You likely aren't requesting permission first
import SwiftUI
//struct and class should start with an uppercase
struct NotificationView: View {
//Central location for Notification code including the delegate
// A call to the notificationManager just like the one below has to be included in
// application(_:willFinishLaunchingWithOptions:) or
// application(_:didFinishLaunchingWithOptions:)
//https://developer.apple.com/documentation/usernotifications/unusernotificationcenterdelegate
//https://www.hackingwithswift.com/quick-start/swiftui/how-to-add-an-appdelegate-to-a-swiftui-app
let notificationManager: NotificationManager = NotificationManager.shared
var body: some View {
VStack {
VStack {
Button("Request Permission") {
//Call a func here don't define it
notificationManager.requestAuthorization()
}
.frame(width: 200, height: 60, alignment: .center)
.foregroundColor(.black)
.background(Color.blue)
.cornerRadius(10.0)
.padding()
Button("Add custom trigger") {
let apiDate = DateComponents(year: 2021, month: 11, day: 10, hour: 16, minute: 0, second: 0)
notificationManager.scheduleBasedOnDaysBeforeDate(title: "test", body: "test", baseDate: Calendar.current.date(from: apiDate)!, xDaysBefore: 10, count: 12, identifier: UUID().uuidString)
}
.padding()
Button("Print Notifications") {
//Reusable method
self.notificationManager.printNotifications()
}
Button("Print Delivered Notifications") {
//Reusable method
self.notificationManager.printDeliveredNotifications()
}
.foregroundColor(.blue)
.padding()
Button("Delete Notifications") {
//Reusable method
self.notificationManager.deleteNotifications()
}
.foregroundColor(.blue)
.padding()
}
}
}
}
class NotificationManager: NSObject, UNUserNotificationCenterDelegate{
//Singleton is requierd because of delegate
static let shared: NotificationManager = NotificationManager()
let notificationCenter = UNUserNotificationCenter.current()
private override init(){
super.init()
//This assigns the delegate
notificationCenter.delegate = self
}
func scheduleUNCalendarNotificationTrigger(title: String, body: String, dateComponents: DateComponents, identifier: String, repeats: Bool = false){
print(#function)
let content = UNMutableNotificationContent()
content.title = title
content.body = body
content.sound = .default
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: repeats)
let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
notificationCenter.add(request) { (error) in
if error != nil {
print(error!)
}
}
}
func scheduleUNTimeIntervalNotificationTrigger(title: String, body: String, timeInterval: TimeInterval, identifier: String, repeats: Bool = false){
print(#function)
let content = UNMutableNotificationContent()
content.title = title
content.body = body
content.sound = .default
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: timeInterval, repeats: repeats)
let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
notificationCenter.add(request) { (error) in
if error != nil {
print(error!)
}
}
}
///Schedules `count` number of monthly notifications that occur `xDaysBefore` the `baseDate`
func scheduleBasedOnDaysBeforeDate(title: String, body: String, baseDate: Date, xDaysBefore: Int, count: Int, identifier: String){
print(#function)
var nextBaseDate: Date = baseDate
for n in 1...count{
guard let triggerDate: Date = Calendar.current.date(byAdding: .day, value: -xDaysBefore, to: nextBaseDate) else{
return
}
let components: DateComponents = Calendar.current.dateComponents([.month,.day, .hour,.minute,.second], from: triggerDate)
let id = identifier.appending(" \(n)")
scheduleUNCalendarNotificationTrigger(title: title, body: body, dateComponents: components, identifier: id)
//OR if you want specific seconds
//let interval = Calendar.current.dateComponents([.second], from: Date(), to: triggerDate).second ?? 1
//scheduleUNTimeIntervalNotificationTrigger(title: title, body: body, timeInterval: TimeInterval(interval), identifier: id)
let next = Calendar.current.date(byAdding: .month, value: 1, to: nextBaseDate)
if next != nil{
nextBaseDate = next!
}else{
print("next == nil")
return
}
}
self.printNotifications()
}
func requestAuthorization() {
print(#function)
notificationCenter.requestAuthorization(options: [.alert, .badge, .sound]) { (granted, error) in
if granted {
print("Access Granted!")
} else {
print("Access Not Granted")
}
}
}
func deleteNotifications(){
print(#function)
notificationCenter.removeAllPendingNotificationRequests()
}
///Prints to console schduled notifications
func printNotifications(){
print(#function)
notificationCenter.getPendingNotificationRequests { request in
print("UNTimeIntervalNotificationTrigger Pending Notification")
for req in request{
if req.trigger is UNTimeIntervalNotificationTrigger{
print((req.trigger as! UNTimeIntervalNotificationTrigger).nextTriggerDate()?.description ?? "invalid next trigger date")
}
}
print("UNCalendarNotificationTrigger Pending Notification")
for req in request{
if req.trigger is UNCalendarNotificationTrigger{
print((req.trigger as! UNCalendarNotificationTrigger).nextTriggerDate()?.description ?? "invalid next trigger date")
}
}
}
}
///Prints to console delivered notifications
func printDeliveredNotifications(){
print(#function)
notificationCenter.getDeliveredNotifications { request in
for req in request{
print(req)
}
}
}
//MARK: UNUserNotificationCenterDelegate
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler(.banner)
}
}
struct NotificationView_Previews: PreviewProvider {
static var previews: some View {
NotificationView()
}
}
Run this code. Click on "Request Permission" first then click on "Add custom trigger" you should see your notification in the console when you click on "print"
