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

Question

I have been looking all over for an answer on how to send notifications at a specific time of day. I need it to display a local notification to the user's device every weekday at 8:00 A.M. I am aware that this question has been answered before. I found a Stack Overflow question: Local Notifications at a specific time
Unfortunately, it was pretty outdated as most of the code was removed from Swift since iOS 11 was released. I needed a more recent answer. I am kind of new to Swift programming. If someone could help me out and give me a more recent answer, that would be amazing!

Answer 1

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")
}
}
}
}

Answer 2

Swift 5
This is an example of what I have used for scheduling local notifications using Notification Center.
import UserNotifications
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
//MARK: Authorization
let center = UNUserNotificationCenter.current()
//Delegate for UNUserNotificationCenterDelegate
center.delegate = self
//Permission for request alert, soud and badge
center.requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
// Enable or disable features based on authorization.
if(!granted){
print("not accept authorization")
}else{
print("accept authorization")
center.delegate = self
}
}
return true
}
}
send notification
let content = UNMutableNotificationContent()
content.title = NSString.localizedUserNotificationString(forKey: "We have a new message for you", arguments: nil)
content.body = NSString.localizedUserNotificationString(forKey: "Open the app for see", arguments: nil)
content.sound = UNNotificationSound.default
content.badge = 1
let identifier = id.uuidString
//Receive notification after 5 sec
//let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)
//Receive with date
var dateInfo = DateComponents()
dateInfo.day = day //Put your day
dateInfo.month = month //Put your month
dateInfo.year = year // Put your year
dateInfo.hour = 8 //Put your hour
dateInfo.minute = 0 //Put your minutes
//specify if repeats or no
let trigger = UNCalendarNotificationTrigger(dateMatching: dateInfo, repeats: true)
let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
let center = UNUserNotificationCenter.current()
print(identifier)
center.add(request) { (error) in
if let error = error {
print("Error \(error.localizedDescription)")
}else{
print("send!!")
}
}
remembering to read this in the documentation:
https://developer.apple.com/library/archive/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/index.html#//apple_ref/doc/uid/TP40008194-CH3-SW1