Reactjs react导航使用react上下文包装根AppContainer
我正在寻找使用react导航在我的react本机应用程序中管理全局状态的方法。我试图实现基本的React上下文,我想围绕React导航的Reactjs react导航使用react上下文包装根AppContainer,reactjs,react-native,react-navigation,Reactjs,React Native,React Navigation,我正在寻找使用react导航在我的react本机应用程序中管理全局状态的方法。我试图实现基本的React上下文,我想围绕React导航的createAppContainer()方法来实现它,但它不起作用 最后,我使用上下文的HOC从index.js文件包装了一个应用程序容器,但当上下文的状态更改时,react导航似乎在重新呈现嵌套组件方面存在问题。我可以从嵌套组件访问上下文,但当上下文状态更改时,它们不会被呈现 我的index.js文件如下所示: import { AppRegistry } f
createAppContainer()
方法来实现它,但它不起作用
最后,我使用上下文的HOC从index.js
文件包装了一个应用程序容器,但当上下文的状态更改时,react导航似乎在重新呈现嵌套组件方面存在问题。我可以从嵌套组件访问上下文,但当上下文状态更改时,它们不会被呈现
我的index.js
文件如下所示:
import { AppRegistry } from "react-native";
import App from "./src/App";
import { withAppContextProvider } from "./src/AppContext";
import { name as appName } from "./app.json";
AppRegistry.registerComponent(appName, () => withAppContextProvider(App));
// for new react static context API
export const AppContext = createContext({});
// create the consumer as higher order component
export const withAppContext = ChildComponent => props => (
<AppContext.Consumer>
{context => <ChildComponent {...props} global={context} />}
</AppContext.Consumer>
);
// create the Provider as higher order component (only for root Component of the application)
export const withAppContextProvider = ChildComponent => props => (
<AppContextProvider>
<ChildComponent {...props} />
</AppContextProvider>
);
export class AppContextProvider extends Component {
state = {
isOnline: true
};
handleConnectivityChange = isOnline => {
this.setState({ isOnline });
};
componentDidMount = async () => {
NetInfo.isConnected.addEventListener(
"connectionChange",
this.handleConnectivityChange
);
};
componentWillUnmount() {
NetInfo.isConnected.removeEventListener(
"connectionChange",
this.handleConnectivityChange
);
}
render() {
return (
<AppContext.Provider
value={{
...this.state
}}
>
{this.props.children}
</AppContext.Provider>
);
}
}
const HomeStack = createStackNavigator(
{
Home: HomeScreen,
Cities: CitiesScreen
},
getStackConfig({ initialRouteName: "Home" })
);
const SettingsStack = createStackNavigator(
{
Settings: SettingsScreen
},
getStackConfig({ initialRouteName: "Settings" })
);
export default createAppContainer(
createBottomTabNavigator(
{
Home: HomeStack,
Settings: SettingsStack
}
)
);
我的上下文类如下所示:
import { AppRegistry } from "react-native";
import App from "./src/App";
import { withAppContextProvider } from "./src/AppContext";
import { name as appName } from "./app.json";
AppRegistry.registerComponent(appName, () => withAppContextProvider(App));
// for new react static context API
export const AppContext = createContext({});
// create the consumer as higher order component
export const withAppContext = ChildComponent => props => (
<AppContext.Consumer>
{context => <ChildComponent {...props} global={context} />}
</AppContext.Consumer>
);
// create the Provider as higher order component (only for root Component of the application)
export const withAppContextProvider = ChildComponent => props => (
<AppContextProvider>
<ChildComponent {...props} />
</AppContextProvider>
);
export class AppContextProvider extends Component {
state = {
isOnline: true
};
handleConnectivityChange = isOnline => {
this.setState({ isOnline });
};
componentDidMount = async () => {
NetInfo.isConnected.addEventListener(
"connectionChange",
this.handleConnectivityChange
);
};
componentWillUnmount() {
NetInfo.isConnected.removeEventListener(
"connectionChange",
this.handleConnectivityChange
);
}
render() {
return (
<AppContext.Provider
value={{
...this.state
}}
>
{this.props.children}
</AppContext.Provider>
);
}
}
const HomeStack = createStackNavigator(
{
Home: HomeScreen,
Cities: CitiesScreen
},
getStackConfig({ initialRouteName: "Home" })
);
const SettingsStack = createStackNavigator(
{
Settings: SettingsScreen
},
getStackConfig({ initialRouteName: "Settings" })
);
export default createAppContainer(
createBottomTabNavigator(
{
Home: HomeStack,
Settings: SettingsStack
}
)
);
CitiesScreen
组件示例:
import { AppContext } from "../AppContext";
class CitiesScreen extends Component {
static contextType = AppContext;
render() {
return (
<View style={styles.container}>
<Text>This value should change on isOnline update: {this.context.isOnline}</Text>
</View>
);
}
}
从“./AppContext”导入{AppContext};
类CitiesScreen扩展组件{
静态contextType=AppContext;
render(){
返回(
此值应在isOnline更新时更改:{This.context.isOnline}
);
}
}
现在,当我从例如
CitiesScreen
组件访问上下文时,我当前能够获得isOnline
上下文状态的值,但每当我打开/关闭internet连接(在android emulator上)时,上下文状态会发生更改,但组件不会重新呈现,并且我的应该组件更新()
方法未被触发。有什么帮助吗?在我的例子中,我将React从16.8降级到16.5.0,React导航版本是3。
我仍在调查,但这只是暂时的解决办法。没有人帮忙吗?