SwiftUI Local Notification Delegate [duplicate] - swift

Question

My problem is that I am trying to schedule notifications that come daily at a specific time this is my code
import SwiftUI
struct notifView: View {
var body: some View {
VStack {
VStack {
Button("Request Permission") {
let center = UNUserNotificationCenter.current()
center.requestAuthorization(options: [.alert, .badge, .sound]) { (granted, error) in
if granted {
print("Access Granted!")
} else {
print("Access Not Granted")
}
}
}
.frame(width: 200, height: 60, alignment: .center)
.foregroundColor(.black)
.background(Color.blue)
.cornerRadius(10.0)
.padding()
Button("Add Notifications For Morning") {
func scheduleNotification() {
let center = UNUserNotificationCenter.current()
let content = UNMutableNotificationContent()
content.title = "Morning Time"
content.body = "Wake Up And Be Productive!"
content.categoryIdentifier = "reminder"
content.sound = UNNotificationSound.default
var dateComponents = DateComponents()
dateComponents.hour = 6
dateComponents.minute = 30
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
center.add(request)
}
}
.padding()
Button("Add Notifications For Middle Of The Day") {
func scheduleNotification() {
let center = UNUserNotificationCenter.current()
let content = UNMutableNotificationContent()
content.title = "Middle Of The Day"
content.body = "Did you have your daily run?"
content.categoryIdentifier = "reminder"
content.sound = UNNotificationSound.default
var dateComponents = DateComponents()
dateComponents.hour = 12
dateComponents.minute = 30
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
center.add(request)
}
}
.padding()
Button("Add Notifications For Night") {
func scheduleNotification() {
let center = UNUserNotificationCenter.current()
let content = UNMutableNotificationContent()
content.title = "Night Time"
content.body = "Time to sleep"
content.categoryIdentifier = "reminder"
content.sound = UNNotificationSound.default
var dateComponents = DateComponents()
dateComponents.hour = 20
dateComponents.minute = 51
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
center.add(request)
}
}
.foregroundColor(.blue)
.padding()
}
}
}
}
struct notifView_Previews: PreviewProvider {
static var previews: some View {
notifView()
}
}

Answer 1

Look at the comments within the code
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 line of code 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 Notifications For Morning") {
//Unique date components
var dateComponents = DateComponents()
dateComponents.hour = 6
dateComponents.minute = 30
//Reusable method
self.notificationManager.scheduleTriggerNotification(title: "Morning Time", body: "Wake Up And Be Productive!", categoryIdentifier: "reminder", dateComponents: dateComponents, repeats: true)
}
.padding()
Button("Add Notifications For Middle Of The Day") {
var dateComponents = DateComponents()
dateComponents.hour = 12
dateComponents.minute = 30
//Reusable method
self.notificationManager.scheduleTriggerNotification(title: "Middle Of The Day", body: "Did you have your daily run?", categoryIdentifier: "reminder", dateComponents: dateComponents, repeats: true)
}
.padding()
Button("Add Notifications For Night") {
var dateComponents = DateComponents()
dateComponents.hour = 20
dateComponents.minute = 51
//Reusable method
self.notificationManager.scheduleTriggerNotification(title: "Night Time", body: "Time to sleep", categoryIdentifier: "reminder", dateComponents: dateComponents, repeats: true)
}
.foregroundColor(.blue)
.padding()
Button("Print Notifications") {
//Reusable method
self.notificationManager.printNotifications()
}
.foregroundColor(.blue)
.padding()
Button("Delete Notifications") {
//Reusable method
self.notificationManager.deleteNotifications()
}
.foregroundColor(.blue)
.padding()
}
}
}
}
//You need a central location for the notification code because
// it is needed in more than 1 spot. At launch in the AppDelegate
// and wherever you schedule your notifications
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 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()
}
///This is just a reusable form of all the copy and paste you did in your buttons. If you have to copy and paste make it reusable.
func scheduleTriggerNotification(title: String, body: String, categoryIdentifier: String, dateComponents : DateComponents, repeats: Bool) {
print(#function)
let content = UNMutableNotificationContent()
content.title = title
content.body = body
content.categoryIdentifier = categoryIdentifier
content.sound = UNNotificationSound.default
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: repeats)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
notificationCenter.add(request)
}
///Prints to console schduled notifications
func printNotifications(){
print(#function)
notificationCenter.getPendingNotificationRequests { request in
for req in request{
if req.trigger is UNCalendarNotificationTrigger{
print((req.trigger as! UNCalendarNotificationTrigger).nextTriggerDate()?.description ?? "invalid next trigger date")
}
}
}
}
//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()
}
}

Answer 2

I got it working with the help of this video:
https://www.youtube.com/watch?v=mG9BVAs8AIo
and some code from #lorem ipsum thank you so much for the help
import SwiftUI
import UserNotifications
struct notifView: View {
var body: some View {
VStack {
Button("Request Permission") {
NotificationManager.instance.requestAuthorization()
}
.padding()
.background(Color.green)
.cornerRadius(10)
Button("1st Notification") {
var dateComponents = DateComponents()
dateComponents.hour = 4
dateComponents.minute = 01
// reusable code thanks to lorem ipsum
NotificationManager.instance.scheduleTriggerNotification(title: "1st Notification", body: "1st Notification Body", categoryIdentifier: UUID().uuidString, dateComponents: dateComponents, repeats: true)
}
.padding()
.background(Color.yellow)
.cornerRadius(10)
Button("2nd Notification") {
var dateComponents = DateComponents()
dateComponents.hour = 5
dateComponents.minute = 40
// reusable code thanks to lorem ipsum
NotificationManager.instance.scheduleTriggerNotification(title: "2nd Notification", body: "2nd Notification Body", categoryIdentifier: UUID().uuidString, dateComponents: dateComponents, repeats: true)
}
.padding()
.background(Color.yellow)
.cornerRadius(10)
Button("3rd Notification") {
var dateComponents = DateComponents()
dateComponents.hour = 12
dateComponents.minute = 10
// reusable code thanks to lorem ipsum
NotificationManager.instance.scheduleTriggerNotification(title: "3rd Notification", body: "3rd Notification Body", categoryIdentifier: UUID().uuidString, dateComponents: dateComponents, repeats: true)
}
.padding()
.background(Color.yellow)
.cornerRadius(10)
}
}
}
class NotificationManager {
static let instance = NotificationManager()
func requestAuthorization() {
let options: UNAuthorizationOptions = [.alert, .badge, .sound]
UNUserNotificationCenter.current().requestAuthorization(options: options) { (success, error) in
if let error = error {
print("ERROR: \(error)")
} else {
print("SUCCESS")
}
}
}
// reusable code thanks to lorem ipsum
func scheduleTriggerNotification(title: String, body: String, categoryIdentifier: String, dateComponents : DateComponents, repeats: Bool) {
print(#function)
let content = UNMutableNotificationContent()
content.title = title
content.body = body
content.categoryIdentifier = categoryIdentifier
content.sound = UNNotificationSound.default
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: repeats)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request)
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
notifView()
}
}

Answer 3

Add one day in today's date so we got next day and then add your specific time on which you want trigger the notification.
var triggerComponents = DateComponents()
let nextDay = Calendar.current.date(byAdding: .day, value: 1, to: Date()) ?? Date()
triggerComponents = Calendar.current.dateComponents([.year, .month, .day, .hour], from: nextDay)
triggerComponents.hour = 14