不变违规：对象作为使用 Expo 的 React 子项无效

Question

我正在尝试在我的 React Native 应用程序（使用 Expo）中使用 React 的新上下文 api。但是我得到一个错误。请注意，仅当我尝试将 Context.Provider 抽象为组件时才会出现此错误。
这是我的 UserContext.js 代码：

import React from "react";
import { SecureStore } from 'expo';
import { AUTH_TOKEN, FIRST_NAME, LAST_NAME, EMAIL } from '../constants/config'

// Signed-in user context
const UserContext = React.createContext();

export class UserContextProvider extends React.Component {

constructor(props) {
    super(props)
    this.state = {
    token: SecureStore.getItemAsync(AUTH_TOKEN) || "",
    firstName: SecureStore.getItemAsync(FIRST_NAME) || "",
    lastName: SecureStore.getItemAsync(LAST_NAME) || "",
    email: SecureStore.getItemAsync(EMAIL) || "",
    };
    this.setUserContext = this.setUserContext.bind(this);
}

setUserContext = (authToken, firstName, lastName, email) => {
    SecureStore.setItem(AUTH_TOKEN, authToken);
    SecureStore.setItem(FIRST_NAME, firstName);
    SecureStore.setItem(LAST_NAME, lastName);
    SecureStore.setItem(EMAIL, email);
    this.setState({
    authToken, firstName, lastName, email
    });
};

render() {
    const {children} = this.props;

    return (
    <UserContext.Provider
        value={{
        ...this.state,
        setUserContext: this.setUserContext,
        }}
    >
        // TODO: Render UserContext presentation component here

        <React.Fragment>
        {children}
        </React.Fragment>
    </UserContext.Provider>
    );
}
}

export const UserContextConsumer = UserContext.Consumer;

这是我的 App.js 代码的一部分，我在其中使用了 UserContextProvider。请注意这是我的应用程序的根目录：

import { UserContextProvider } from "./contexts/UserContext";

export default () => {
return (
    <ApolloProvider client={client}>
    <UserContextProvider componentChildren={Root}>
        <Root/>
    </UserContextProvider>
    </ApolloProvider>
);
}

我按以下方式在我的屏幕（或组件）中使用 UserContextConsumer。请注意，当我导航到以下代码所在的屏幕时会抛出错误：

import { UserContextConsumer } from '../contexts/UserContext';

.
.
.
<Text style={styles.textLink}>
    <UserContextConsumer>
    {context => {
        return context.token
    }}
    </UserContextConsumer>
</Text>

我收到以下错误：

Invariant Violation: Objects are not valid as a React child (found: object with keys {_40, _65, _55, _72}). If you meant to render a collection of children, use an array instead.
in RCTText (at Text.js:202)
in Text (at LoginScreen.js:26)
in RCTView (at View.js:60)
in View (at createAnimatedComponent.js:154)
in AnimatedComponent (at TouchableOpacity.js:247)
in TouchableOpacity (at LoginScreen.js:24)
in RCTView (at View.js:60)
in View (at Form.js:10)
in Form (at connectStyle.js:384)
in Styled(Form) (at LoginScreen.js:18)
in RCTView (at View.js:60)
in View (at LoginScreen.js:17)
in RCTScrollContentView (at ScrollView.js:791)
in RCTScrollView (at ScrollView.js:887)
in ScrollView (at KeyboardAwareHOC.js:397)
in _class (at Content.js:125)
in Content (at connectStyle.js:384)
in Styled(Content) (at LoginScreen.js:15)
in RCTView (at View.js:60)
in View (at Container.js:15)
in Container (at connectStyle.js:384)
in Styled(Container) (at LoginScreen.js:14)
in LoginScreen (at SceneView.js:9)
in SceneView (at StackViewLayout.js:483)
in RCTView (at View.js:60)
in View (at createAnimatedComponent.js:154)
in AnimatedComponent (at screens.native.js:51)
in Screen (at StackViewCard.js:42)
in Card (at createPointerEventsContainer.js:26)
in Container (at StackViewLayout.js:507)
in RCTView (at View.js:60)
in View (at screens.native.js:76)
in ScreenContainer (at StackViewLayout.js:401)
in RCTView (at View.js:60)
in View (at StackViewLayout.js:400)
in StackViewLayout (at withOrientation.js:30)
in withOrientation (at StackView.js:49)
in RCTView (at View.js:60)
in View (at Transitioner.js:141)
in Transitioner (at StackView.js:19)
in StackView (at createNavigator.js:59)
in Navigator (at createKeyboardAwareNavigator.js:11)
in KeyboardAwareNavigator (at createNavigationContainer.js:376)
in NavigationContainer (at SceneView.js:9)
in SceneView (at SwitchView.js:12)
in SwitchView (at createNavigator.js:59)
in Navigator (at createNavigationContainer.js:376)
in NavigationContainer (at Root.js:24)
in RCTView (at View.js:60)
in View (at Root.js:22)
in Root (at App.js:58)
in UserContextProvider (at App.js:57)
in ApolloProvider (at App.js:56)
in Unknown (at registerRootComponent.js:35)
in RootErrorBoundary (at registerRootComponent.js:34)
in ExpoRootComponent (at renderApplication.js:33)
in RCTView (at View.js:60)
in View (at AppContainer.js:102)
in RCTView (at View.js:60)
in View (at AppContainer.js:122)
in AppContainer (at renderApplication.js:32)

This error is located at:
in RCTText (at Text.js:202)
in Text (at LoginScreen.js:26)
in RCTView (at View.js:60)
in View (at createAnimatedComponent.js:154)
in AnimatedComponent (at TouchableOpacity.js:247)
in TouchableOpacity (at LoginScreen.js:24)
in RCTView (at View.js:60)
in View (at Form.js:10)
in Form (at connectStyle.js:384)
in Styled(Form) (at LoginScreen.js:18)
in RCTView (at View.js:60)
in View (at LoginScreen.js:17)
in RCTScrollContentView (at ScrollView.js:791)
in RCTScrollView (at ScrollView.js:887)
in ScrollView (at KeyboardAwareHOC.js:397)
in _class (at Content.js:125)
in Content (at connectStyle.js:384)
in Styled(Content) (at LoginScreen.js:15)
in RCTView (at View.js:60)
in View (at Container.js:15)
in Container (at connectStyle.js:384)
in Styled(Container) (at LoginScreen.js:14)
in LoginScreen (at SceneView.js:9)
in SceneView (at StackViewLayout.js:483)
in RCTView (at View.js:60)
in View (at createAnimatedComponent.js:154)
in AnimatedComponent (at screens.native.js:51)
in Screen (at StackViewCard.js:42)
in Card (at createPointerEventsContainer.js:26)
in Container (at StackViewLayout.js:507)
in RCTView (at View.js:60)
in View (at screens.native.js:76)
in ScreenContainer (at StackViewLayout.js:401)
in RCTView (at View.js:60)
in View (at StackViewLayout.js:400)
in StackViewLayout (at withOrientation.js:30)
in withOrientation (at StackView.js:49)
in RCTView (at View.js:60)
in View (at Transitioner.js:141)
in Transitioner (at StackView.js:19)
in StackView (at createNavigator.js:59)
in Navigator (at createKeyboardAwareNavigator.js:11)
in KeyboardAwareNavigator (at createNavigationContainer.js:376)
in NavigationContainer (at SceneView.js:9)
in SceneView (at SwitchView.js:12)
in SwitchView (at createNavigator.js:59)
in Navigator (at createNavigationContainer.js:376)
in NavigationContainer (at Root.js:24)
in RCTView (at View.js:60)
in View (at Root.js:22)
in Root (at App.js:58)
in UserContextProvider (at App.js:57)
in ApolloProvider (at App.js:56)
in Unknown (at registerRootComponent.js:35)
in RootErrorBoundary (at registerRootComponent.js:34)
in ExpoRootComponent (at renderApplication.js:33)
in RCTView (at View.js:60)
in View (at AppContainer.js:102)
in RCTView (at View.js:60)
in View (at AppContainer.js:122)
in AppContainer (at renderApplication.js:32)

throwOnInvalidObjectType
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:9955:20
reconcileChildFibers
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:10650:37
reconcileChildrenAtExpirationTime
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:10749:52
reconcileChildren
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:10744:44
updateContextConsumer
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:11295:28
performUnitOfWork
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:14020:31
workLoop
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:14044:49
renderRoot
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:14070:23
performWorkOnRoot
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:14561:40
performWork
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:14493:32
performSyncWork
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:14473:22
batchedUpdates
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:14643:30
batchedUpdates
AppEntry.bundle?platform=ios&dev=true&minify=false&hot=false&assetPlugin=%2FUsers%2FPasha%2Freact-native-projects%2Fexpo%2Fyumm%2Fnode_modules%2Fexpo%2Ftools%2FhashAssetFiles:6775:33
_receiveRootNodeIDEvent
AppEntry.bundle?platform=ios&dev=true&minify=fal

如果您需要更多信息，请告诉我。非常感谢您的帮助。

谢谢你。

Answer 1

好吧，我不明白为什么我第一眼看不到这个，但你正试图直接渲染一个对象：token。这里：

<UserContextConsumer>
    {context => {
        return context.token
    }}
</UserContextConsumer>

那么，你想渲染它的属性吗？

<UserContextConsumer>
    {context => {
        return context.token._40
    }}
</UserContextConsumer>

或者你当然可以用其他方式使用，但是不能直接渲染。

不变违规：对象作为使用 Expo 的 React 子项无效

Invariant Violation: Objects are not valid as a React child using Expo

reactjs

react-native

expo

react-context