CODEWITHSUNDEEP
iosobjective-cuilocalnotification
Brittany
Brittany

Reputation: 1449

Obj-C - Fire local notifications at specific times?

I'm building a calendar app, and I want my users to be able to get notified 30 min before an appointment, or 60 minutes before an appointment. That said, how can I schedule a local notification to fire 30 min before a scheduled time pulled from an array or dictionary? My current code is able to fire a notification from the background at a specific time, but I'm not sure how to call the returned dates set by my user to App Delegate?

E.g. the array data coming from my server:

"Apr 14 2021 12:04 PM",
"Apr 17 2021 12:27 PM"

My code currently in app delegate:

AppDelegate.m

- (void)applicationDidEnterBackground:(UIApplication *)application {
    
    NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar] ;
       NSDate *now = [NSDate date];
       NSDateComponents *components = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth |  NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute) fromDate:now];
       [components setHour:7];
       [components setMinute:00];

       UILocalNotification *notification = [[UILocalNotification alloc]init];
       notification.fireDate = [calendar dateFromComponents:components];
       notification.repeatInterval = NSDayCalendarUnit;
       [notification setAlertBody:@"Ready to start your day?"];
       // notification.soundName = UILocalNotificationDefaultSoundName;
       [[UIApplication sharedApplication] scheduleLocalNotification:notification];
    
    
}

Any help on how I should execute this is appreciated! I hope the way I explained what I'm trying to do makes sense.

Upvotes: 0

Views: 319

Answers (1)

AntiVIRUZ
AntiVIRUZ

Reputation: 342

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"MMM d yyyy h:mm a";

NSString *dtString = @"Apr 14 2021 12:04 PM";
NSDate *date = [dateFormatter dateFromString:dtString];

NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar] ;
NSDateComponents *components = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth |  NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute) fromDate:date];
components.minute -= 30;
NSDate *fireDate = [calendar dateFromComponents:components];

Then use fireDate to set fireDate of notification. I suggest storing dateFormatter and calendar as static properties.

Upvotes: 1

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