如何将Firebase格式错误显示为警报并显示给用户?

Question

所以我正在使用Firebase进行此登录和注册屏幕，每当我格式化电子邮件错误或不使密码6个字母长时，我如何将其显示为警报?

Answer 1

这是我在我的firebase代码中使用的，第一个是定义字段中必须包含的内容，第二个是弹出警告，如果它不符合注册或登录信息的要求，你想要它说什么。

@objc private func registerButtonTapped() {
emailField.resignFirstResponder()
passwordField.resignFirstResponder()
firstNameField.resignFirstResponder()
lastNameField.resignFirstResponder()
guard let firstName = firstNameField.text,
let lastName = lastNameField.text,
let email = emailField.text,
let password = passwordField.text,
!email.isEmpty,
!password.isEmpty,
!firstName.isEmpty,
!lastName.isEmpty,
password.count >= 6 else {
alertUserLoginError()
return
}

func alertUserLoginError(message: String = "Please enter all information to create a new account.") {
let alert = UIAlertController(title: "Woops",
message: message,
preferredStyle: .alert)
alert.addAction(UIAlertAction(title:"Dismiss",
style: .cancel, handler: nil))
present(alert, animated: true)
}