Swift 3 - How to set up Local Notification at specific date - ios

Question

I need your help for a project.
I have 3 variables, one for the day , another for the month and last for the year. Like that :
var year = 2017
var month = 06
var day = 19
I want to send a notification even if the app is close when we are at the date of these variable, but i'm not really good with Calendar and Date. I just made this app for the moment.
let myNotification = Notification.Name(rawValue:"MyNotification")
override func viewDidLoad() {
super.viewDidLoad()
let nc = NotificationCenter.default
nc.addObserver(forName:myNotification, object:nil, queue:nil, using:catchNotification)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let nc = NotificationCenter.default
nc.post(name:myNotification,
object: nil,
userInfo:["message":"Hello there!", "date":Date()])
}
func catchNotification(notification:Notification) -> Void {
print("Catch notification")
guard let userInfo = notification.userInfo,
let message = userInfo["message"] as? String,
let date = userInfo["date"] as? Date else {
print("No userInfo found in notification")
return
}
let alert = UIAlertController(title: "Notification!",
message:"\(message) received at \(date)",
preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
Thank you in advance

Answer 1

You need to set up a local notification and use a UNCalendarNotificationTrigger to fire it at a specific date.
let dateComponents = DateComponents(year: year, month: month, day: day)
let yourFireDate = Calendar.current.date(from: dateComponents)
let content = UNMutableNotificationContent()
content.title = NSString.localizedUserNotificationString(forKey:
"Your notification title", arguments: nil)
content.body = NSString.localizedUserNotificationString(forKey: "Your notification body", arguments: nil)
content.categoryIdentifier = "Your notification category"
content.sound = UNNotificationSound.default()
content.badge = 1
let dateComponents = Calendar.current.dateComponents(Set(arrayLiteral: Calendar.Component.year, Calendar.Component.month, Calendar.Component.day), from: yourFireDate)
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: false)
let request = UNNotificationRequest(identifier: "Your notification identifier", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request, withCompletionHandler: { error in
if let error = error {
//handle error
} else {
//notification set up successfully
}
}

Answer 2

In swift 3 - 4 use this.
func scheduleLocal() {
let dateComponents = DateComponents(year: 2019, month: 1, day: 17, hour: 10, minute: 20)
let yourFireDate = Calendar.current.date(from: dateComponents)
let notification = UILocalNotification()
notification.fireDate = yourFireDate
notification.alertBody = "Hey you! Yeah you! Swipe to unlock!"
notification.alertAction = "be awesome!"
notification.soundName = UILocalNotificationDefaultSoundName
notification.userInfo = ["CustomField1": "w00t"]
UIApplication.shared.scheduleLocalNotification(notification)
}