Scheduling notification with Swift 3 for an array of dates

Question

I have an array containing my dates. I want to schedule notifications for those days at 6.30am.

I followed the appcoda tutorial which helps scheduling the notification upon input from a datepicker which is great, but I am a bit uncertain on how to call my function to schedule the notification for only the given days.

So my question is how and where to call the function?

the days are consecutive days
can I give the function a start date and repeat it with the number of items in the array?

Below is my function:

    func scheduleNotification(at date: Date) {
        let calendar = Calendar(identifier: .gregorian)
        let components = calendar.dateComponents(in: .current, from: date)
        let newComponents = DateComponents(calendar: calendar, timeZone: .current, month: components.month, day: components.day, hour: 6, minute: 30)
        let trigger = UNCalendarNotificationTrigger(dateMatching: newComponents, repeats: false)

        let content = UNMutableNotificationContent()
        content.title = "Advent Calendar"
        content.body = "Just a reminder to open your present!"
        content.sound = UNNotificationSound.default()

        let request = UNNotificationRequest(identifier: "textNotification", content: content, trigger: trigger)
 UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
        UNUserNotificationCenter.current().add(request) {(error) in
            if let error = error {
                print("Uh oh! We had an error: \(error)")
            }
        }
    }

Ben S · Accepted Answer · 2016-12-01T23:02:59.910

Right, so after consulting with a developer @gklka I have decided to use a simple for loop that repeats 24 times ) and it passes the index to the function's day property, where I preconfigured the hour, minute, year and month like so:

func scheduleNotification(day: Int) {

    var date = DateComponents()
    date.year = 2016
    date.month = 11
    date.day = day
    date.hour = 6
    date.minute = 30

    let trigger = UNCalendarNotificationTrigger(dateMatching: date, repeats: false)
}

and the for loop:

for index in 1...24 {
        scheduleNotification(day: index)
    }

Since I had everything set up int AppDelegate I call the function in didFinishLaunchingWithOptions

Update on the 1st of Dec.

So I left everything as is but no notification has occurred in the morning. . I looked into my code to figure out why. There were 2 issues.

I had a line of code within my function that would delete any previous notification set up while iterating through my loop, so I had the below line of code commented out, but things still did not work as expected. UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
I found that I have scheduled my notification with the same requestIdentifier, which basically left me with only 1 notification for the last day. I simply added the index at the end of my custom ID variable with string interpolation, like so: let requestId = "textNotification\(day)"

how does this new func scheduleNotification interact with the previous function in your question where you create the notification? Is your alert content the same for all alerts — tylerSF, Feb 03 '17 at 14:30
@tylerSF, it creates all the 24 notifications at once, scheduled for each day. The app contains a new gift every day, therefore the notifications is the same, just to bring the information to the user's attention. — Ben S, Feb 19 '17 at 12:18

Scheduling notification with Swift 3 for an array of dates

1 Answers1