swift 种的EqualTo

                if alertController.isEqual(ADAlertControllerPriorityQueue.getMax()) == true {
                           //若当前要隐藏的 alertController 是最前面的,直接执行deleteMax,
                           _ = ADAlertControllerPriorityQueue.deleteMax()
                       }else{
                           let tempItems = (weakSelf?.queue!)! as NSArray
                           let deleteIndex = tempItems.index(of: alertController)
                           ADAlertControllerPriorityQueue.deleteAtIndex(deleteIndex)
                       }