ios - 如何通过nextTriggerDate对UNNotificationRequests数组进行排序

我有一个UNNotificationRequest数组。我想按nextTriggerDate对其进行排序。

据我了解，我将使用array.sorted(by:predicate)对数组进行排序
let sortedNotifications = notificationRequests.sorted(by:{ $0.trigger.nextTriggerDate?.compare($1.trigger.nextTriggerDate!) == .orderedAscending })
但是，问题是.trigger没有nextTriggerDate属性。

为了获得nextTriggerDate，我必须提取触发器并将其转换为UNCalendarNotificationTrigger。据我所知，这不能在谓词中完成。

有什么想法吗？

最佳答案

您可以使用UNNotificationRequest和nextTriggerDate Tuple创建(UNNotificationRequest,nextTriggerDate)

// get request with date Tuple -->  example : (value0,value1)

let requestWithDateTuple =  notificationRequests.map({ (req) -> (UNNotificationRequest,Date?)? in
                    guard let trigger = req.trigger as? UNCalendarNotificationTrigger else {
                        return nil
                    }
                    return (req,trigger.nextTriggerDate())
                }).compactMap({$0})

                // you will get Tuple (request,Date) ,sort them by date
               let sortedTuple = requestWithDateTuple.sorted(by: { $0.1?.compare($1.1!) == .orderedAscending })

// sorted request only
let requestSorted =  sortedTuple.map({$0.0})