Add Local Notification in iOS 10 - Swift 3

Question

So I been trying to add a notification to the new UNUserNotificationCenter, but I don't seem to get it.

My view controller has an action:

@IBAction func sendPressed(_ sender: AnyObject) {
    let content = UNMutableNotificationContent()

    content.title = "Hello"
    content.body = "What up?"
    content.sound = UNNotificationSound.default()

    // Deliver the notification in five seconds.
    let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 5, repeats: false)
    let request = UNNotificationRequest.init(identifier: "FiveSecond", content: content, trigger: trigger)

    // Schedule the notification.
    let center = UNUserNotificationCenter.current()
    center.add(request) { (error) in
        print(error)
    }
    print("should have been added")
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    let center = UNUserNotificationCenter.current()
    center.requestAuthorization([.alert, .sound]) { (granted, error) in
    }
}

And I have a Notification Content Extension in the project as well, but it does not seem to be triggered at all, any ideas what I'm missing? I'm trying the example from the user documentation, but it's not telling me much more or I have missed it.

Here: https://developer.apple.com/reference/usernotifications/unmutablenotificationcontent

Also: https://developer.apple.com/reference/usernotificationsui https://developer.apple.com/reference/usernotifications

Edit:

So putting the app in the background did the trick.

Coracle

You can refer this link for detailed usage jayprakashdubey.blogspot.in/2016/07/… – Anticholinergic

how to set different date components or how to call local notfications multiple times? – Jasik

Answer 1

You need to register for Notification...I tried and this works.

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        let center = UNUserNotificationCenter.current()
        center.requestAuthorization([.alert, .sound]) { (granted, error) in
            // Enable or disable features based on authorization.
        }
        return true
    }

Edit: You dont need to put your app in background to present notification from iOS 10 onwards.

Use below callback to configure notification to present in foreground.

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)

Here is a sample project.

Wace

Yes I have this, still no luck. Do you have a full app example so I can see if I missed anything? – Coracle

@Coracle in ios10..we can display notification while the app is in foreground as of android...see the sample project.... – Selenite

hi @anish I downloaded the app and ran on simulator. I don't see a notification? – Heartwood

Ahh..demo project was in Xcode 8 beta...I have updated example for the Xcode 8... – Selenite

how to set different date components or how to call local notfications multiple times? – Jasik

Answer 2

With Objective-C implemation:

I have wrote a Demo project here: iOS10AdaptationTips .

1. import UserNotifications

   ///Notification become independent from Foundation
   @import UserNotifications;
   

2. request authorization for localNotification

   UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
   [center requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert)
                         completionHandler:^(BOOL granted, NSError * _Nullable error) {
                             if (!error) {
                                 NSLog(@"request authorization succeeded!");
                                 [self showAlert];
                             }
                         }];
   

   Request Authorization:

3. schedule localNotification

4. update application icon badge number

       //        //Deliver the notification at 08:30 everyday
       //        NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
       //        dateComponents.hour = 8;
       //        dateComponents.minute = 30;
       //        UNCalendarNotificationTrigger *trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:dateComponents repeats:YES];
   
       UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
       content.title = [NSString localizedUserNotificationStringForKey:@"Elon said:" arguments:nil];
       content.body = [NSString localizedUserNotificationStringForKey:@"Hello Tom！Get up, let's play with Jerry!"
                                                            arguments:nil];
       content.sound = [UNNotificationSound defaultSound];
   
       /// 4. update application icon badge number
       content.badge = @([[UIApplication sharedApplication] applicationIconBadgeNumber] + 1);
       // Deliver the notification in five seconds.
       UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger
                                                     triggerWithTimeInterval:5.f repeats:NO];
       UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:@"FiveSecond"
                                                                             content:content trigger:trigger];
       /// 3. schedule localNotification
       UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
       [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
           if (!error) {
               NSLog(@"add NotificationRequest succeeded!");
           }
       }];
   

then it will appear like this:

In Background : Lock Screen:

If Repeat by default only show one instead of show many on the lock screen on iOS9: and also support 3D Touch automatically

I write a Demo here: iOS10AdaptationTips .

Surfacetoair

Hi , I ran you demo but it gives me exception Assertion failure in -[UNTimeIntervalNotificationTrigger _initWithTimeInterval:repeats:] while executing UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:5.f repeats:YES];. – Oeo

Why are you writing in Objective-C? – Diffractometer

Because he can ;) – Cali

Local notifications are not firing....Pl check my post – Meanly

@EktaPadaliya Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'time interval must be at least 60 if repeating' – Surfacetoair

@ElonChan Hi Elon, I have added the local notification you mentioned here for iOS 10. I have also checked that from iOS 10 we can show notification in foreground as well but I am not able to successfully implement that. could you please help me with that ? – Stanhope

HI, i tried u r demo. but it is not showing any notifications. – Sophia

Answer 3

I solved my problem as follows (Firebase, Swift 3):

Find this method on your AppDelegate:

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

Find this line:

completionHandler()

End set:

completionHandler([.alert,.sound,.badge])

notifications are not firing if you not pass your presentation options to completionHandler method.

Kwang

Don't see the point of a huge framework to do something that simple. – Coracle

Apple's or Firebase's? – Eldon

This should really be used without a framework. It's very simple to do – Kowalczyk

Answer 4

Here are a few steps:

1. Make sure you have the permission. If not, use UNUserNotificationCenter.current().requestAuthorization to get that. Or follow the answer if you want to show the request pop up more than once.

2. If you want to show the notification foreground, having to assign UNUserNotificationCenterDelegate to somewhere.

3. Show me the code

   @IBAction func sendPressed(_ sender: AnyObject) {
       let content = UNMutableNotificationContent()
       content.title = "Hello"
       content.body = "What up?"
       content.sound = UNNotificationSound.default()
   
       let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 5, repeats: false)
       let request = UNNotificationRequest.init(identifier: "FiveSecond", content: content, trigger: trigger)
   
       let center = UNUserNotificationCenter.current()
       center.add(request) { (error) in
           print(error)
       }
   }
   
   override func viewDidLoad(_ animated: Bool) {
       super.viewDidLoad(animated)
   
       // Assign the delegate
       UNUserNotificationCenter.current().delegate = self
   
       // Ask the permission
       let center = UNUserNotificationCenter.current()
       center.requestAuthorization([.alert, .sound]) { (granted, error) in
           if granted {
               // do something
           }
       }
   }
   // Remember to add UNUserNotificationCenterDelegate to your view controller
   func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
       print("Got the msg...")
       completionHandler([.badge, .sound, .alert])
   }
   

Deejay

Cannot assign value of type 'MainScreen' to type 'UNUserNotificationCenterDelegate?', when using in view did load, UNUserNotificationCenter.current().delegate = self – Fite

You might want to add UNUserNotificationCenterDelegate to your screen (ViewController) – Deejay

Answer 5

I have made an implementation for Swift 3 which may help, you can check it here: https://mcmap.net/q/169615/-local-and-push-notifications-in-ios-version-compatible

Pray