UITableview title bar with date for week? - ios

Question

How can I have the title of UITableview with date?
I know I can edit the title using:
self.title=#"meals for ..";
I want to add the date for one week. How can I do that?

Answer 1

You can get a date like this:
NSDate *theDateToday = [NSDate date];
And format it like this:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"EEE MMM dd"];
NSString *theDateAsAString = [dateFormatter stringFromDate:theDateToday];
Combine that with what you have like this:
self.title = [NSString stringWithFormat:#"meals for %#", theDateAsAString];
As for finding the days of the week, you could try adapting this answer.
- (NSString *)getWeekStartDateAsString:(NSDate *)date {
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorian components:NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:today];
int dayofweek = [[[NSCalendar currentCalendar] components:NSWeekdayCalendarUnit fromDate:today] weekday];// this will give you current day of week
[components setDay:([components day] - ((dayofweek) - 2))];// for beginning of the week.
NSDate *beginningOfWeek = [gregorian dateFromComponents:components];
NSDateFormatter *dateFormat_first = [[NSDateFormatter alloc] init];
[dateFormat_first setDateFormat:#"yyyy-MM-dd"];
dateString2Prev = [dateFormat stringFromDate:beginningOfWeek];
weekstartPrev = [[dateFormat_first dateFromString:dateString2Prev] retain];
return weekstartPrev;
}
- (NSString *)getWeekEndDateAsString:(NSDate *)date {
NSCalendar *gregorianEnd = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *componentsEnd = [gregorianEnd components:NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:today];
int Enddayofweek = [[[NSCalendar currentCalendar] components:NSWeekdayCalendarUnit fromDate:today] weekday];// this will give you current day of week
[componentsEnd setDay:([componentsEnd day]+(7-Enddayofweek)+1)];// for end day of the week
NSDate *EndOfWeek = [gregorianEnd dateFromComponents:componentsEnd];
NSDateFormatter *dateFormat_End = [[NSDateFormatter alloc] init];
[dateFormat_End setDateFormat:#"yyyy-MM-dd"];
dateEndPrev = [dateFormat stringFromDate:EndOfWeek];
weekEndPrev = [[dateFormat_End dateFromString:dateEndPrev] retain];
return weekEndPrev;
}
You end result might look like this:
self.title = [NSString stringWithFormat:#"meals for %#-%#", [self getWeekStartDateAsString:theDateToday], [self getWeekEndDateAsString:theDateToday]];

Answer 2

A rarely known NSCalendar method will be the best option IMO
rangeOfUnit:startDate:interval:forDate:. It gives you the start and the duration (interval) for a certain time unit. With it it is easy to find the start of the week in the used calendar and add the range-1 to get the latest second in that week.
With the also rarely seen localizedStringFromDate:dateStyle:timeStyle: Available in OS X v10.6, iOS 4.0 it is easy to create a localized representation of the dates.
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *now = [NSDate date];
NSDate *startOfTheWeek;
NSDate *endOfWeek;
NSTimeInterval interval;
[cal rangeOfUnit:NSWeekCalendarUnit
startDate:&startOfTheWeek
interval:&interval
forDate:now];
//startOfWeek is 2013-06-02 22:00:00 +0000 now (note: it is GMT with timezone support for my timezone Europe/Berlin/DST)
endOfWeek = [startOfTheWeek dateByAddingTimeInterval:interval-1];
// 2013-06-09 21:59:59 +0000
NSString *text = [NSDateFormatter localizedStringFromDate:startOfTheWeek
dateStyle:NSDateFormatterShortStyle
timeStyle:NSDateFormatterNoStyle];
text = [text stringByAppendingString:#" to "];
text = [text stringByAppendingFormat:#"%#", [NSDateFormatter localizedStringFromDate:endOfWeek
dateStyle:NSDateFormatterShortStyle
timeStyle:NSDateFormatterNoStyle]];
self.title=text;
results in 03.06.13 to 09.06.13 for my german locale, where Monday is start of the week.