，按照先後順序，代碼如下：

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}>掃一掃</Text>
          </TouchableOpacity>
           <SpacingView/>
          <TouchableOpacity activeOpacity={1} onPress={() => Alert.alert('點擊了付款碼')} style={styles.itemView}>
           <Image style={styles.imgStyle} source={require('../images/ic_code_white.png')} />
           <Text style={styles.textStyle}>付款碼</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',
    justifyContent: 'center',
    alignItems: 'center',
    flex: 1,
  },
  textStyle: {
    color: '#fff',
    fontSize: 14,
    marginLeft: 2,
  },
  imgStyle: {
    width: 20,
    height: 20,
  }
});

最後是在代碼中使用MorePopWidows的代碼：

HomeActionBar.js

/**
 * https://github.com/facebook/react-native
 * @flow 首頁的標題欄
 */

import React, {Component} from 'react';
import {Platform, View, Dimensions, Text, StyleSheet, TouchableOpacity, 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}}>輸入商家、商品名稱</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}>掃碼</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,
    flexDirection: 'row',
    justifyContent: 'flex-start',
    alignItems: 'center',
    backgroundColor: 'white',
    alignSelf: 'center',
    paddingLeft: 10,
  },
  text: {
    fontSize: 16,
    color: '#ffffff',
    justifyContent: 'center',
  },
  iconStyle: {
    width: 22,
    height: 22,
  },
  action: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
  },
  scanIcon: {
    width: 28,
    height: 28,
    alignItems: 'center',
    marginLeft: 10,
  },
  scanText: {
    fontSize: 14,
    color: '#ffffff',
    justifyContent: 'center',
    alignItems: 'center',
  },
});

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持。