Repeating Local Notifications for Specific Days of Week (Swift 3 iOS 10)

Repeating local notifications for specific days of week (Swift 3 IOS 10)

You can use below function to get Date from selected picker value:

    //Create Date from picker selected value.
    func createDate(weekday: Int, hour: Int, minute: Int, year: Int)->Date{

        var components = DateComponents()
        components.hour = hour
        components.minute = minute
        components.year = year
        components.weekday = weekday // sunday = 1 ... saturday = 7
        components.weekdayOrdinal = 10
        components.timeZone = .current

        let calendar = Calendar(identifier: .gregorian)
        return calendar.date(from: components)!
    }

    //Schedule Notification with weekly bases.
    func scheduleNotification(at date: Date, body: String, titles:String) {

        let triggerWeekly = Calendar.current.dateComponents([.weekday,.hour,.minute,.second,], from: date)

        let trigger = UNCalendarNotificationTrigger(dateMatching: triggerWeekly, repeats: true)

        let content = UNMutableNotificationContent()
        content.title = titles
        content.body = body
        content.sound = UNNotificationSound.default()
        content.categoryIdentifier = "todoList"

        let request = UNNotificationRequest(identifier: "textNotification", content: content, trigger: trigger)

        UNUserNotificationCenter.current().delegate = self
        //UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
        UNUserNotificationCenter.current().add(request) {(error) in
            if let error = error {
                print("Uh oh! We had an error: \(error)")
            }
        }
    }

After getting a value from picker pass picker hour, minute and year with selected week day as (Sunday = 1, Monday = 2, Tuesday = 3, Wednesday = 4, thursday = 5, Friday = 6, Saturday = 7) to function func createDate(weekday: Int, hour: Int, minute: Int, year: Int) to get notification fire date on weekly bases, and after getting date call function func scheduleNotification(at date: Date, body: String, titles:String) for schedule a notification.

How to repeat local notifications on specific days of the week (iOS Swift 3)

The thing that I'm having trouble with now is being able to fire the local notification on specific days of the week

In iOS 10, a UNCalendarNotificationTrigger is formed using DateComponents. This means you can specify as much or as little of the date-time in question as you wish. Thus, if you specify a specific weekday and a time (hour and minutes), and nothing else, you'll repeat at that time on that day of the week.

If you also need to repeat on a different day of the week, just make another notification.

iOS local notification base on day, time frame and number of times?

If you want to schedule multiple notifications, you need to create multiple notification triggers and register them.

something like:

// Simple extension if you have to create multiple of the same object
extension DateComponents {
   static func triggerFor(hour: Int, minute: Int) -> DateComponents {
      var component = DateComponents()
      component.calendar = Calendar.current
      component.hour = hour
      component.minute = minute
      component.weekday = 1
      return component
   }
}

// Add each trigger into an array with the correct date component
let triggers = [
    UNCalendarNotificationTrigger(dateMatching: DateComponents.triggerFor(hour: 1, minute: 0), repeats: true),
    UNCalendarNotificationTrigger(dateMatching: DateComponents.triggerFor(hour: 2, minute: 0), repeats: true),
    UNCalendarNotificationTrigger(dateMatching: DateComponents.triggerFor(hour: 3, minute: 0), repeats: true),
    UNCalendarNotificationTrigger(dateMatching: DateComponents.triggerFor(hour: 4, minute: 0), repeats: true),
    UNCalendarNotificationTrigger(dateMatching: DateComponents.triggerFor(hour: 5, minute: 0), repeats: true)
]

// Iterate through the array and register the notification with the system
for trigger in triggers {
    // Create the content of the notification
    let content = UNMutableNotificationContent()
    content.title = "My Notification Title"
    content.body = "Body of Notification"

    // Create the request
    let uuidString = UUID().uuidString
    let request = UNNotificationRequest(identifier: uuidString, 
                content: content, trigger: trigger)

    // Schedule the request with the system.
    let notificationCenter = UNUserNotificationCenter.current()
    notificationCenter.add(request) { (error) in
       if error != nil {
          // Handle any errors.
       }
    }
}

Repeat UserNotification every specific day of week for iOS 10

Triggering date format is not proper to repeat notification in a day of a week.
Your current trigger date components includes year,month,day, etc so this notification repeat in each year in that particular month and day.Change trigger date like mentioned below to repeat notification in a day of a week.

 let triggerDate =  Calendar.current.dateComponents([.weekday,.hour,.minute], from: date as Date)

I want to send a notification on specific days of the week

You can use UNCalendarNotificationTrigger and create a trigger. You can set date, timezone, year, month, day, hour, minute and if need repeat or not.
Next, create a request UNNotificationRequest, and finish adding the request to Notification Center.

Like this:

import UserNotifications

let trigger = UNCalendarNotificationTrigger(dateMatching: DateComponents(calendar: Calendar.current, timeZone: Calendar.current.timeZone, year: 2019, month: 1, day: 14, hour: 11, minute: 55, repeats: true )
            let request = UNNotificationRequest(identifier: "identifier", content: content, trigger: trigger)
            UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)

You can create (schedule) only 64 local notifications

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