不變違規：元素類型無效：React Native

Question

我4-5天前開始學習react native，現在我在React Native中建立登錄屏幕。 但是面對這個問題，我試圖解決這個問題，但不幸的是，我不能這樣做。 大家能幫我嗎？ 我將在此處附加我的代碼和屏幕截圖。 錯誤截圖

App.js
import React, { Component} from 'react';
import { StyleSheet, Text, View } from 'react-native';
import Login from './src/screens/Login';


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

這是登錄屏幕代碼

Login.js


  import React, { Component} from 'react';
import { StyleSheet, TextInput, View, Image, StatusBar, Dimensions } from 'react-native';
import { LinearGradient } from 'expo';
import EStyleSheet from 'react-native-extended-stylesheet';
import { Button }  from '../components/Button';
import { Ionicons } from '@expo/vector-icons';

const {width: WIDTH} = Dimensions.get('window')

EStyleSheet.build();

export default class Login extends Component {
  render() {
    return (
      <LinearGradient
      colors={['#38E870', '#2BB256']} 
      style={styles.container}>
      <StatusBar barStyle="light-content" />
      <View style={styles.logocontainer}>
        <Image source={require('../images/Devastic.png/')} />
      </View>
      <View style={styles.formContainer}>
      <View style={styles.inputcontainer}>
      <Ionicons name="ios-person-outline" size={36} color="#747475" 
      style={styles.inputemail}/>
           <TextInput 
           placeholder={'Enter Your Email'}
           underlineColorAndroid={'transparent'}
           placeholderTextColor="#dfe6e9"
           style={styles.input}
           />
           <Ionicons name="ios-unlock-outline" size={34} color="#747475" 
      style={styles.inputpass}/>
           <TextInput 
           placeholder={'Enter Your Password'}
           secureTextEntry={true}
           underlineColorAndroid={'transparent'}
           placeholderTextColor="#dfe6e9"
           style={styles.input}
           />     
           <Button
           text="Log In"
           onPress={() => console.log ("Pressed")}
            />
            </View>
      </View>
      </LinearGradient>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    },
    logocontainer: {
        paddingTop: 50,
    },
    formContainer: {
      backgroundColor: '#FFF',
      marginTop: 180,
      width: 360,
      height: 340,
      borderRadius: 10,
      shadowColor: '#000',
      shadowOffset: { width: 0, height: 2 },
      shadowOpacity: 0.6,
      shadowRadius: 6,
      elevation: 8,
      },
      inputcontainer: {
        marginTop: 30,
      },
      inputemail: {
               position: 'absolute',
               left: 18,
               top: 13,
      },
      inputpass: {
        position: 'absolute',
               left: 18,
               top: 77,
      },

      input: {
      width: WIDTH -50 ,
      height: 44,
      padding: 10,
      paddingLeft: 40,
      marginVertical: 10,
      marginHorizontal: 10,
      borderWidth: 1,
      borderRadius: 20,
      borderColor: 'black',
      marginBottom: 10,
      }
});

這是Button.js文件代碼

import React from 'react';
    import { View, TouchableHighlight, TouchableNativeFeedback, Text, Platform } from 'react-native';
    import EStyleSheet from 'react-native-extended-stylesheet';

    const styles = EStyleSheet.create({
      $buttonColor: '#38E870',
      $buttonTextColor: '#ffffff',
      $buttonUnderlayColor: '#2BB256',
      button: {
        backgroundColor: '$buttonColor',
        paddingVertical: 10,
        paddingHorizontal: 30,
        marginHorizontal: 12,
        borderRadius: 40,
        marginTop: 20,
        },
      text: {
        color: '$buttonTextColor',
        fontSize: 18,
        textAlign: 'center',
        fontWeight: 'bold',
      },
    });

    export const Button = ({ text, onPress }) => {
      if (Platform.OS === 'ios') {
        return (
          <TouchableHighlight
            onPress={onPress}
            style={styles.button}
            underlayColor={styles.$buttonUnderlayColor}
          >
            <Text style={styles.text}>{text}</Text>
          </TouchableHighlight>
        );
      }

      return (

        <TouchableNativeFeedback
          onPress={onPress}
          background={TouchableNativeFeedback.Ripple(styles.$buttonUnderlayColor)}
        >
          <View style={styles.button}>
            <Text style={styles.text}>{text}</Text>
          </View>
        </TouchableNativeFeedback>
      );
    };

Answer 1

我認為這是因為您導出Button組件的方式。

export foo;
import {foo} from 'blah';


export default foo;
import foo from 'blah';

解決您的問題

取代這個

export const Button = ({ text, onPress }) => 

有了這個

export default const Button = ({ text, onPress }) => 

有關更多詳細信息，請檢查此更多詳細信息

Answer 2

在Login.js文件中，您正在將Button導入為對象。

更改如下：

從

import { Button }  from '../components/Button';

至

import Button from '../components/Button';

有關更多信息，請看： 未捕獲的錯誤：不變的違規：元素類型無效：預期為字符串（用於內置組件）或類/函數，但得到了：對象

希望這會有所幫助！