元素类型无效：应为字符串（对于内置组件）或类/函数（对于复合组件）但得到：对象。反应原生

Question

所以我一直在做很多关于为什么这不起作用并且无法找到任何东西的研究。有谁知道这个错误与什么有关？

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.
    
    Check the render method of `App`.
    
    This error is located at:
        in App (created by ExpoRoot)
        in ExpoRoot
        in RCTView (created by View)
        in View (created by AppContainer)
        in RCTView (created by View)
        in View (created by AppContainer)
        in AppContainer
    - node_modules\expo\build\logs\LogSerialization.js:160:14 in _captureConsoleStackTrace
    - node_modules\expo\build\logs\LogSerialization.js:41:26 in serializeLogDataAsync
    - ... 9 more stack frames from framework internals

这是我的App.js：

import * as Icon from '@expo/vector-icons'
import * as AppLoading  from 'expo-app-loading'
import {Asset} from 'expo-asset'
import * as Font from 'expo-font'
import React from 'react'
import { StatusBar, StyleSheet, View } from 'react-native'
import AppNavigator from './navigation/AppNavigator'

export default class App extends React.Component {
  state = {
    isLoadingComplete: false,
  }

  render() {
    if (!this.state.isLoadingComplete && !this.props.skipLoadingScreen) {
      return (
        <AppLoading
          startAsync={this._loadResourcesAsync}
          onError={this._handleLoadingError}
          onFinish={this._handleFinishLoading}
        />
      )
    } else {
      return (
        <View style={styles.container}>
          <StatusBar hidden />
          <AppNavigator />
        </View>
      )
    }
  }

  _loadResourcesAsync = async () => {
    return Promise.all([
      Asset.loadAsync([
        require('./assets/images/splash.png'),
        require('./assets/images/icon.png'),
      ]),
      Font.loadAsync({
        //This is the font that we are using for our tab bar
        ...Icon.MaterialIcons.font,
        ...Icon.MaterialCommunityIcons.font,
        ...Icon.FontAwesome.font,
        ...Icon.Feather.font,
      }),
    ])
  }

  _handleLoadingError = error => {
    // In this case, you might want to report the error to your error
    // reporting service, for example Sentry
    console.warn(error)
  }

  _handleFinishLoading = () => {
    this.setState({ isLoadingComplete: true })
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
  },
})

我已经安装了所有必要的模块，重置了缓存，检查了导入语句，但似乎没有任何效果。

Answer 1

请遵循世博会文件：https : //docs.expo.io/versions/latest/sdk/app-loading。

代替

import * as AppLoading from 'expo-app-loading'

经过

import AppLoading from 'expo-app-loading'

解决您的问题。