带有文本字段验证警报的UIAlertController在swift ios中显示问题

let alertController = UIAlertController(title: "标题", message: "消息", preferredStyle: .alert)

alertController.addTextField { textField in
    textField.placeholder = "请输入文本"
    textField.isSecureTextEntry = true // 可选，用于输入密码等敏感信息
}

let confirmAction = UIAlertAction(title: "确认", style: .default) { _ in
    if let textFields = alertController.textFields, let textField = textFields.first {
        if let inputText = textField.text {
            // 进行文本字段验证逻辑
            if inputText.isEmpty {
                // 输入为空时的处理
            } else {
                // 输入非空时的处理
            }
        }
    }
}
alertController.addAction(confirmAction)

if let rootViewController = UIApplication.shared.keyWindow?.rootViewController {
    rootViewController.present(alertController, animated: true, completion: nil)
}