Add Local Notification in iOS 10 - Swift 3

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 .

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.