react native仿微信PopupWindow效果的实例代码
程序员文章站
2022-05-14 19:25:36
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...
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', justifycontent: 'center', alignitems: 'center', 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 首页的标题栏 */ 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}}>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, 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', }, });
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