ios - 火力地堡 iOS : createUserWithEmail isn't generating userId (uid)

Question

我是 firebase 的新手，我正在尝试学习如何创建用户。我的问题是，当我通过按钮使用 createUserWithEmail 完成 block 时，出于某种原因，未生成唯一标识符 uid。这使我无法将关联的用户名和密码存储在 JSON 树中的 uid 下。我的代码如下(我使用“let databaseRef = FIRDatabase.database().reference()”在单独的 swift 文件中将 databaseRef 定义为全局常量)

@IBAction func createAccount(sender: AnyObject) {

    var username = usernameField.text
    var email = emailField.text
    var password = passwordField.text
    if username != "" && email != "" && password != "" {
        FIRAuth.auth()?.createUserWithEmail(email!, password: password!, completion: { (user, error) in
            databaseRef.child("users/(user.uid)/username").setValue(username)
            databaseRef.child("users/(user.uid)/password").setValue(password)
            databaseRef.child("users/(user.uid)/uid").setValue(user?.uid) 
        })
    } else {
        print("please complete all fields")
    }
}

我知道没有生成 uid 有两个原因。首先，当我运行上面的代码并为我的每个文本字段输入值时，应用程序崩溃了。其次，如果我删除处理设置值的代码并将其替换为 print(user.uid)，则返回 nil 值。我错过了什么？我可以理解uid是创建用户的一个非常重要的部分。

***这是我想出的解决方案

 @IBAction func createAccount(sender: AnyObject) {

    var username = usernameField.text
    var email = emailField.text
    var password = passwordField.text

    if username != "" && email != "" && password != "" {

        FIRAuth.auth()?.createUserWithEmail(email!, password: password!, completion: { (user, error) in

             if let user = FIRAuth.auth()?.currentUser {

                databaseRef.child("users/\(user.uid)/username").setValue(username)
                databaseRef.child("users/\(user.uid)/password").setValue(password)
                databaseRef.child("users/\(user.uid)/email").setValue(email)

                print(user.uid)

            } else {

                print("no user")

            }

        })


    } else {

        print("please complete all fields")

    }

Answer 1

任何感兴趣的人的 Swift 4, 2018 解决方案:

Auth.auth().createUser(withEmail: email, password: password) { (user, error) in
    // guard against errors and optionals
    guard error == nil else { return }
    guard let user = user else { return }
    let userObject = [
        "uid": user.uid,
        "username": username,
        "password": password, // I don't recommend storing passwords like this by the way
        "email": email
        ] as [String:Any]
    databaseRef.child("users").child(user.uid).setValue(userObject)
}