问题描述
我想提醒正在注册的用户，他们选择的电子邮件地址已经在我们的用户库中;我怎么能比较他们（期望）的电子邮件给我的用户列表中的用户之前（while）他们注册？在哪里存储用户，以及如何访问数据节点？
您应该有一个包含用户的用户节点其他有关它们的信息。
登录凭据存储在Firebase的内部，因此您无法直接访问它们。有一个用户节点允许访问关于用户的其他数据（并且可以仔细检查是否已经在使用电子邮件地址）。
用户
uid_00001
名称：Frank
邮箱：[email protected]
fav_movie：飞机
uid_00002
名称：加藤
邮箱：[email protected]
fav_movie：粉红豹
使用上述结构，您可以简单地查询电子邮件地址，如果有匹配，不允许他们使用它。
这是非常常见的做法，并且有很多关于在Firebase网站上处理用户的信息。
检出将用户数据存储在此链接中
I want to alert users who are registering that their choice of email address is already in our userbase; how can I compare their (desired) email to the users in my user list before (while) they register? Where exactly are the users stored and how can I access taht datanode?
You should have a users node that contains your users and other info about them.
Login credentials are stored internally in firebase so you don't have direct access so them. Having a users node allows access to other data about the user (and can double check to see if an email address is already in use).
users
uid_00001
name: "Frank"
email: "[email protected]"
fav_movie: "Airplane"
uid_00002
name: "Kato"
email: "[email protected]"
fav_movie: "Pink Panther"
Using the above structure, you can simply query for the email address and if there's a match don't allow them to use it.
This is very common practice and there's a lot of information about handling users on the Firebase website.
Check out Storing User Data in this link
https://www.firebase.com/docs/ios/guide/user-auth.html
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