ios - 如何在日历中设置默认提醒？

Question

尝试将偶数添加到我用户的日历中，但不确定如何设置默认提醒。到目前为止，我所拥有的是:

func createEvent(item: Item) {
        let eventStore = EKEventStore()

        eventStore.requestAccessToEntityType(EKEntityType.Event, completion: { (granted, error) in
            if granted && error == nil {
                let event = EKEvent(eventStore: eventStore)
                event.title = item.name
                event.startDate = item.StartDate
                event.endDate = item.endDate
                event.notes = item.description
                event.calendar = eventStore.defaultCalendarForNewEvents

                let alarm1hour = EKAlarm(relativeOffset: 3600) //1 hour
                let alarm1day = EKAlarm(relativeOffset: 86400) //1 day
                event.addAlarm(alarm1day)
                event.addAlarm(alarm1hour)

                // prompt user to add event (to whatever calendar they want)
                let controller = EKEventEditViewController()
                controller.event = event
                controller.eventStore = eventStore
                controller.editViewDelegate = self

                self.presentViewController(controller, animated: true, completion: nil)

            } else {
                self.dismissViewControllerAnimated(true, completion: {})
            }
        })
    }

我假设 alarm = alert，但这似乎没有任何作用。我如何设置事件前 1 天的提醒，以及事件前 1 小时的另一个提醒？

Answer 1

来自documentation对于 EKAlarm(relativeOffset:):

Negative offset values fire before the start of the event, while positive values fire after the start.

我会尝试以下方法:

let alarm1hour = EKAlarm(relativeOffset: -3600) //1 hour
let alarm1day = EKAlarm(relativeOffset: -86400) //1 day

注意:由于夏令时的变化，您可能希望为“前一天”警报使用绝对时间。