Local notification date

[fast]

hi,
I am creating an app that uses the local notification.
I am to see if they worked, I used a datapicker, but I would make sure that the date is decided by the code and not through the datapicker, so delete it.
here is my code right now:

	Class cls = NSClassFromString(@"UILocalNotification");
	if (cls != nil) {
		
		UILocalNotification *notif = [[cls alloc] init];
        
        notif.fireDate = [datePicker date];
		notif.timeZone = [NSTimeZone defaultTimeZone];
		notif.alertBody = @"Nuove previsioni Meteomar disponibili ora!";
		notif.soundName = @"harp.caf";
		//notif.applicationIconBadgeNumber = 1;
        notif.repeatInterval = NSDayCalendarUnit;	
		
		[[UIApplication sharedApplication] scheduleLocalNotification:notif];
		[notif release];
	}

Can you help me with the code?

[Domele]

So what's the problem? If it doesn't fire, NSLog the date picker's date to see if it correct:

NSLog(@"The date from the UIDatePicker is:%@", [datePicker.date description]);

[fast]

No, you do not understand. I would delete the datapicker and manage the time of the notification code, I tried replacing it with this code, but should not be:

notif.fireDate = [06:00:00 date];

[Duncan C]

Originally Posted by fast

No, you do not understand. I would delete the datapicker and manage the time of the notification code, I tried replacing it with this code, but should not be:

notif.fireDate = [06:00:00 date];

Of course that doesn't work. It's not legal code.

If you want to create a date from a constant value in your code, convert the date to a double with code like this

NSDate* pickerDate; 

//Get the date from your picker.
NSLog(@"Picker date in seconds is %d", 
 (int) [pickerDate timeIntervalSinceReferenceDate]);

Write down that value, and then add this code to your program:

	
	
notif.fireDate = 
  [NSDate dateWithTimeIntervalSinceReferenceDate: xxx];
[/quote]

Where "xxx" is the number you get in the log statement above.

[fast]

and if i write:

notif.fireDate = [NSDate dateWithTimeIntervalSinceReferenceDate:18];

[Duncan C]

Originally Posted by fast

and if i write:

notif.fireDate = [NSDate dateWithTimeIntervalSinceReferenceDate:18];

Where did you get the number 18?

The method dateWithTimeIntervalSinceReferenceDate takes as input a number of seconds since midnight January 1, 2001. So that call woudl give you a date of 00:00:18 on January 1, 2001.

Somehow, I doubt if that's what you want.

[fast]

I would for example set the alert to appear tomorrow night at 7PM.
how do I do?

NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *dateComps = [[NSDateComponents alloc] init];
    
    [dateComps setYear:2011];
    [dateComps setMonth:9];
    [dateComps setDay:22];
    
    [dateComps setHour:19];
    [dateComps setMinute:00];
    [dateComps setSecond:00];
    
    notif.fireDate = [calendar dateFromComponents:dateComps];
    notif.timeZone = [calendar timeZone];

[Duncan C]

Originally Posted by fast

I would for example set the alert to appear tomorrow night at 7PM.
how do I do?

NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *dateComps = [[NSDateComponents alloc] init];
    
    [dateComps setYear:2011];
    [dateComps setMonth:9];
    [dateComps setDay:22];
    
    [dateComps setHour:19];
    [dateComps setMinute:00];
    [dateComps setSecond:00];
    
    notif.fireDate = [calendar dateFromComponents:dateComps];
    notif.timeZone = [calendar timeZone];

The code you posted should work perfectly.

[Domele]

First get the current date using

NSDate *now = [NSDate date];

Then get the hour using NSCalendar's componentsFromDate method:

NSDate *now = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *currentHour = [calendar components:NSHourCalendarUnit fromDate:now];

Then find the difference between the hour and 7 pm

NSDate *now = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *currentHour = [calendar components:NSHourCalendarUnit fromDate:now];
int hour = [currentHour hour];
int offset = 19 - hour;

Then add a day and the offset using NSCalendar's dateByAddingComponents method:

NSDate *now = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *currentHour = [calendar components:NSHourCalendarUnit fromDate:now];
int hour = [currentHour hour];
int offset = 19 - hour;

NSDateComponents *timeToAdd = [NSDateComponents alloc] init];
[timeToAdd setDay: 1];
[timeToAdd setHour: offset];
NSDate *fireDate = [calendar dateByAddingComponents:timeToAdd toDate:now options:0];

[Duncan C]

Originally Posted by Domele

First get the current date using

NSDate *now = [NSDate date];

Then get the hour using NSCalendar's componentsFromDate method:

NSDate *now = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *currentHour = [calendar components:NSHourCalendarUnit fromDate:now];

Then find the difference between the hour and 7 pm

NSDate *now = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *currentHour = [calendar components:NSHourCalendarUnit fromDate:now];
int hour = [currentHour hour];
int offset = 19 - hour;

Then add a day and the offset using NSCalendar's dateByAddingComponents method:

NSDate *now = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *currentHour = [calendar components:NSHourCalendarUnit fromDate:now];
int hour = [currentHour hour];
int offset = 19 - hour;

NSDateComponents *timeToAdd = [NSDateComponents alloc] init];
[timeToAdd setDay: 1];
[timeToAdd setHour: offset];
NSDate *fireDate = [calendar dateByAddingComponents:timeToAdd toDate:now options:0];

Will that work if the current hour is before or after 19:00? I'm too tired to think it through completely.

[Domele]

Yes for example if it's 13:00, then the offset will be 6 hours. It'll had one day and 6 hours. If it's 21:00, then it'll add 22 hours (1 day - 2 hours).