I want to fire a UILocalNotification every day at 6:00, 9:00, 12:00 for the next 20 days.
I realize that this question is a very basic question, I would try to accomplish this with NSDateComponents, but then I realized that I could get problems when a month just has 28 days or the year changes. Thats why I ask: Has someone experience with such a task and could give me some hints?
Create three different local notification with repeatInterval.
UILocalNotification* localNotification = [[UILocalNotification alloc] init];
localNotification.fireDate = date; // Specifly date and time for notification
localNotification.repeatInterval = NSCalendarUnitDay;
localNotification.alertBody = #"Notification";
localNotification.timeZone = [NSTimeZone defaultTimeZone];
[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
At time of 20 days cancel those notification.
[[UIApplication sharedApplication] cancelAllLocalNotifications];
or
[[UIApplication sharedApplication] cancelLocalNotification:NOTIFICATION_ID];
Related
I am trying to create a date for next Sunday, and make it repeat for every Sunday after.
I know how to create the date using components, and components setWeek is depreciated, so I don't know how to do it now.
if You got the First Sunday Then You Should Do this To repeat it after seven Days!
NSString *sunday = #"Here Your Sunday Date";
NSDate *dateSunday = [self dateFromString:sunday];
[self GetNextSunday:dateSunday];
Then Call This Method To Get Next Sunday
-(void)GetNextSunday:(NSDate*)date
{
NSDate *NextSunday = [[NSDate alloc]init];
NSCalendar *gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorian components:( NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay) fromDate:date];
components.day = components.day + 8;
NextSunday = [gregorian dateFromComponents:components];
NSLog(#"%#",NextSunday);
}
This Will Return Next 7th Day ! I hope this Will Help You.
for Any Query Comment Below!
I want to get the last weekday of a given month.
I've come across this simple answer on how to get the 1st/2nd/... weekday which works well.
The question is: How to get the last weekday of a given month?
Not every month has only 4 Sundays, so do I have to count the number of Sundays of the month, or is there a more elegant way to do this?
Had the same need recently, and the best I could come up with is the following, which is meant to be run every day to check if the current day is the last weekday of the current month:
<?php
$d = new DateObject('first day of this month', date_default_timezone());
$d->modify("+15 days");
$d->modify("first day of next month -1 weekday");
$last = date_format($d, 'd');
$today = new DateObject('today', date_default_timezone());
$today = date_format($today, 'd');
if ($today == $last) {
//bingo
}
?>
I have been testing and so far couldn't find an example where this fails. The reason for doing the modify("+15 days") in the middle is to be sure we are calling "next month" with a starting date that is not in the edge between two months, case where I believe this could fail.
Leaving the code shown before apparently covers all cases.
I finally came up with the following solution. I'm using NSDate-Extensions for convenience. dayOfWeek stands for Sunday (1) till Saturday (7) in the Gregorian calendar:
- (NSDate *)dateOfLastDayOfWeek:(NSInteger)dayOfWeek afterDate:(NSDate *)date
{
// Determine the date one month after the given date
date = [date dateByAddingMonths:1];
// Set the first day of this month
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
dateComponents.year = date.year;
dateComponents.month = date.month;
dateComponents.day = 1;
// Get the date and then the weekday of this first day of the month
NSDate *tempDate = [[NSCalendar currentCalendar] dateFromComponents:dateComponents];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *firstDayComponents = [gregorian components:NSWeekdayCalendarUnit fromDate:tempDate];
NSInteger weekday = firstDayComponents.weekday;
// Determine how many days we have to go back to the desired weekday
NSInteger daysBeforeThe1stOfNextMonth = (weekday + 7) - dayOfWeek;
if (daysBeforeThe1stOfNextMonth > 7)
{
daysBeforeThe1stOfNextMonth -= 7;
}
NSDate *dateOfLastDayOfWeek = [tempDate dateBySubtractingDays:daysBeforeThe1stOfNextMonth];
return dateOfLastDayOfWeek;
}
I would like to be able to have a NSDate created when a button is pressed. Then, when the app enters sleep mode, and the user returns after a random amount of time, I compare the current time to the NSDate saved to find how much time to add to a NSTimer. So far, I have a created a NSDate in my button pressed method:
NSDate *test = [NSDate date];
I need help figuring out how to calculate the time since the NSDate in minutes and then put that info in a int. Any thoughts?
// before sleeping
NSDate *startTime = [NSDate date];
// when waking up
NSTimeInterval elapsed = [[NSDate date] timeIntervalSinceDate:startTime];
I am using NSDateFormatter to convert a series of dates to a week number within a month.
The date formatting code I am using is yyyyMMW and everything I have read tells me that W will be between 1-5.
But, the 2nd of June 2013 fell on a Sunday (the default start day of the week in the gregorian calendar) and it's week number is reported as 0 even though the start date of the week is calculated correctly:
2013-06-03 14:15:45.611 date=20130531, week=2013055, start of week=20130526
2013-06-03 14:15:45.612 date=20130602, week=2013060, start of week=20130602
2013-06-03 14:15:45.612 date=20130603, week=2013061, start of week=20130602
Some quick and dirty test code to reproduce the log shown above:
NSDateFormatter *dateFormatDaily = [[NSDateFormatter alloc] init];
[dateFormatDaily setDateFormat:#"yyyyMMdd"];
NSDateFormatter *dateFormatterWeekly = [[NSDateFormatter alloc] init];
[dateFormatterWeekly setDateFormat:#"yyyyMMW"];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
[calendar setFirstWeekday:1]; // default but set here for clarity
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
[dateComponents setMonth:5];
[dateComponents setDay:31];
[dateComponents setYear:2013];
NSDate *date_1 = [calendar dateFromComponents:dateComponents];
[dateComponents setMonth:6];
[dateComponents setDay:2];
NSDate *date_2 = [calendar dateFromComponents:dateComponents];
[dateComponents setDay:3];
NSDate *date_3 = [calendar dateFromComponents:dateComponents];
NSArray *datesToTest = #[date_1, date_2, date_3];
for (NSDate *date in datesToTest) {
NSString *weekNo = [dateFormatterWeekly stringFromDate:date];
NSDate *beginningOfWeek = nil;
BOOL rc = [calendar rangeOfUnit:NSWeekCalendarUnit startDate:&beginningOfWeek interval:NULL forDate:date];
if (rc) {
NSLog(#"date=%#, week=%#, start of week=%#", [dateFormatDaily stringFromDate:date], weekNo, [dateFormatDaily stringFromDate:beginningOfWeek]);
} else {
NSLog(#"Could not calculate beginning of week");
}
}
Any ideas? A week number of 0 under any circumstances seems wrong to me.
Thanks
There are various parameters that cause this effect. First of all, you did not set a calendar for the date formatter. If you add
[dateFormatterWeekly setCalendar:calendar];
to your code, then the output will be as you expected:
date=20130531, week=2013055, start of week=20130526
date=20130602, week=2013062, start of week=20130602
date=20130603, week=2013062, start of week=20130602
But in your case, the date formatter uses the current calendar, and therefore has separate parameters firstWeekDay and minimumDaysInFirstWeek. These parameters are locale dependent. If I test this on the iOS Simulator with the "Region Format" set to "German -> Germany", then
[[dateFormatterWeekly calendar] firstWeekday] = 2
[[dateFormatterWeekly calendar] minimumDaysInFirstWeek] = 4
and I assume that you will have similar values, because now I get the same output as you.
Now for the date formatter, the week starts on a Monday, which means that June 2 is in the week starting at May 27. This counts as "week #0" in June, because only one day of this week is in June, but minimumDaysInFirstWeek = 4. The first week in a month that has at least
minimumDaysInFirstWeek days, counts as "week #1".
(I found the relevance of the minimumDaysInFirstWeek parameter here:
http://www.cocoabuilder.com/archive/cocoa/326845-week-of-month-confusion.html)
NSDateFormatterFullStyle api is giving different date formats in iPod and iPhone. In
iPhone : Friday, 21 December 2012 (coma is missed)
iPod : Friday, 21 December, 2012.
Sample code:
NSDate *date = [NSDate dateWithTimeIntervalSince1970:[postdateText doubleValue] / 1000.0];
NSLog(#"date %#:",date);
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale:[NSLocale currentLocale]];
NSString *dateString = [NSDateFormatter localizedStringFromDate:date dateStyle:NSDateFormatterFullStyle timeStyle:NSDateFormatterNoStyle];
NSTimeZone *tz = [NSTimeZone timeZoneWithName:#"CST"];
[dateFormatter setTimeZone:tz];
return dateString;
// I was tried in this way as well
//[dateFormatter setDateFormat:#"EEEE, MMMM dd, YYYY"];
//[dateFormatter setDateStyle:NSDateFormatterFullStyle];
That is changing depends on region format as well as language. Go to settings->General->International->Region Format. It should work.