我在使用 react 导航 v5。
我想在用户按 "OK "键时,从警报中导航到登录界面,但目前出现错误>>.找不到变量:导航。
找不到变量:导航
功能如下。
async function handleSubmit(navigation) {
try {
const value = await AsyncStorage.getItem('storage_useremail');
if (value !== null) {
fetch('https://xxxxxx/logout', {
method: 'POST',
headers: {
Accept: 'application/json',
'Content-Type': 'application/json',
},
body: JSON.stringify({
email: value,
}),
}).then(res => res.json())
.then(res => {
// console.log(res.err_code)
if (res.err_code == '0000') {
Alert.alert('Notice',res.message + " (" + res.err_code + ")",[{ text: 'Yes', onPress: () => navigation.navigate('Login')} ]);
} else {
Alert.alert("Response: " + res.err_code + " - " + res.message);
}
})
}
} catch (error) {
// Error retrieving data
}
}
function HomeNavigator() {
return (
<AppStack.Navigator mode="modal" initialRouteName="Login" screenOptions={({ route, navigation }) => ({
headerStyle: {
backgroundColor: '#fb5b5a',
borderBottomWidth: 0,
},
headerRight: () => (
<Button
onPress={() => handleSubmit()}
// onPress={() => navigation.navigate('Login')}
title="Logout"
color="#fff"
/>
),
})}>
<AppStack.Screen
name="Home"
component={HomeScreen}
options={{
title: 'Home',
}}
/>
<AppStack.Screen
name="Memory"
component={MemoryScreen}
options={{
title: 'Memory',
}} />
</AppStack.Navigator>
);
}
navigation.navigate('Login') << 这部分不能导航。
谁能帮帮我?
谢谢
因为你没有把导航传递给handleSubmit。
function HomeNavigator() {
return (
<AppStack.Navigator mode="modal" initialRouteName="Login" screenOptions={({ route, navigation }) => ({
headerStyle: {
backgroundColor: '#fb5b5a',
borderBottomWidth: 0,
},
headerRight: () => (
<Button
onPress={() => handleSubmit(navigation)} // <<<<<<<<<<<< Here
// onPress={() => navigation.navigate('Login')}
title="Logout"
color="#fff"
/>
),
})}>
<AppStack.Screen
name="Home"
component={HomeScreen}
options={{
title: 'Home',
}}
/>
<AppStack.Screen
name="Memory"
component={MemoryScreen}
options={{
title: 'Memory',
}} />
</AppStack.Navigator>
);
}
onPress应该是一个函数声明,当按下时将被触发
onPress: () => navigation.navigate('Login')