Javascript 如何在关闭和打开react本机应用程序后保持登录状态
我正在react native上开发一个具有登录选项的应用程序。我正在使用firebase身份验证。我设法从firebase捕获了当前用户uid。我的问题是我不能一直待在这里。每次我打开应用程序,它都会让我一次又一次地登录 这是我的密码: 我知道我应该使用异步,但我不知道怎么做Javascript 如何在关闭和打开react本机应用程序后保持登录状态,javascript,android,reactjs,react-native,firebase-authentication,Javascript,Android,Reactjs,React Native,Firebase Authentication,我正在react native上开发一个具有登录选项的应用程序。我正在使用firebase身份验证。我设法从firebase捕获了当前用户uid。我的问题是我不能一直待在这里。每次我打开应用程序,它都会让我一次又一次地登录 这是我的密码: 我知道我应该使用异步,但我不知道怎么做 import React from 'react'; import { StyleSheet, Text, View, TouchableOpacity, AsyncStorage, } from
import React from 'react';
import { StyleSheet,
Text,
View,
TouchableOpacity,
AsyncStorage,
} from 'react-native';
import {RkTextInput, RkButton } from 'react-native-ui-kitten';
import {Actions} from 'react-native-router-flux';
import { createSwitchNavigator, createAppContainer } from 'react-navigation';
import Profile from "../Profile/Profile";
import * as firebase from 'firebase';
export default class Login extends React.Component {
constructor(props){
super(props)
this.state=({
email:'savadks1919@gmail.com',
password:'123123',
userId:'',
errorMessage: null
})
}
signup() {
Actions.signup()
}
Home() {
Actions.home()
}
handleLogin = (email, password) => {
firebase.auth().signInWithEmailAndPassword(email, password).then(
this.Home,
this.state=({userId:firebase.auth().currentUser.uid})
).catch(function(error) {
var errorCode = error.code;
var errorMessage = error.message;
if (errorCode === 'auth/wrong-password') {
alert('Wrong password.');
} else {
alert(errorMessage);
}
console.log(error);
});
}
render() {
return (
<View style={styles.container}>
<Text style={styles.titleText}>Taams</Text>
<Text style={styles.edition}>Developer's Edition</Text>
<Text style={styles.titleText}>Login.js</Text>
<Text>Alpha 0.0.0.1</Text>
{/*-----UserName Input-------*/}
<RkTextInput
rkType= 'rounded'
labelStyle= {{color: 'black', fontWeight: 'bold'}}
placeholder='UserName'
//--------------value Handler----------------//
onChangeText={(email) => this.setState({email})}
//---------------------------------//
selectionColor="#000000"
keyboardType="email-address"
onSubmitEditing={() => { this.password.focusInput(); }}
inputStyle={{
color: 'black',
fontWeight: 'bold',
}}/>
{/*-----Password-------*/}
<RkTextInput
secureTextEntry={true}
rkType= 'rounded'
placeholder='Password'
//--------------value Handler----------------//
onChangeText={(password) => this.setState({password})}
//---------------------------------//
ref={(input) => { this.password = input; }}
inputStyle={{
color: 'black',
fontWeight: 'bold',
}}/>
<RkButton onPress = {()=>this.handleLogin(this.state.email,this.state.password)}>
<Text style={styles.LoginButtonText}>Login</Text>
</RkButton>
<View style={styles.signupTextCont}>
<Text style={styles.signupText}>Don't have an account yet?</Text>
<TouchableOpacity onPress={this.signup}><Text style={styles.signinButton}>SignUp</Text></TouchableOpacity>
</View>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
},
signupTextCont:{
flexGrow: 0,
alignItems:'center',
justifyContent:'flex-end',
marginVertical:15
},
signupText:{
color:'rgba(64,64,64,0.6)',
fontSize:16
},
signinButton:{
color:'#000000',
fontSize:16,
fontWeight:'500'
},
titleText: {
fontSize: 20,
fontWeight: 'bold',
},
edition: {
fontSize: 15,
},
TextInput: {
width: 300,
height:50,
borderColor: 'grey',
borderWidth: 1,
},
LoginButtonText: {
fontSize: 20,
fontWeight: 'bold',
color: 'white',
},
});
从“React”导入React;
导入{样式表,
文本,
看法
可触摸不透明度,
异步存储,
}从“反应本机”;
从“react native ui kitten”导入{RkTextInput,RkButton};
从“react native router flux”导入{Actions};
从“react navigation”导入{createSwitchNavigator,createAppContainer};
从“./Profile/Profile”导入配置文件;
从“firebase”导入*作为firebase;
导出默认类登录扩展React.Component{
建造师(道具){
超级(道具)
这个州=({
电邮:'savadks1919@gmail.com',
密码:'123123',
用户标识:“”,
错误消息:空
})
}
注册(){
行动。注册()
}
Home(){
行动.主页()
}
handleLogin=(电子邮件、密码)=>{
firebase.auth().使用email和password(电子邮件,密码)登录。然后(
这个家,,
this.state=({userId:firebase.auth().currentUser.uid})
).catch(函数(错误){
var errorCode=error.code;
var errorMessage=error.message;
如果(错误代码==='auth/错误密码'){
警报(“密码错误”);
}否则{
警报(错误消息);
}
console.log(错误);
});
}
render(){
返回(
塔姆斯
开发者版
Login.js
阿尔法0.0.0.1
{/*----用户名输入------*/}
this.setState({email})}
//---------------------------------//
selectionColor=“#000000”
keyboardType=“电子邮件地址”
onSubmitEditing={()=>{this.password.focusInput();}}
输入样式={{
颜色:'黑色',
fontWeight:'粗体',
}}/>
{/*----密码------*/}
this.setState({password})}
//---------------------------------//
ref={(输入)=>{this.password=input;}}
输入样式={{
颜色:'黑色',
fontWeight:'粗体',
}}/>
this.handleLogin(this.state.email,this.state.password)}>
登录
你还没有账户吗?
报名
);
}
}
const styles=StyleSheet.create({
容器:{
弹性:1,
背景颜色:“#fff”,
对齐项目:“居中”,
为内容辩护:“中心”,
},
signupTextCont:{
flexGrow:0,
对齐项目:'中心',
辩护内容:'flex-end',
利润率:15
},
登录文本:{
颜色:'rgba(64,64,64,0.6)',
字体大小:16
},
登录按钮:{
颜色:'#000000',
尺寸:16,
重量:'500'
},
标题文字:{
尺寸:20,
fontWeight:'粗体',
},
版本:{
尺寸:15,
},
文本输入:{
宽度:300,
身高:50,
边框颜色:“灰色”,
边框宽度:1,
},
登录按钮文本:{
尺寸:20,
fontWeight:'粗体',
颜色:'白色',
},
});
将从firebase登录请求获得的用户ID存储在异步存储中,如
Home(userId) {
(async ()=>{
await AsyncStorage.setItem("userId",userId)
Actions.home()
})()
}
redirectToHome() {
(async ()=>{
let userId = await AsyncStorage.getItem("userId",userId)
if(userId){
Actions.home()
}
else {
//redirect to login page
}
})()
}
AsyncStorage.clear()
然后下次打开应用程序时检查异步存储,如
Home(userId) {
(async ()=>{
await AsyncStorage.setItem("userId",userId)
Actions.home()
})()
}
redirectToHome() {
(async ()=>{
let userId = await AsyncStorage.getItem("userId",userId)
if(userId){
Actions.home()
}
else {
//redirect to login page
}
})()
}
AsyncStorage.clear()
注销时清除异步存储,如
Home(userId) {
(async ()=>{
await AsyncStorage.setItem("userId",userId)
Actions.home()
})()
}
redirectToHome() {
(async ()=>{
let userId = await AsyncStorage.getItem("userId",userId)
if(userId){
Actions.home()
}
else {
//redirect to login page
}
})()
}
AsyncStorage.clear()
在异步存储中存储从firebase登录请求获得的用户ID,如
Home(userId) {
(async ()=>{
await AsyncStorage.setItem("userId",userId)
Actions.home()
})()
}
redirectToHome() {
(async ()=>{
let userId = await AsyncStorage.getItem("userId",userId)
if(userId){
Actions.home()
}
else {
//redirect to login page
}
})()
}
AsyncStorage.clear()
然后下次打开应用程序时检查异步存储,如
Home(userId) {
(async ()=>{
await AsyncStorage.setItem("userId",userId)
Actions.home()
})()
}
redirectToHome() {
(async ()=>{
let userId = await AsyncStorage.getItem("userId",userId)
if(userId){
Actions.home()
}
else {
//redirect to login page
}
})()
}
AsyncStorage.clear()
注销时清除异步存储,如
Home(userId) {
(async ()=>{
await AsyncStorage.setItem("userId",userId)
Actions.home()
})()
}
redirectToHome() {
(async ()=>{
let userId = await AsyncStorage.getItem("userId",userId)
if(userId){
Actions.home()
}
else {
//redirect to login page
}
})()
}
AsyncStorage.clear()
此代码主要有助于保持应用程序处于登录状态 Login.js 首先导入异步存储并运行npm安装 1.npm添加@react本机社区/异步存储
import AsyncStorage from '@react-native-community/async-storage';
2.react-native链接@react-native社区/异步存储
import AsyncStorage from '@react-native-community/async-storage';
在您的登录功能中输入以下代码
setAsyncStorage(){ //set the value to async storage
try {
AsyncStorage.setItem('isLoggedIn', 'YES');
this.props.navigation.navigate("Home"); //(optional)
} catch (error) {
console.log(error);
}
};
现在将下面的代码放入componentDidMount()中以获取asyncStorage值
componentDidMount(){
SplashScreen.hide(); //(optional)
AsyncStorage.getItem('isLoggedIn').then((value) => {
if(value && value === 'YES') {
alert(value) //(Hide it once you get value from this)
this.props.navigation.navigate("Home")
} else {
}
})
}
要注销,请在主页中使用它
Home.js
import AsyncStorage from '@react-native-community/async-storage';
logout(){
this.props.navigation.navigate("Login")
AsyncStorage.clear()
}
此代码主要有助于保持应用程序处于登录状态 Login.js 首先导入异步存储并运行npm安装 1.npm添加@react本机社区/异步存储
import AsyncStorage from '@react-native-community/async-storage';
2.react-native链接@react-native社区/异步存储
import AsyncStorage from '@react-native-community/async-storage';
在您的登录功能中输入以下代码
setAsyncStorage(){ //set the value to async storage
try {
AsyncStorage.setItem('isLoggedIn', 'YES');
this.props.navigation.navigate("Home"); //(optional)
} catch (error) {
console.log(error);
}
};
现在将下面的代码放入componentDidMount()中以获取asyncStorage值
componentDidMount(){
SplashScreen.hide(); //(optional)
AsyncStorage.getItem('isLoggedIn').then((value) => {
if(value && value === 'YES') {
alert(value) //(Hide it once you get value from this)
this.props.navigation.navigate("Home")
} else {
}
})
}
要注销,请在主页中使用它
Home.js
import AsyncStorage from '@react-native-community/async-storage';
logout(){
this.props.navigation.navigate("Login")
AsyncStorage.clear()
}
谢谢你的重播。。。你能用我提供的代码演示一下吗。。因为我是新手,编程能力非常差\更新了我的解决方案,使用立即调用的功能执行异步功能感谢您的重播。。。你能用我提供的代码演示一下吗。。因为我是新手,编程能力非常差\更新了我的解决方案,使用立即调用的功能来执行异步函数