在iOS上进行UITextField验证的更好方法是什么？

class ViewController: UIViewController, UITextFieldDelegate {
    @IBOutlet weak var textField: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        textField.delegate = self
    }
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        let currentText = textField.text ?? ""
        let newText = (currentText as NSString).replacingCharacters(in: range, with: string)
        
        // 示例：验证邮箱格式
        if isValidEmail(newText) {
            return true
        } else {
            // 显示错误提示
            showError(message: "请输入有效的邮箱地址")
            return false
        }
    }
    
    func isValidEmail(_ email: String) -> Bool {
        let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
        let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
        return emailPred.evaluate(with: email)
    }
    
    func showError(message: String) {
        // 实现错误提示逻辑，例如显示一个UIAlertController
    }
}

func isValidPhoneNumber(_ phoneNumber: String) -> Bool {
    let phoneRegex = "^\\d{3}-\\d{3}-\\d{4}$"
    let phonePred = NSPredicate(format: "SELF MATCHES %@", phoneRegex)
    return phonePred.evaluate(with: phoneNumber)
}

func isPasswordStrong(_ password: String) -> Bool {
    // 至少8个字符，包含大小写字母和数字
    let passwordRegex = "^(?=.*[A-Z])(?=.*[a-z])(?=.*\\d)[A-Za-z\\d]{8,}$"
    let passwordPred = NSPredicate(format: "SELF MATCHES %@", passwordRegex)
    return passwordPred.evaluate(with: password)
}