iOS通知触发器:每两周和/或每季度

Question

我似乎无法找到任何Apple文档用于这个确切的场景,我已经尝试了各种方法来做到这一点,我一直空着.

我想安排重复通知(iOS 10+如此UNCalendarNotificationTrigger或等效).
这些是本地通知 而非推送通知.

我的目标:

安排重复的通知:

• 一旦两周(例如每第二星期二)
• 每季度一次(例如,每3个月中的第1次)

我目前的方法:

这些触发器运行良好,并且易于实现(在Swift Playground中运行代码).

// Every day at 12pm
var daily = DateComponents()
daily.hour = 12
let dailyTrigger = UNCalendarNotificationTrigger(dateMatching: daily, repeats: true)
dailyTrigger.nextTriggerDate() // "Jan 4, 2017, 12:00 PM"

// Every Tuesday at 12pm
var weekly = DateComponents()
weekly.hour = 12
weekly.weekday = 3
let weeklyTrigger = UNCalendarNotificationTrigger(dateMatching: weekly, repeats: true)
weeklyTrigger.nextTriggerDate() // "Jan 10, 2017, 12:00 PM"

// The 1st of every month at 12pm
var monthly = DateComponents()
monthly.hour = 12
monthly.day = 1
let monthlyTrigger = UNCalendarNotificationTrigger(dateMatching: monthly, repeats: true)
monthlyTrigger.nextTriggerDate() // "Feb 1, 2017, 12:00 PM"

// Every 1st of February at 12pm
var yearly = DateComponents()
yearly.hour = 12
yearly.day = 1
yearly.month = 2
let yearlyTrigger = UNCalendarNotificationTrigger(dateMatching: yearly, repeats: true)
yearlyTrigger.nextTriggerDate() // "Feb 1, 2017, 12:00 PM"

但...

我似乎无法获得fortnightly或quarterly触发正常运行.

// Every second Tuesday at 12pm
// ... There is no "date.fortnight", is this possible?

// The 1st of every quarter at 12pm
var quarterly = DateComponents()
quarterly.hour = 12
quarterly.day = 4
// Values: 1, 2, 3 or 4 all produce the same "nextTriggerDate" - why?
quarterly.quarter = 4 
let quarterlyTrigger = UNCalendarNotificationTrigger(dateMatching: quarterly, repeats: true)
quarterlyTrigger.nextTriggerDate()

所以,要明确的是,我的问题是:

1. 是否有可能获得每两周重复一次的通知？
2. 我们如何每季度获得一次触发器？

由于DateComponents()有一个quarter单位,我认为可以quarterly触发.然而,对于两周一次的提醒,我甚至不确定这是否可能......

任何见解将不胜感激!

Answer 1

我没有看到任何触发两周通知的直接选项。我的建议。

1) 是否有可能获得每两周重复一次的通知？

我提出两个选择：

1. 我们可以用UNTimeIntervalNotificationTrigger两周的时间间隔重复通知吗？下面的例子

   let timeInterValFor2Weeks = 1190507.790425003
   
   let intervalTrigger = UNTimeIntervalNotificationTrigger(timeInterval: timeInterValFor2Weeks, repeats: true)//"Jan 3, 2017, 5:24 PM"
   
   intervalTrigger.nextTriggerDate() //"Jan 17, 2017, 12:05 PM"
   

2. 安排两个UNCalendarNotificationTrigger触发器，应该触发一个月的第一天和第三天。例如，它应该在一个月的第一个星期日和第三个星期日发出通知。

   var fortnightPart1 = DateComponents()
   fortnightPart1.weekday = 1 //(Day..here Sunday)
   fortnightPart1.weekdayOrdinal = 2 //= n == (nth Day in the month...here 2nd Sunday in every month month)
   fortnightPart1.hour = 12
   
   let fortnightTrigger = UNCalendarNotificationTrigger(dateMatching: fortnightPart1, repeats: true)
   fortnightPart1.nextTriggerDate()
   

2） 我们如何获得一个季度一次的触发器？

如果没有可用的直接选项，那么我建议使用与上述相同的解决方案。