Question

Auth.auth().createUser(withEmail: email, password: password) { (authResult, error) in
    // ...
    guard let user = authResult?.user else { return }
}

我从Firebase复制并粘贴了该行，并被这些错误所困扰。

Errors

Answer 1

这些错误是由于您的电子邮件和密码是可选的（字符串与字符串）引起的。您需要先将它们拆开，然后再将它们传递到createUser中。您可以在进行调用以删除错误之前添加行guard let email = email, let password = password else { return }。然后根据获取值的方式，如果它们为null，则可能需要显示一条用户消息。

Answer 2

@耶利米是正确的。您正在尝试将“可选”字符串传递给Firebase函数。

可选含义，它可以具有值，也可以是 nil 。您可以通过两种不同的方式打开这两个字符串（电子邮件和密码）：

    guard let email = email?.trimmingCharacters(in: .whitespacesAndNewlines).lowercased(),
        !emailAddress.isEmpty else {
            // Uh oh email address is empty!  Show an error.
            return
    }

    guard let password = password, !password.isEmpty else {
        // Uh oh password is empty!  Show an error.
        return
    }
    login(with: emailAddress, password: password)

或：

    if let email = email?.trimmingCharacters(in: .whitespacesAndNewlines).lowercased(),
        let password = password, !email.isEmpty, !password.isEmpty {
        // Both email and password have values, do stuff:
    login(with: emailAddress, password: password)
            return
    } else {
        // Either email or password are empty, show an error
        return
    }

/// Asks Firebase to login our user.
private func login(with email: String, password: String) {
    Auth.auth().signIn(withEmail: email, password: password) { (user, error) in
        if let error = error, !error.isEmpty {
            // Error signing in!
        }

    }
}

Firebase用电子邮件和密码创建用户给我字符串必须解开错误

2 个答案: