[英]Using react + hooks, how can i call/use "navigate()" after a async redux dispatch properly?
[英]React Native Redux how can I update UI, navigate to new screen after call API that without used flag
我正在使用react-native和redux,thunk开发一个移动应用程序,这是我第一次用react-native编写。
我的问题是我调用了一个api,响应是有效的,我想做一些事情作为更新UI,导航到新屏幕...为此,我需要在组件中使用标记来对其进行标记。
这是登录示例,用户登录成功后,我想导航到主屏幕。 为此,我需要在componentWillReceiveProps
方法的isLoginSuccess
中检查道具中的isLoginSuccess
标志,以了解用户是否已成功登录,但是我认为这不是一个好的解决方案。
我的问题是,我们还有其他不用使用标志的方法。
action.js
export const LOGIN_SUCCESS = "LOGIN_SUCCESS";
export const LOGIN_FAIL = "LOGIN_FAIL";
export const LOGIN = "LOGIN";
export function login(username, password) {
console.log(username)
return {
type: LOGIN,
username: username,
password: password
}
}
export function loginSuccess(data) {
return {
type: LOGIN_SUCCESS,
loginData: data
}
}
export function loginFail(error) {
return {
type: LOGIN_FAIL,
error: error
}
}
export function doLogin(username, password) {
return (dispatch) => {
dispatch(login(username, password))
api.login(username, password)
.then(response => response.json())
.then(jsonData => {
console.log(jsonData)
dispatch(loginSuccess(jsonData))
})
.catch((error) => {
dispatch(loginFail(error))
})
}
}
reducer.js
const initialState = {
loginData:{},
isLoginDoing : false,
isLoginSuccess : false,
username :"",
password : "",
error : {},
}
export default function(state = initialState , action ={}){
switch(action.type){
case actionType.LOGIN:{
return {
...state,
username: action.username,
password: action.password,
isLoginDoing : true
}
}
case actionType.LOGIN_SUCCESS:{
return {
...state,
loginData: action.loginData,
isLoginDoing : false,
isLoginSuccess : true
}
}
case actionType.LOGIN_FAIL:{
return {
...state,
isLoginDoing : false,
isLoginSuccess : false,
error : action.error
}
}
default :{
return state
}
}
}
component.js
import { connect } from "react-redux"
import { bindActionCreators } from 'redux';
import { doLogin } from '../actions'
import BaseComponent from './baseComponent'
class Login extends BaseComponent {
constructor(props) {
super(props)
this.state = {
username: '',
password: '',
}
this.functionLogin = this.functionLogin.bind(this);
}
functionLogin() {
const { username, password } = this.state;
if(!this.props.loginReducer.isLoginDoing){
this.props.doLogin(username, password)
}
}
componentWillReceiveProps (nextProps) {
console.log("componentWillReceiveProps");
const { navigate, goBack } = this.props.navigation;
if(nextProps.loginReducer.isLoginSuccess){
// this._navigateTo('Home')
navigate('Home',nextProps.loginReducer.loginData);
}
}
render() {
const { navigate, goBack } = this.props.navigation;
return (
<View style={{ backgroundColor: 'color', marginTop: 10 }} >
<TextInput
style={{ height: 40 }}
placeholder="Username"
onChangeText={value => this.setState({ username: value })}
/>
<TextInput
style={{ height: 40 }}
placeholder="Password"
onChangeText={value => this.setState({ password: value })}
/>
<Button
onPress={this.functionLogin}
title="Login"
color="#841584"
/>
</View>
);
}
}
const mapStateToProps = (state) => {
console.log(state);
return {
loginReducer: state.loginReducer
};
}
function mapDispatchToProps(dispatch) {
return {
doLogin: (username, password) => dispatch(doLogin(username, password))
}
}
export default connect(mapStateToProps, mapDispatchToProps)(Login)
谢谢
在函数doLogin中,可以在dispatch(loginSuccess(jsonData))
之后dispatch(loginSuccess(jsonData))
导航动作。
例如,react-navigation(如果您已将其与redux集成在一起,如果不是这样,请参见https://reactnavigation.org/docs/guides/redux ):
dispatch(NavigationActions.navigate({routeName: 'Home'});
(不要忘记import { NavigationActions } from 'react-navigation';
)
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