reactjs - 如何从其他组件更新状态？

我正在使用 native react 和 react 导航进行路由。

如何从另一个组件/页面更新状态？

主屏幕

export class HomeScreen extends Component {
  constructor(){
    this.state = {
      test: ''
    }
  }

  updateState = ()=>{
    this.setState({test:'new value'});
  }

 }



SideMenuScreen
import { HomeScreen } from "./home";

export class SideMenuScreen extends Component {

  updateHomeState = ()=>{
    let oHome = new HomeScreen();
    oHome.updateState();
  }

}

我的App.js以及路由和sidemenu配置如下:

import { createAppContainer, createDrawerNavigator } from "react-navigation";
import { SideMenuScreen } from "./screens/Sidemenu";
import { HomeScreen } from "./screens/Home";

export default class App extends Component {
  render() {
    return(
      <AppContainer></AppContainer>
    );
  }
}

const AppNavigator = createDrawerNavigator(
  {Home: HomeScreen,
    other: otherpage},
  {
    contentComponent: SideMenuScreen
  }
);

const AppContainer = createAppContainer(AppNavigator);

updateState正在执行，但不更新状态。

最佳答案

由于您的组件之间没有父子关系，因此可以通过 Redux Action 完成此操作

HomeScreen;

export class HomeScreen extends Component {
  constructor() {
    this.state = {
      test: ""
    };
  }

  componentWillReceiveProps(nextProps) {
    const { test: nextTest } = nextProps;
    const { test } = this.props;

    if (nextTest !== test) {
        this.setState({ test: nextTest });
    }
  }

}

const mapStateToProps = ({ yourReducerName: test }) => ({ test });
export connect(mapStateToProps)(HomeScreen);

import { HomeScreen } from "./home";
import { connect } from "tls";

class SideMenuScreen extends Component {
  updateHomeState = () => {
    const { updateHomeStateAction } = this.props;

    updateHomeStateAction({ test: 'New Value' });
  };
}

export default connect(null, { updateHomeStateAction })(SideMenuScreen);

关于reactjs - 如何从其他组件更新状态？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/55572323/