我正在嘗試使用記住我的切換開關將用戶電子郵件與異步存盤一起存盤。我不確定為什么我用 getRememberedUser 呼叫檢索“null”？我究竟做錯了什么？這是 React Native ，我也有一個 redux 存盤（這里沒有真正使用），但不確定這是否重要。謝謝！
const [userEmail, setuserEmail] = useState("");
const [rememberMe, setrememberMe] = useState(false);
const rememberUser = async () => {
try {
await AsyncStorage.setItem("userEmail", userEmail);
console.log("stored");
} catch (error) {
// Error saving data
}
};
const forgetUser = async () => {
try {
await AsyncStorage.removeItem("userEmail");
console.log("forgotten");
} catch (error) {
// Error removing
}
};
const getRememberedUser = async () => {
try {
const value = await AsyncStorage.getItem("userEmail");
console.log(value)
if (value !== null) {
// We have username!!
setuserEmail(value);
}
} catch (error) {
// Error retrieving data
}
};
<Input
id="email"
label="E-Mail"
keyboardType="email-address"
required
email
autoCapitalize="none"
errorText="Please enter a valid email address."
onInputChange={inputChangeHandler}
initialValue={userEmail}
/>
<Switch
value={rememberMe}
onValueChange={(value) => toggleRememberMe(value)}
/>
<Text>Remember Me</Text>
<Button
title="get uersname"
onPress={() => {
getRememberedUser();
}}
></Button>
uj5u.com熱心網友回復：
保存時需要字串化，
await AsyncStorage.setItem("userEmail", JSON.stringify(userEmail));
并在檢索時決議
const value = await AsyncStorage.getItem("userEmail");
const userEmail = JSON.parse(value);
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