Notification in Swift Every Day at a Set Time

How to send a localNotification at a specific time everyday, even if that time has passed?

Updated @Paulw11 's answer to Swift 3.0 and wrapped up in a function:

/// Set up the local notification for everyday
/// - parameter hour: The hour in 24 of the day to trigger the notification
class func setUpLocalNotification(hour: Int, minute: Int) {

    // have to use NSCalendar for the components
    let calendar = NSCalendar(identifier: .gregorian)!;

    var dateFire = Date()

    // if today's date is passed, use tomorrow
    var fireComponents = calendar.components( [NSCalendar.Unit.day, NSCalendar.Unit.month, NSCalendar.Unit.year, NSCalendar.Unit.hour, NSCalendar.Unit.minute], from:dateFire)

    if (fireComponents.hour! > hour 
        || (fireComponents.hour == hour && fireComponents.minute! >= minute) ) {

        dateFire = dateFire.addingTimeInterval(86400)  // Use tomorrow's date
        fireComponents = calendar.components( [NSCalendar.Unit.day, NSCalendar.Unit.month, NSCalendar.Unit.year, NSCalendar.Unit.hour, NSCalendar.Unit.minute], from:dateFire);
    }

    // set up the time
    fireComponents.hour = hour
    fireComponents.minute = minute

    // schedule local notification
    dateFire = calendar.date(from: fireComponents)!

    let localNotification = UILocalNotification()
    localNotification.fireDate = dateFire
    localNotification.alertBody = "Record Today Numerily. Be completely honest: how is your day so far?"
    localNotification.repeatInterval = NSCalendar.Unit.day
    localNotification.soundName = UILocalNotificationDefaultSoundName;

    UIApplication.shared.scheduleLocalNotification(localNotification);

}

UNNotificationRequest to send local notification daily at a specific time

You can use UNCalendarNotificationTrigger for creating a notification that fires repeatedly using UNUserNotificationCenter. You can do something like this. The trick is to only have the time component in the Trigger date.

        let center = UNUserNotificationCenter.current()

        let content = UNMutableNotificationContent()
        content.title = "Attention!"
        content.body = "Your daily alert is ready for you!"
        content.sound = UNNotificationSound.default

        let identifier = "com.yourdomain.notificationIdentifier"

        var triggerDate = DateComponents()
        triggerDate.hour = 18
        triggerDate.minute = 30
        let trigger = UNCalendarNotificationTrigger(dateMatching: triggerDate, repeats: true)

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

        center.add(request, withCompletionHandler: { (error) in
            if let error = error {
                // Something went wrong
                print("Error : \(error.localizedDescription)")
            } else {
                // Something went right
                print("Success")
            }
        })

How do I schedule a notification at a specific time, and then repeat it every x amount of time?

From what I know it's not possible to repeat a notification every X seconds (or something else) after a specific date.

I think the "best" option here is to use UNCalendarNotificationTrigger instead and schedule 60/5 = 12 notification (so 1 every 5 seconds) starting from the given date.

Something like this:

// this is your reference date - here it's now + 5 seconds just for this example
var referenceDate = Calendar.current.date(byAdding: .second, value: 5, to: Date())!
for i in 0...11 { // one every 5 seconds, so total = 12
    let content = UNMutableNotificationContent()
    content.title = "Notif \(i)"
    content.body = "Body"

    var dateComponents = DateComponents(calendar: Calendar.current)
    // 5 seconds interval here but you can set whatever you want, for hours, minutes, etc.
    dateComponents.second = 5
    //dateComponents.hour = X
    // [...]
    
    guard let nextTriggerDate = dateComponents.calendar?.date(byAdding: dateComponents, to: referenceDate),
          let nextTriggerDateCompnents = dateComponents.calendar?.dateComponents([.second], from: nextTriggerDate) else {
        return
    }
    referenceDate = nextTriggerDate

    print(nextTriggerDate)
    let trigger = UNCalendarNotificationTrigger(dateMatching: nextTriggerDateCompnents, repeats: true)
    let request = UNNotificationRequest(identifier: "notif-\(i)", content: content, trigger: trigger)
    UNUserNotificationCenter.current().add(request)
}

Now based on that, you would need to handle when a user taps one of the notifications in order to cancel all the others. But that's another topic here and I leave it up to you to find the logic for that.

how to set local notifications between 8am and 8pm every day

Unfortunately you do need to add a notification request for each 30 minute interval in the 8am-8pm window. What is your aversion to this approach? It's a simple for-loop. Instead of using a UNTimeIntervalNotificationTrigger you would use a UNCalendarNotificationTrigger.

let notificationCenter = UNUserNotificationCenter.current()
notificationCenter.removeAllDeliveredNotifications()
notificationCenter.removeAllPendingNotificationRequests()

let startHour = 8
let totalHours = 12
let totalHalfHours = totalHours * 2

for i in 0...totalHalfHours {
    var date = DateComponents()
    date.hour = startHour + i / 2
    date.minute = 30 * (i % 2)
    print("\(date.hour!):\(date.minute!)")

    let notification = UNMutableNotificationContent()
    notification.title = "You should have some water"
    notification.body = "It has been a long time since you had some water, why don't you have some."
    notification.categoryIdentifier = "reminder"
    notification.sound  = .default

    let trigger = UNCalendarNotificationTrigger(dateMatching: date, repeats: true)
    let uuidString = UUID().uuidString
    let request = UNNotificationRequest(identifier: uuidString, content: notification, trigger: trigger)
    notificationCenter.add(request, withCompletionHandler: nil)
}

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.
       }
    }
}

Repeating local notification daily at a set time with swift

You have to provide an NSCalendarUnit value like “HourCalendarUnit” or “DayCalendarUnit” for repeating a notification.

Just add this code to repeat the local notification daily :

notification.repeatInterval = NSCalendarUnit.CalendarUnitDay

How do I set up a repeating daily notification with different content each time?

Ok, here is the solution for this.

It is NOT possible to schedule a repeating notification with a random content each day. The content is defined when the notification is scheduled, and cannot be changed later.

What you CAN do it schedule up to 64 notifications in advance though. So you can schedule 64 unique notifications for the next 64 days, and then whenever you open the app check how many remain, and fill up the notification-schedule up to 64 again.

If you don't open the app after 64 days the notifications stop coming though :P

How do I send local notifications at a specific time in Swift?

This is an example of what I have used for scheduling local notifications using Notification Centre.

let center = UNUserNotificationCenter.current()

let content = UNMutableNotificationContent()
content.title = "My title"
content.body = "Lots of text"
content.sound = UNNotificationSound.default()
content.categoryIdentifier = "yourIdentifier"
content.userInfo = ["example": "information"] // You can retrieve this when displaying notification

// Setup trigger time          
var calendar = Calendar.current
calendar.timeZone = TimeZone.current
let testDate = Date() + 5 // Set this to whatever date you need
let trigger = UNCalendarNotificationTrigger(dateMatching: testDate, repeats: false)

// Create request               
let uniqueID = UUID().uuidString // Keep a record of this if necessary
let request = UNNotificationRequest(identifier: uniqueID, content: content, trigger: trigger)
center.add(request) // Add the notification request

The Date object (represented by testDate above) can be whatever date you want. It is often convenient to create it from DateComponents.

You will need to ask permission for local notifications in the App Delegate at startup to allow this to work. Here is an example.

class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        // Ask permission for notifications
        let center = UNUserNotificationCenter.current()
        center.delegate = self
        center.requestAuthorization(options: [.alert, .badge, .sound]) { (granted, error) in
            if granted {
                print("Permission granted")
            } else {
                print("Permission denied\n")
            }
        }
    }
}

How Can I Repeat Local Notifications for Evey Hours in Every Day?

let interval:TimeInterval = 60.0 // 1 minute = 60 seconds

let trigger = UNTimeIntervalNotificationTrigger(timeInterval: interval, repeats: true) 

Use UNTimeIntervalNotificationTrigger instead of UNCalendarNotificationTrigger because UNCalendarNotificationTrigger object is used when you want to schedule the delivery of a local notification at the specified date and time and UNTimeIntervalNotificationTrigger object is used when you want to schedule the delivery of a local notification after the specified number of seconds elapse.

https://developer.apple.com/documentation/usernotifications/untimeintervalnotificationtrigger

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