在iOS中使用Swift更改UIAlertController的UIAlertAction按钮标题的字体大小

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

let action = UIAlertAction(title: "按钮标题", style: .default, handler: nil)
alertController.addAction(action)

if let titleLabel = action.value(forKey: "titleLabel") as? UILabel {
    titleLabel.font = UIFont.systemFont(ofSize: 18) // 设置字体大小
}

present(alertController, animated: true, completion: nil)