react-native 完整實(shí)現(xiàn)登錄功能的示例代碼
react native實(shí)現(xiàn)登錄功能,包括ui的封裝、網(wǎng)絡(luò)請(qǐng)求的封裝、導(dǎo)航器的實(shí)現(xiàn)、點(diǎn)擊事件。
demo下載:react-native 完整實(shí)現(xiàn)登錄功能
后臺(tái)如果是springmvc實(shí)現(xiàn)的需要配置上如下代碼
<!--加入multipart 的解析器,這個(gè)必須配置,一會(huì)在controller里抓取上傳文件時(shí)要用。否則會(huì)報(bào)錯(cuò)。--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="102400"></property> <property name="defaultEncoding" value="utf-8"/><!--屬性:編碼--> </bean>
1.實(shí)現(xiàn)的界面
2.完整目錄
3.主界面的代碼實(shí)現(xiàn)
import React, { Component } from 'react'; import { ToolbarAndroid, AppRegistry, StyleSheet, Text, View, Image, TextInput, TouchableOpacity } from 'react-native'; import EditView from '../lib/EditView'; import LoginButton from '../lib/LoginButton'; import LoginSuccess from '../ui/LoginSuccess'; import NetUitl from '../lib/NetUtil'; export default class LoginActivity extends Component { constructor(props) { super(props); this.userName = ""; this.password = ""; } render() { return ( <View style={LoginStyles.loginview}> <View style={{flexDirection: 'row',height:100,marginTop:1, justifyContent: 'center', alignItems: 'flex-start',}}> <Image source={require('../image/login.png')}/> </View> <View style={{marginTop:80}}> <EditView name='輸入用戶名/注冊(cè)手機(jī)號(hào)' onChangeText={(text) => { this.userName = text; }}/> <EditView name='輸入密碼' onChangeText={(text) => { this.password = text; }}/> <LoginButton name='登錄' onPressCallback={this.onPressCallback}/> <Text style={{color:"#4A90E2",textAlign:'center',marginTop:10}} >忘記密碼?</Text> </View> </View> ) } onPressCallback = () => { let formData = new FormData(); formData.append("loginName",this.userName); formData.append("pwd",this.password); let url = "http://localhost:8080/loginApp"; NetUitl.postJson(url,formData,(responseText) => { alert(responseText); this.onLoginSuccess(); }) }; //跳轉(zhuǎn)到第二個(gè)頁(yè)面去 onLoginSuccess(){ const { navigator } = this.props; if (navigator) { navigator.push({ name : 'LoginSuccess', component : LoginSuccess, }); } } } class loginLineView extends Component { render() { return ( <Text > 沒有帳號(hào) </Text> ); } } const LoginStyles = StyleSheet.create({ loginview: { flex: 1, padding: 30, backgroundColor: '#ffffff', }, });
說明:
1.使用了線性布局,從上往下依次Image,EditView,LoginButton,Text
2.EditView和LoginButton 為自定義控件,實(shí)現(xiàn)輸入框,和按鈕的封裝。
4.EditView.js
import React, { Component } from 'react'; import { ToolbarAndroid, AppRegistry, StyleSheet, Text, View, Image, TextInput, TouchableOpacity } from 'react-native'; export default class EditView extends Component { constructor(props) { super(props); this.state = {text: ''}; } render() { return ( <View style={LoginStyles.TextInputView}> <TextInput style={LoginStyles.TextInput} placeholder={this.props.name} onChangeText={ (text) => { this.setState({text}); this.props.onChangeText(text); } } /> </View> ); } } const LoginStyles = StyleSheet.create({ TextInputView: { marginTop: 10, height:50, backgroundColor: '#ffffff', borderRadius:5, borderWidth:0.3, borderColor:'#000000', flexDirection: 'column', justifyContent: 'center', }, TextInput: { backgroundColor: '#ffffff', height:45, margin:18, }, });
說明:
1.利用TextInput的onChangeText 方法獲取到輸入框中輸入的數(shù)據(jù),在利用EditView 傳入的onChangeText回調(diào)方法,把數(shù)據(jù)回調(diào)出封裝的EditView,在外部獲取到TextInput輸入的數(shù)據(jù)。
5.LoginButton.js
import React, { Component } from 'react'; import { ToolbarAndroid, AppRegistry, StyleSheet, Text, View, Image, TextInput, TouchableOpacity } from 'react-native'; export default class LoginButton extends Component { constructor(props) { super(props); this.state = {text: ''}; } render() { return ( <TouchableOpacity onPress={this.props.onPressCallback} style={LoginStyles.loginTextView}> <Text style={LoginStyles.loginText} > {this.props.name} </Text> </TouchableOpacity> ); } } const LoginStyles = StyleSheet.create({ loginText: { color: '#ffffff', fontWeight: 'bold', width:30, }, loginTextView: { marginTop: 10, height:50, backgroundColor: '#3281DD', borderRadius:5, flexDirection: 'row', justifyContent: 'center', alignItems:'center', }, });
說明:
1.利用TouchableOpacity包住Text實(shí)現(xiàn)點(diǎn)擊效果,onPress是點(diǎn)擊時(shí)調(diào)用,當(dāng)點(diǎn)擊時(shí)onPress觸發(fā),調(diào)用外部傳入的onPressCallback 方法實(shí)現(xiàn)觸發(fā)事件在封裝的LoginButton外部定義觸發(fā)的效果。
6.NetUtil.js
let NetUtil = { postJson(url, data, callback){ var fetchOptions = { method: 'POST', headers: { 'Accept': 'application/json', 'Content-Type': 'multipart/form-data;boundary=6ff46e0b6b5148d984f148b6542e5a5d' }, body:data }; fetch(url, fetchOptions) .then((response) => response.text()) .then((responseText) => { // callback(JSON.parse(responseText)); callback(responseText); }).done(); }, } export default NetUtil;
說明:網(wǎng)絡(luò)方法,依次傳入請(qǐng)求地址,請(qǐng)求參數(shù),成功回調(diào)事件
7.LoginSuccess.js
import React from 'react'; import { View, Navigator, TouchableOpacity, ToolbarAndroid, Text } from 'react-native'; export default class LoginSuccess extends React.Component { constructor(props){ super(props); this.state = {}; } //回到第一個(gè)頁(yè)面去 onJump(){ const { navigator } = this.props; if (navigator) { navigator.pop(); } } render(){ return ( <View > <TouchableOpacity onPress = {this.onJump.bind(this)}> <Text> 登錄成功,點(diǎn)擊返回登錄頁(yè)面 </Text> </TouchableOpacity> </View> ); } }
說明:登錄成功后跳轉(zhuǎn)的界面
8.navigator.js
導(dǎo)航器控制類。利用name,component 實(shí)現(xiàn)導(dǎo)航(可以自己隨便定義命名,只要后面的類中訪問同樣的命名即可,課參考LoginSuccess.js 中的返回功能)
/** * Sample React Native App * https://github.com/facebook/react-native * @flow */ import React, { Component } from 'react'; import { AppRegistry, StyleSheet, Text, View, Navigator } from 'react-native'; import Main from './ui/main'; export default class navigator extends Component { constructor(props) { super(props); } render() { let defaultName = 'Main'; let defaultComponent = Main; return ( <Navigator initialRoute = {{name : defaultName , component: defaultComponent}} configureScene = {(route) => { return Navigator.SceneConfigs.VerticalDownSwipeJump; }} renderScene={(route,navigator) => { let Component = route.component; return <Component {...route.params} navigator = {navigator} /> }} /> ); } };
9.index.android.js
規(guī)定的類
/** * Sample React Native App * https://github.com/facebook/react-native * @flow */ import React, { Component } from 'react'; import { ToolbarAndroid, AppRegistry, StyleSheet, Text, View, Image, TextInput, TouchableOpacity } from 'react-native'; import Navigator from './app/navigator'; AppRegistry.registerComponent('AwesomeProject', () => Navigator);
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