UIAlertController中的内存泄漏关闭

let alertController = UIAlertController(title: "标题", message: "消息内容", preferredStyle: .alert)
let action = UIAlertAction(title: "确定", style: .default) { [weak self] (action) in
    // 在闭包中使用self时，需要使用弱引用
    self?.doSomething()
}
alertController.addAction(action)
self.present(alertController, animated: true, completion: nil)

let alertController = UIAlertController(title: "标题", message: "消息内容", preferredStyle: .alert)
let action = UIAlertAction(title: "确定", style: .default) { (action) in
    // 处理确定按钮点击事件
}
alertController.addAction(action)
self.present(alertController, animated: true, completion: nil)

// 在适当的时机手动关闭UIAlertController
alertController.dismiss(animated: true, completion: nil)