如何按 nextTriggerDate 对 UNNotificationRequests 数组进行排序

Question

我有一个 UNNotificationRequest 的数组。我想按 nextTriggerDate.

对它们进行排序

据我了解，我会使用 array.sorted(by:predicate)

对数组进行排序

let sortedNotifications = notificationRequests.sorted(by: { [=13=].trigger.nextTriggerDate?.compare(.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投射到UNCalendarNotificationTrigger中。据我所知，不能在谓词中完成。

有什么想法吗？

Answer 1

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

创建 Tuple

// 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({[=10=]})

                // you will get Tuple (request,Date) ,sort them by date  
               let sortedTuple = requestWithDateTuple.sorted(by: { [=10=].1?.compare(.1!) == .orderedAscending })

// sorted request only 
let requestSorted =  sortedTuple.map({[=10=].0})

如何按 nextTriggerDate 对 UNNotificationRequests 数组进行排序

How to sort an array of UNNotificationRequests by nextTriggerDate

sorting

nspredicate

ios

unnotificationrequest

unnotificationtrigger