我正在按照这个文档从反应导航来学习,我正在尝试和尝试,但我无法在屏幕之间导航。每次我更改某些内容时,都会弹出一个随机错误。如果我只调用一个屏幕作为 App.js 根目录内的<HomeScreen/>
,则应用程序.js运行良好。
我像这样调用主屏幕:
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import HomeScreen from './Comps/HomeScreen';
import { StackNavigator } from 'react-navigation';
import DetailsScreen from './Comps/DetailsScreen';
class App extends React.Component {
render() {
return (
<HomeScreen />
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff',
alignItems: 'center',
justifyContent: 'center',
},
});
export default App;
现在这工作正常,显示了HomeScreen.js
里面的东西
import React from 'react';
import { StyleSheet, Text, View, SafeAreaView, Button } from 'react-native';
import { createDrawerNavigator } from 'react-navigation-drawer';
import { createAppContainer, navigation } from 'react-navigation';
import { createStackNavigator } from 'react-navigation-stack';
class HomeScreen extends React.Component {
render() {
return (
<View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
<Text>Home Screen</Text>
<Button
title="Go to Details"
onPress={() => this.props.navigation.navigate('Details')}
/>
</View>
);
}
}
export default HomeScreen;
但是当我单击按钮时会弹出一个随机错误,有时它说未定义不是对象,有时找不到StackNavigator
,有时导航有问题。我安装了所有依赖项,但仍然请告诉我我是否在这里缺少某些内容。
从HomeScreen.js
我打电话给DetailsScreen.js
就像文档中所说的那样。
import React from 'react';
import { StyleSheet, Text, View, SafeAreaView, Button } from 'react-native';
import { createDrawerNavigator } from 'react-navigation-drawer';
import { createAppContainer, navigation } from 'react-navigation';
import { createStackNavigator } from 'react-navigation-stack';
import { withNavigation } from 'react-navigation';
class DetailsScreen extends React.Component {
render() {
return (
<View style={{ flex: 1, alignItems: 'center', justifyContent: 'center' }}>
<Text>Details Screen</Text>
<Button
title="Go to Details... again"
onPress={() => this.props.navigation.navigate('Details')}
/>
</View>
);
}
}
export default DetailsScreen;
你需要像这样使用 createAppContainer 定义一个 AppContainer(什么是 AppContainers(
const AppContainer = createAppContainer(RootStack);
那里的RootStack将是您要显示的屏幕列表。 像这样使用 createStackNavigator(什么是 createStackNavigator(添加它们,如下所示:
const RootStack = createStackNavigator(
{
Home: HomeScreen,
Details: DetailsScreen,
},
{
initialRouteName: 'Home',
}
);
并在 App 中添加const AppContainer
和const RootStack
.js然后导出class App
如下所示:
export default class App extends React.Component {
render() {
return <AppContainer/>;
}
如果屏幕位于不同的文件中,请说./Comps/HomeScreen.js
或./Comps/DetailsScreen.js
然后在创建屏幕之前将它们导入应用程序中.js像这样:
import HomeScreen from './Comps/HomeScreen';
import DetailsScreen from './Comps/DetailsScreen'