How to repeat local notifications every day at different times

Question

I\'m working on a prayers application that enables users to set an alarm(local notification) for prayer times, i.e. the user sets the application to notify him for Fajr pray

Answer 1

The best way I found, so far, is to schedule the prayers for the next coming 12 days (12 days * 5 notifications = 60 notifications).

Note that iOS doesn't allow to schedule more than 64 notifications per app.

Once the user open the app, I remove all remaining notifications and re-schedule a new ones for the next 12 days.

The important thing the do, is to add a Background Fetch (job) to your application. In AppDelegate class add this code:

func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    // Should schedule new notifications from background
    PrayerTimeHelper().scheduleNotifications()
    completionHandler(.newData)
}

Modify didFinishLaunchingWithOptions method like this:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Setup Fetch Interval
//UIApplication.shared.setMinimumBackgroundFetchInterval(UIApplication.backgroundFetchIntervalMinimum)
    UIApplication.shared.setMinimumBackgroundFetchInterval(12 * 3600) // launch each 12 hours
}

Here is the methods that schedule the 12 days notifications:

/// Schedule notifications for the next coming 12 days.
/// This method is also called by Background Fetch Job
func scheduleNotifications() {
    DispatchQueue.global(qos: .background).async {

        DispatchQueue.main.async {
            self.removeAllPendingAndDeliveredNotifications()

            // create notifications for the next coming 12 days
            for index in 0..<12 {
                let newDate = Calendar.current.date(byAdding: .day, value: index, to: Date())!
                let prayers = self.getPrayerDatetime(forDate: newDate)

                // create notification for each prayer
                for iterator in 0..

This is working fine for my Prayer Times app.

I hope this will help ;)