Local or remote user notification

To use the local or remote user notification, first you need to add the reference to the UserNotifications framework.

   @import UserNotifications;

The most important is this code before using the user notification framework - you must get the user consent

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    

    UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];

    center.delegate = self;

    [center requestAuthorizationWithOptions:UNAuthorizationOptionAlert | UNAuthorizationOptionBadge | UNAuthorizationOptionSound

                         completionHandler:^(BOOL granted, NSError* err) {

                             if (granted) {

                                 NSLog(@"granted notif");

                             }

                             

                         }];

    

    return YES;

}

For the "center.delegate = self" to work, you need to implement this protocol in the AppDelegate class:

    UNUserNotificationCenterDelegate

To schedule a local user notification, please use the following sample code which I found in the Internet:

- (IBAction)schedule_click:(id)sender {

    

    UNMutableNotificationContent *localNotification = [UNMutableNotificationContent new];

    localNotification.userInfo = [NSDictionary dictionaryWithObjectsAndKeys:@"User1",@"Username", nil];

    localNotification.badge = [NSNumber numberWithInt:1];

    

    localNotification.sound = [UNNotificationSound defaultSound];

    

    // load the pre-defined mp3

    //localNotification.sound = [UNNotificationSound soundNamed:@"my.mp3"];

    

    localNotification.categoryIdentifier = @"myReminder";

    localNotification.body = @"Reminder to test";

    

    NSDate *date = [[NSDate date] dateByAddingTimeInterval:60];

    

    NSCalendar *gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

    

    /*NSCalendarUnitDay – Will set the repeatInterval to daily */

    NSDateComponents *dateComponents = [gregorian components:NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitTimeZone fromDate:date];

    

    UNCalendarNotificationTrigger *datetrigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:dateComponents repeats:YES];

    UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:@"Some Unique Value"

                                                                          content:localNotification

                                                                          trigger:datetrigger];

    

    UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];

    [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {

        NSLog(@"added notif. Error= %@",error);

    }];

}