无法使反应导航工作：`元素类型无效`

Question

我无法获得反应导航工作的示例。我总是以错误Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object. You likely forgot to export your component from the file it's defined in.

结束

这是使用intro page

中的示例

import React from 'react';
import {
  AppRegistry,
  Text,
} from 'react-native';
import { StackNavigator } from 'react-navigation';

class HomeScreen extends React.Component {
  static navigationOptions = {
    title: 'Welcome',
  };
  render() {
    return <Text>Hello, Navigation!</Text>;
  }
}

const SimpleApp = StackNavigator({
  Home: { screen: HomeScreen },
});

AppRegistry.registerComponent('SimpleApp', () => SimpleApp);

我正在为iOS构建并在设备上运行（而不是模拟器）。

Answer 1

我认为您错过了导出HomeScreen类：

class HomeScreen extends React.Component {

用

替换它

export default class HomeScreen extends React.Component {