How to get the date of the weekends? - objective-c

Question

I would like to use the date of the weekends to use it in the NSLocalNotification, but i don't how to get it, i tried to do it mathematically, but sometimes i gets a number greater than the days of the month.

Answer 1

Note that iOS supports several Calendars, I am not sure, if all cultures that uses those calendars have a concept of weekends and if they are always meant to have two days.
Something you also needs to deal with: even in countries that uses the Gregorian calendar a week might start with monday or sunday.
But if we assume that a weekend are equivalent to saturday and sunday, this might be helpful for you:
NSDate *referenceDate = [NSDate date];
NSDate *startOfThisWeek;
NSDate *saturday;
NSUInteger backupStartWeekday = [[NSCalendar currentCalendar] firstWeekday];
[[NSCalendar currentCalendar] setFirstWeekday:1]; // ensure week begins at sunday
[[NSCalendar currentCalendar] rangeOfUnit:NSWeekCalendarUnit
startDate:&startOfThisWeek
interval:NULL
forDate:referenceDate];
NSDateComponents *components = [[NSDateComponents alloc] init];
components.day = [[NSCalendar currentCalendar] maximumRangeOfUnit:NSWeekdayCalendarUnit].length; //the start of the next week
components.day = components.day - 2;
saturday = [[NSCalendar currentCalendar] dateByAddingComponents:components
toDate:startOfThisWeek
options:0];
[[NSCalendar currentCalendar] setFirstWeekday:backupStartWeekday];

Answer 2

Your first problem about getting the date can be solved as :
NSCalendar *calender=[NSCalendar currentCalendar];
NSRange daysRange=[calender rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:[NSDate date]];
NSUInteger numberOfDaysInMonth=daysRange.length;
//NSLog(#"num of days in current month : %ld",numberOfDaysInMonth);
NSDateComponents *dateComponents = [calender components:NSWeekdayCalendarUnit fromDate:[NSDate date]];
NSInteger dayCount=[dateComponents weekday];
//if today itself is saturday what you want to display? today or upcoming one... then do small changes here, for sat & sun.
NSInteger daysForSaturday=7-dayCount;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"dd"];
NSUInteger todaysDate = [[formatter stringFromDate:[NSDate date]]integerValue];
// NSLog(#"Today is : %#",todaysDate);
NSUInteger comingSaturday=todaysDate+daysForSaturday;
if (comingSaturday>numberOfDaysInMonth) {
comingSaturday-=numberOfDaysInMonth;
}
NSUInteger comingSunday=comingSaturday+1;
NSLog(#"Coming.. Sat is : %ld, Sun in : %ld",comingSaturday, comingSunday);