UIAlertController中的内存泄漏关闭

我在设置 UIAlertController ,我也看到过其他关于内存泄漏的帖子 UIAlertController .但我想不出如何更改代码以消除内存泄漏。我变了 itemSelected 从函数到计算属性,但它没有改变任何东西。

 protocol TriggerUIAlertController: class where Self: UIView {
        var itemsForPresenting: [String] { get }
        var titleForCancel: String { get }
        var titleForAlertController: String { get }
        var itemSelected: Int? {get set}
    }

    extension TriggerUIAlertController {

         func triggerUIAlerController() {
            let alertList = UIAlertController(title: titleForAlertController, message: nil, preferredStyle: .actionSheet)
            let closure = { (alert: UIAlertAction!) -> Void in
                let index = alertList.actions.index(of: alert)
                guard index != nil else {
                    return
                }

                ///produces memory leak, idk why though -> has to be checked
                self.itemSelected = index!
            }
            for x in itemsForPresenting {
                alertList.addAction(UIAlertAction(title: x, style: .default, handler: closure))
            }
            self.window?.rootViewController?.present(alertList,animated: true, completion: nil)
            let cancelAction = UIAlertAction(title: titleForCancel, style: .cancel, handler: nil)
            alertList.addAction(cancelAction)
        }
    }

顺便问一下:仪器在使用大约五分钟后总共使用50gb内存,这正常吗?