react-navigation的超级大坑
Posted wuvkcyan
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本文针对react-navigation^3.0.0版本,版本不对的话,请不要看本文,直接看官方英文文档
? 最近一直在学习RN,没找到什么好的视频,所以一直看文档,一路上来虽然遇到一些乱七八糟的bug,但是能比较友好的解决掉
直到我使用react-navigation
,这个官方文档上说简单易用
的导航组件,搞的我心态爆照,调试了一下午
首先我按网上的例子来
import {StackNavigator} from ‘react-navigation‘;
const HomeScreen = () => (
<View style={{flex: 1, justifyContent: ‘center‘, alignItems: ‘center‘}}>
<Text>Home Screen</Text>
</View>
);
const DetailScreen = () => (
<View style={{flex: 1, justifyContent: ‘center‘, alignItems: ‘center‘}}>
<Text>Detail Screen</Text>
</View>
);
const RootNavigator = StackNavigator({
Home: {
screen: HomeScreen
},
Detail: {
screen: DetailScreen
}
});
export default RootNavigator;
上来就是报错
undefined is not a function (evaluating‘_reactNavigation.StackNavigator....‘)
我一看,这说我导入的不是函数????
查看道路部分,发现新的文档,方法名字都变了???
import {
createStackNavigator,
} from ‘react-navigation‘;
const App = createStackNavigator({
Home: { screen: HomeScreen },
Profile: { screen: ProfileScreen },
});
export default App;
重启
依旧报错
React Native - undefined is not an object(evaluating ‘RNGestureHandlerModule.state‘)
在这里google查了半天,都没有看到解决方案
因为一直这看中文文档,狗中文文档根本就不是3.0.0版本,最后直接去看英文文档!!
文档上有一句
Next, install react-native-gesture-handler. If you’re using Expo you don’t need to do anything here, it’s included in the SDK. Otherwise:
接下来,安装react-native-gesture-handler。 如果你正在使用Expo,你不需要在这里做任何事情,它包含在SDK中。 除此以外
// 我完全不知道Expo指什么,但是我还是跑了他下面的命令
yarn add react-native-gesture-handler
react-native link
我们看看官方的demo
import React from "react";
import { View, Text } from "react-native";
import { createStackNavigator, createAppContainer } from "react-navigation";
class HomeScreen extends React.Component {
render() {
return (
<View style={{ flex: 1, alignItems: "center", justifyContent: "center" }}>
<Text>Home Screen</Text>
</View>
);
}
}
const AppNavigator = createStackNavigator({
Home: {
screen: HomeScreen
}
});
export default createAppContainer(AppNavigator);
这demo怎么和我看过的都不一样???
于是我改动了写的代码
App.js
import React, { Component } from ‘react‘
import { Platform, StyleSheet, Text, View } from ‘react-native‘
import { createStackNavigator, createAppContainer } from ‘react-navigation‘
import HomeScreen from ‘./pages/HomeScreen‘
import ProfileScreen from ‘./pages/ProfileScreen‘
const navigator = createStackNavigator({
Home: { screen: HomeScreen },
Profile: { screen: ProfileScreen }
})
const App = createAppContainer(navigator)
export default App
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: ‘center‘,
alignItems: ‘center‘,
backgroundColor: ‘#F5FCFF‘
},
welcome: {
fontSize: 20,
textAlign: ‘center‘,
margin: 10
},
instructions: {
textAlign: ‘center‘,
color: ‘#333333‘,
marginBottom: 5
}
})
pages/ProfileScreen
import React, { Component } from ‘react‘
import { Text, StyleSheet, View } from ‘react-native‘
export default class ProfileScreen extends Component {
static navigationOptions = {
title: ‘ProfileScreen‘
}
render() {
return (
<View>
<Text> 2 </Text>
</View>
)
}
}
const styles = StyleSheet.create({})
pages/HomeScreen
import React, { Component } from ‘react‘
import { Text, StyleSheet, View, Button } from ‘react-native‘
import { createStackNavigator, createAppContainer } from ‘react-navigation‘;
export default class HomeScreen extends Component {
static navigationOptions = {
title: ‘HomeScreen‘
}
render() {
return (
<View>
<Text> one </Text>
<Button title="go to two" onPress={() => this.props.navigation.navigate(‘Profile‘)} />
</View>
)
}
}
const styles = StyleSheet.create({})
终于使用成功了
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