[英]Error [ React Native ]: Nothing was returned from render
Hello everyone so i have started learning react native and i was trying to implement DrawerNavigation.大家好,我已经开始学习 React Native,我正在尝试实现 DrawerNavigation。 While doing so I was trying to invoke my HomeStackScreen from externl js file but it is throwing error "Nothing was returned from render."
这样做时,我试图从 externl js 文件调用我的 HomeStackScreen,但它抛出错误“渲染没有返回任何内容。”
my App.js is ---->我的 App.js 是 ---->
const HomeStack = createStackNavigator();
const DetailStack = createStackNavigator();
const Drawer = createDrawerNavigator();
const HomeStackScreen = (navigation) => {
<HomeStack.Navigator screenOptions={{
headerStyle: {
backgroundColor: '#009387'
},
headerTintColor: '#fff',
headerTitleStyle: {
fontWeight: 'bold'
}
}}>
<HomeStack.Screen name="Home" component={HomeScreen} />
</HomeStack.Navigator>
}
const DetailStackScreen = (navigation) => {
<DetailStack.Navigator screenOptions={{
headerStyle: {
backgroundColor: '#009387'
},
headerTintColor: '#fff',
headerTitleStyle: {
fontWeight: 'bold'
}
}}>
<DetailStack.Screen name="Home" component={DashboardScreen}/>
</DetailStack.Navigator>
}
const App = () => {
return (
<NavigationContainer>
<Drawer.Navigator initialRouteName="Home">
<Drawer.Screen name="Home" component={HomeStackScreen} />
<Drawer.Screen name="Details" component={DetailStackScreen} />
</Drawer.Navigator>
{/* */}
</NavigationContainer>
);
};
export default App;
And this is my HomeScreen in which i was trying to make a login page.这是我的主屏幕,我试图在其中创建一个登录页面。 and here i have defined two text input and getting username and password from user and then i was trying to validate those credentials and display the alert message.
在这里,我定义了两个文本输入并从用户那里获取用户名和密码,然后我试图验证这些凭据并显示警报消息。
import React, { Component } from 'react'
import {
View,
Text,
TouchableOpacity,
Button,
Alert
} from 'react-native';
import { TextInput } from 'react-native-gesture-handler';
import styles from './styles'
export default class Home extends React.Component {
constructor(props) {
super(props)
}
state = {
username:"",
password:""
}
validateUser(){
if(this.state.username="admin" && this.state.password=="admin")
{
Alert.alert("Access","You have login",[{
text:'okay',
}])
} else {
Alert.alert("ERROR","Incorrect Username/Password",[{
text:'okay',
}])
}
}
render() {
const { mainConatiner, heading, input, } = styles
return (
<View style={mainConatiner}>
<Text style={heading}>Login to Application</Text>
<TextInput style={input} placeholder={"User Name"} onChangeText={text=>this.setState({username:text})}/>
<TextInput style={input} secureTextEntry={true} placeholder={"Password"} onChangeText={text=>this.setState({password:text})}/>
<Button title={"Login"} onPress={()=>this.validateUser()} />
</View>
);
}
}
You should return the content from the components, same thing should be done for DetailStackScreen as well.您应该从组件返回内容,对于 DetailStackScreen 也应该做同样的事情。
const HomeStackScreen = (navigation) => {
return (
<HomeStack.Navigator screenOptions={{
headerStyle: {
backgroundColor: '#009387'
},
headerTintColor: '#fff',
headerTitleStyle: {
fontWeight: 'bold'
}
}}>
<HomeStack.Screen name="Home" component={HomeScreen} />
</HomeStack.Navigator>
);
}
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