Schedule future UNUserNotificationCenter with condition and limits (iOS) - ios

Question

I know this has been asked several times but there is no concrete solution I have found over the SO.I am working on iOS app and I am using userNotification and all things are working fine but then I have to use the recurring/repeat notifications so here are the conditions that I have to fulfill and wondering how
Case: Show notification to user to check for specific task if it is completed.
show notification everyday until specified date is arrived
Show notification every monday until specified date is arrived
Show notification monthly every specified day until specifed date is arrived
Problem:
I do not know how to schedule repeat notification for given conditions
Is there any limit of notification per app? suppose I have 100 of task and each task may have any of the notification bounded with the uppar given conditions.
Please tell me what could be done? and how I can fulfill my requirements.

Answer 1

show notification everyday until specified date is arrived
This is to display a message at a specific time every day
var dateComponents = DateComponents()
dateComponents.hour = 10
dateComponents.minute = 30
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
if trigger.nextTriggerDate() >= your_specified_date {
return
}
Is there any limit of notification per app? suppose I have 100 of task
and each task may have any of the notification bounded with the uppar
given conditions.
Yes, there are limits. The system keeps the soonest-firing 64 notifications (with automatically rescheduled notifications counting as a single notification) and discards the rest.

Answer 2

Notification schedule for custom date with body
func schedulingNotificationForCustomDate(body: String, currentDate: Date) {
// Configure User Notification Center
let center = UNUserNotificationCenter.current()
let content = UNMutableNotificationContent()
content.title = ""
content.subtitle = ""
content.body = body
content.categoryIdentifier = "WeekDay notification"
content.userInfo = ["NotificationID": "WeekDay notification", "repeat": true, "reschedule": false]
content.sound = UNNotificationSound.default
let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: currentDate.timeIntervalSince1970, repeats: true)
let request = UNNotificationRequest(identifier: "WeekDay notification", content: content, trigger: trigger)
center.add(request, withCompletionHandler: nil)
}
Create date as per requirement
extension Date {
static func createDate(weekday: Int, hour: Int, minute: Int, year: Int) -> Date {
let calendar = Calendar.current
var components = DateComponents()
components.hour = hour
components.minute = minute
components.year = year
components.month = calendar.component(.month, from: Date())
components.day = calendar.component(.day, from: Date())
components.weekday = weekday // sunday = 1 ... saturday = 7
components.timeZone = .current
return calendar.date(from: components)!
}
}
Get the next date for scheduling repeat notification
extension Date {
static func nextNthDateFromCurrentDate(FromDate: Date, numberOfDays: Int) -> Date {
return Calendar.current.date(byAdding: .day, value: numberOfDays, to: FromDate)! // where numberOfDays is the number of days for the next date
}
}
For scheduling notification call
self.schedulingNotificationForCustomDate(body: body, currentDate: Date.nextNthDateFromCurrentDate(FromDate: Date.createDate(weekday: 2, hour: 11, minute: 00, year: year), numberOfDays: 14))

Answer 3

There is no end date specification on repeating local notifications, so unfortunately you will need to build something custom. However this is a limit of 64 notifications you may queue up according to Apple.
An app can have only a limited number of scheduled notifications; the
system keeps the soonest-firing 64 notifications (with automatically
rescheduled notifications counting as a single notification) and
discards the rest.
I would have an extension that can grab the dates between two dates like so:
extension Date {
static func dates(from fromDate: Date, to toDate: Date) -> [Date] {
var dates: [Date] = []
var date = fromDate
while date <= toDate {
dates.append(date)
guard let newDate = Calendar.current.date(byAdding: .day, value: 1, to: date) else { break }
date = newDate
}
return dates
}
}
Then you can grab the dates that you need and iterate through each one to create a notification:
let threeDaysFromNowExample = Calendar.current.date(byAdding: .day, value: 3, to: Date())!
let dates = Date.dates(from: Date(), to: threeDaysFromNowExample)
for date in dates {
let notification = UILocalNotification()
notification.fireDate = date
notification.alertBody = "Your alert here!"
notification.soundName = UILocalNotificationDefaultSoundName
UIApplication.shared.scheduleLocalNotification(notification)
}
Did not test this code, but should get you started. You may need to massage the extension some to add the ability to grab only Mondays for example.