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在减速器中设置值时,Prop未按预期更新

redux react-native javascript

3

seulgibear · 技术社区 · 7 年前

组成部分:

class <ComponentName> extends Component {

    componentDidMount() {
        login()
    }
    
    render() {
        if(this.props.isLogged) 
            return (
                <App/>    
            );
        else 
            return (
                <ErrorScreen/>
            );
    }    
}



function mapStateToProps(state) {
    return {
      isLogged:state.auth.isLogged
    }
}


const mapDispatchToProps = (dispatch) => {
    return {
        login: () => dispatch(login())
    };
};

  
export default connect(mapStateToProps,mapDispatchToProps)(<ComponentName>)

行动:

export function login() {
    return {
        type:"TEST"
    }
}

减速器:

const initState = {
    isLogged: false,
    
}

export default (state=initState, action) => {
    switch(action.type) {
        case "TEST":
            return {
                ...state,
                isLogged: true
            }
            break;
    default:
        return state     
    }
}

联合收割机减速器:

import {combineReducers} from 'redux'
import AuthenticationReducer from './authenticationReducer'

export default combineReducers({
    auth: AuthenticationReducer
})

import React, {Component} from "react";
import <ComponentName> from './app/screens/<ComponentName>'
import store from './app/store'
import {Provider} from 'react-redux'

export default () =>
<Provider store={store}>
  <<ComponentName>/>
</Provider>;

1 回复 | 直到 5 年前

1

3

Dacre Denny 7 年前

代码不能按预期工作的原因是您正在调用 login() 行动创造者,而不是方法返回的 mapDispatchToProps() (然后注入 props <ComponentName/>

尝试通过添加 this.props 在你打电话给

class <ComponentName> extends Component {

    componentDidMount() {

        // Update this line here so that the login() method 
        // injected by connect() is called (ie via this.props)
        this.props.login()
    }

    render() {
        if(this.props.isLogged) 
            return <App/>
        else 
            return <ErrorScreen/>
    }    
}