react-native 完整实现登录功能的示例代码

reactnative实现登录功能，包括ui的封装、网络请求的封装、导航器的实现、点击事件。demo下

react native实现登录功能，包括ui的封装、网络请求的封装、导航器的实现、点击事件。

demo下载：react-native 完整实现登录功能

后台如果是springmvc实现的需要配置上如下代码

 <!--加入multipart 的解析器,这个必须配置，一会在controller里抓取上传文件时要用。否则会报错。-->
 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

 <property name="maxUploadSize" value="102400"></property>

 <property name="defaultEncoding" value="utf-8"/><!--属性：编码-->

 </bean>

1.实现的界面

2.完整目录

3.主界面的代码实现

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='输入用户名/注册手机号' onChangeText={(text) => {
 this.userName = text;
 }}/>
 <EditView name='输入密码' onChangeText={(text) => {
 this.password = text;
 }}/>
 <LoginButton name='登录' onPressCallback={this.onPressCallback}/>
 <Text style={{color:"#4A90E2",textAlign:'center',marginTop:10}} >忘记密码？</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();
 })


 };

 //跳转到第二个页面去
 onLoginSuccess(){
 const { navigator } = this.props;
 if (navigator) {
 navigator.push({
 name : 'LoginSuccess',
 component : LoginSuccess,
 });
 }
 }

}

class loginLineView extends Component {
 render() {
 return (
 <Text >
 没有帐号
 </Text>
 );
 }
}

const LoginStyles = StyleSheet.create({
 loginview: {
 flex: 1,
 padding: 30,
 backgroundColor: '#ffffff',
 },
});

说明：

1.使用了线性布局，从上往下依次Image，EditView，LoginButton，Text

2.EditView和LoginButton 为自定义控件，实现输入框，和按钮的封装。

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,
 },
});

说明：

1.利用TextInput的onChangeText 方法获取到输入框中输入的数据，在利用EditView 传入的onChangeText回调方法，把数据回调出封装的EditView，在外部获取到TextInput输入的数据。

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',
 },
});

说明：

1.利用TouchableOpacity包住Text实现点击效果，onPress是点击时调用，当点击时onPress触发，调用外部传入的onPressCallback 方法实现触发事件在封装的LoginButton外部定义触发的效果。

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;

说明：网络方法，依次传入请求地址，请求参数，成功回调事件

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 = {};

 }
 //回到第一个页面去
 onJump(){
 const { navigator } = this.props;
 if (navigator) {
 navigator.pop();
 }
 }

 render(){
 return (

 <View >
 <TouchableOpacity onPress = {this.onJump.bind(this)}>
 <Text> 登录成功，点击返回登录页面 </Text>
 </TouchableOpacity>
 </View>


 );

 }

}

说明：登录成功后跳转的界面

8.navigator.js

导航器控制类。利用name，component 实现导航（可以自己随便定义命名，只要后面的类中访问同样的命名即可，课参考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

规定的类

/**
 * 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);

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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