根据firebase
,当我使用onAuthStateChanged()
登录和注销时,我的firebase-authentication
方法console.log
会多次触发。它不应该只在登录时触发一次,在登出时触发一次。结果是,在注销时,会多次触发到上一页的导航。这是代码:
componentDidMount() {
fbAuth.onAuthStateChanged(user => this.loginFunc(user));
}
loginFunc(user) {
if (user) {
console.log('LOGGED IN');
}else {
console.log('LOGGED OUT');
this.props.navigation.navigate('FbLogin');
}
console.log('onAUTH LOGGED IN: ', user);
}
这就是控制台的样子。正如您所看到的,只需单击一次注销即可触发登录和注销。登录时,它会触发两次....
LOGGED OUT
FbLogin.js:46 onAUTH: null
LoggedIn.js:27 LOGGED OUT
LoggedIn.js:30 onAUTH LOGGED IN: null
FbLogin.js:44 LOGGED OUT
FbLogin.js:46 onAUTH: null
我的退出按钮如下所示:
<TouchableHighlight //LOGOUT
style={{
...
}}
onPress={() => {
fbAuth.signOut();
this.setState({ loginState: "You are logged out" });
}}
>
<Text>Logout</Text>
</TouchableHighlight>
答案 0 :(得分:6)
是的,这是正常的,onAuthStateChanged将继续触发, 我使用这段代码解决了这个问题:
var authFlag = true;
Firebase.onAuthStateChanged( user => {
if(authFlag) {
authFlag = false;
if (user) {
// Do something,
}
else {
// Alert.alert("Auth Error")
}
}
});