javascript - 如何解决 Invariant violation :Text strings must be rendered within a component in React Native?

Question

在我的 React-Native 项目中，我安装了以下版本的 react-navigation:

npm install react-navigation@^1.0.0-beta.11

然后运行命令:

npm 安装

在所有这些安装之后，我创建了一个名为 WelcomeScreen.js 的类，下面是为此给出的代码-

WelcomeScreen.js

import React, { Component } from "react";
import {
    View,
    StyleSheet,
    Button
} from "react-native";

class WelcomeScreen extends Component {

    static navigationOptions = {
        header: 'none'
    }

    render() {
        return (
            <View style={styles.container}>
                <Button title="Log in" onPress={() => this.props.navigation.navigate('LoginScreen')}/>
                <Button title="Sign Up" onPress={() => this.props.navigation.navigate('SignUpScreen')}/>
            </View>
        )
    }
}
export default WelcomeScreen;

const styles = StyleSheet.create({
    container: {
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center'
    }
});

之后，我在我的 App.js 文件中路由了这个类。这是下面给出的代码:

App.js

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';

import { StackNavigator } from 'react-navigation'
import WelcomeScreen from './screens/WelcomeScreen'
export default class App extends React.Component {
  render() {
    return (
      <AppStackNavigator/>
    );
  }
}

const AppStackNavigator = new StackNavigator({
  WelcomeScreen: { screen: WelcomeScreen }
})


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

然后在运行我的项目后，我不断收到此错误:

不变性违规:文本字符串必须在组件内呈现

Invarient violation:Text strings must be rendered within a component

我不明白为什么会出现此错误？我尝试了以下解决方案-

Invariant Violation: Text strings must be rendered within a <Text> component

https://github.com/facebook/react-native/issues/20084

它们都对我没有帮助。所以，如果有人能帮我解决这个问题，那就太好了。

Answer 1

你在标题中使用了错误的值

static navigationOptions = {
    header: "none"        
};

将"none"替换为null

static navigationOptions = {
        header: null        
};