Question

问题

我正在创建一个简单的应用程序，人们可以使用 react native 和 firebase 来创建帖子，当我添加所有代码来上传变量时＃34; postInput＆＃34;到服务器，我收到错误（包含图片）说该应用程序尚未创建，它告诉我调用App.initializeApp()但我确实在我的代码中应用程序。我很乐意帮助解决这个问题。

代码

import React, { Component } from 'react';
import { StyleSheet, Text, View, Image, TextInput, ScrollView, TouchableHighlight, Button } from 'react-native';
import { Font } from 'expo';
import * as firebase from 'firebase';

var fontLoaded = false;

var ref = firebase.database().ref('posts');

var newPostRef = ref.child("posts");

var newPostRef = postsRef.push();

const firebaseConfig = {
  apiKey: "AIzaSyD025SWUH7zLELn4vWtf9nGq1-0h33Y958",
  authDomain: "candidtwo.firebaseapp.com",
  databaseURL: "https://candidtwo.firebaseio.com",
  storageBucket: "candidtwo.appspot.com",
};
const firebaseApp = App.initializeApp(firebaseConfig); //tells me to call this, I do and still get error

export default class App extends React.Component {

  state = {
    fontLoaded: false,
  };



  componentDidMount() {
      Expo.Font.loadAsync({
        'JosefinSans-Regular.ttf': require('./JosefinSans-Regular.ttf'),
      });
 }
  constructor(props) {
    super(props);
    this.state = { postInput: ""}
  }

 render() {
    return (
      <View style={styles.container}>
        <View style={styles.button}>
          <View style={{width: 1, height: 30, backgroundColor: '#e8e8e8'}} />
          <Button
            onPress={() => this.setState({ fontLoaded: true })}
            title="Press Me To Load the App After 15 Seconds!"
            color="#fe8200"
            accessibilityLabel="Wait 15 seconds and then press me to load the font!"
          />
        </View>


        {this.state.fontLoaded ? (
          <View style={styles.container}>
            <Text style={{ fontFamily: 'JosefinSans-Regular', fontSize: 16 }}>
                Whats on your mind? Create a post!
            </Text>  

            <TextInput
                 style={{height:40, width: 320, borderColor: '#303030', borderWidth: 1}}
                 onChangeText={(postInput)=>this.setState({postInput})}
                 value={this.state.postInput}    
             />


    <Button
      onPress={() => {
        newPostRef.set({ content:this.state.postInput });
        this.setState({ postInput: "Your post was succsesfully uploaded! :)" })    
      }}               
      title="                              +                              "
      color="#fe8200"
    />

var path = newPostRef.toString();

            <ScrollView>
               <View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />
               <View style={{width: 350, height: 250, backgroundColor: '#1daff1',  alignItems: 'center', justifyContent: 'center',    borderRadius: 10, paddingLeft: 10, paddingRight:10}} >
         <Text style={{ fontFamily: 'JosefinSans-Regular', fontSize: 18, color: '#ffffff', textAlign: 'center'}}>
                    Why do android phones have higher inital quality than apple phones, but apple phones have a more consistent amount of quality throughout their years?
                </Text>
            </View>
               <View style={{width: 350, height: 40, borderRadius: 10, backgroundColor: '#147aa8', flexDirection: 'row',paddingLeft:5}} >
            <Image source={require('./CandidtwoImages/unlove.png')} />
            <Text style={{ fontFamily: 'JosefinSans-Regular', fontSize: 18, color: '#ffffff'}}>
                    3
                    </Text>
            <Image source={require('./CandidtwoImages/undislike.png')} />
            <Text style={{ fontFamily: 'JosefinSans-Regular', fontSize: 18, color: '#ffffff'}}>
                    1
                    </Text>
            <Image source={require('./CandidtwoImages/comments.png')} />
            <Text style={{ fontFamily: 'JosefinSans-Regular', fontSize: 18, color: '#ffffff'}}>
                    8
                    </Text>
        </View>
               <View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />
               <View style={{width: 35, height: 25, backgroundColor: '#147c41', borderRadius: 10}} />
               <View style={{width: 35, height: 4, backgroundColor: '#0f582d', borderRadius: 10}} />
               <View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />
           <View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />
               <View style={{width: 35, height: 25, backgroundColor: '#9dcd46', borderRadius: 10}} />
               <View style={{width: 35, height: 4, backgroundColor: '#6c8f31', borderRadius: 10}} />
               <View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />
           <View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />
               <View style={{width: 35, height: 25, backgroundColor: '#d3832e', borderRadius: 10}} />
               <View style={{width: 35, height: 4, backgroundColor: '#935b1e', borderRadius: 10}} />
               <View style={{width: 1, height: 6, backgroundColor: '#e8e8e8'}} />

             </ScrollView>
          </View>) : (null) }
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 8,
    backgroundColor: '#e8e8e8',
    alignItems: 'center'
  },
  button: {
    flex: 1,
    backgroundColor: '#e8e8e8',
    alignItems: 'center'
  },
});

错误消息

Answer 1

您应该调用它来初始化您的应用。

def surrounding(ninjas, x, y):
   noNinjas = 0
   for r in range(y - 1 if y > 0 else y, y + 2 if y < len(ninjas) else y + 1):
      for c in range(x - 1 if x > 0 else x, x + 2 if x < len(ninjas) else x + 1):
         if ninjas[r][c] == 'N':
            noNinjas += 1
   return noNinjas

Answer 2

所以，在这一行：

var ref = firebase.database().ref('posts');

当您的firebase应用程序尚未初始化时，您正尝试为firebase数据库分配引用。

下面：

const firebaseApp = App.initializeApp(firebaseConfig);

您正在尝试初始化从App类调用initializeApp（）方法的firebase应用程序，并且此方法属于您上面所做的firebase导入，并且您不需要初始化firebase应用程序将其分配给变量。

你可以做的是这样的事情：

删除您要创建变量ref;

的行

像这样初始化你的firebase应用程序：

firebase.initializeApp(config);

然后您可以创建变量ref;

var ref = firebase.database().ref('posts');

React Native / Firebase错误应用尚未创建

2 个答案: