Question

我仍然试图在实践中绕过选项。我创建了一个用户表单，其中某些textFields可能未填写（用户的名字或姓氏）。

我的想法是，它应该像这样处理：

@IBAction func signUpButtonTapped(sender: AnyObject) {

    // Get information from register form
    let userEmail: String
    let userPassword: String
    let userPasswordRepeat: String
    let userFirstName: String?
    let userLastName: String?

    guard let email = userEmailAddressTextField.text,
    let password = userPasswordTextField.text,
    let passwordRepeat = userPasswordRepeatTextField.text else {
        return
    }

    userEmail = email
    userPassword = password
    userPasswordRepeat = passwordRepeat

    if let firstName = userFirstNameTextField.text, let lastName = userEmailAddressTextField.text {
        userFirstName = firstName
        userLastName = lastName
    }


    // Check if password is the same when registering
    if (userPassword != userPasswordRepeat) {
        displayAlertViewController(title: "Alert", message: "Passwords do not match")
        return
    }

    // If email, password, first name or last name is missing display alert
    if(userEmail.isEmpty || userPassword.isEmpty) {
        displayAlertViewController(title: "Alert", message: "All fields need to be filled in.")

        return
    }
}

但它告诉我，从不使用userFirstName和userLastName。我的问题是：

如果我使用可选绑定分配它们，为什么不使用它？这是解析文本字段数据的正确方法，或者我如何简化此代码？

Answer 1

userFirstName是可选的，但是只有当userFirstNameTextField.text不为nil时才给它一个值，所以你会失去那个Optional sense。在这种情况下，您应该在不检查它是否为零的情况下进行分配

userFirstName = userPasswordRepeatTextField.text

否则userFirstName应该只是String

文本字段输入的选项

1 个答案: