如何在文本字段中不允许空格

Question

这是我的代码我希望用户名不要有空格和小写 示例（wizkhalifa）

    func textField(_ textFieldToChange: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
            if textFieldToChange == username {
                let characterSetNotAllowed = CharacterSet.whitespaces
                if let _ = string.rangeOfCharacter(from:NSCharacterSet.uppercaseLetters) {
                    return false
                }
                if let _ = string.rangeOfCharacter(from: characterSetNotAllowed, options: .caseInsensitive) {
                    return false
                } else {
                    return true
                }
}

 if  UserNameField.text != nil, emailField.text != nil, passwordField.text != nil, rePassword.text != nil && passwordField.text == rePassword.text {
                Auth.auth().createUser(withEmail: emailField.text!, password: passwordField.text!, completion: { (user, error) in
                    if error != nil {
                        AlertController.showAlert(self, titel: "Error", message: " Fill all fields \nUser exists  ")
                        return
                    }

Answer 1

您需要检查 2 件事，您可以在尝试创建用户和/或用户键入时调用的方法中进行检查。

首先检查，空格：

if let text = UserNameField.text {
    if text.components(separatedBy: " ").count > 1 && text.lowercased() != textField.text {// add your other tests on this line
        // the text is in lowercase without space character and your tests pass
        Auth.auth().createUser(withEmail: emailField.text!, password: passwordField.text!, completion: { (user, error) in
             // check if there is an error
        })
    } else {
        AlertController.showAlert(self, titel: "Error", message: " Fill all fields \nUser exists  ")

}

这是 OP 的版本及其代码：

if  UserNameField.text != nil, emailField.text != nil, passwordField.text != nil, rePassword.text != nil && passwordField.text == rePassword.text && UserNameField.text.components(separatedBy: " ").count <= 1 && UserNameField.text.lowercased() == UserNameField.text {
    Auth.auth().createUser(withEmail: emailField.text!, password: passwordField.text!, completion: { (user, error) in
        if error != nil {
            AlertController.showAlert(self, title: "Error", message: " Fill all fields \nUser exists  ")
            return
        } else {
            // all good
        }
    })
} else {
    AlertController.showAlert(self, title: "Error", message: " Fill all fields \nUser exists  ")
}