Creo que esto responde a las discusiones lo que estás buscando: sin embargo, que no se ocupa de los lunes como el primer día de la semana http://www.cocoabuilder.com/archive/cocoa/211648-nsdatecomponents-question.html#211826
Nota , por lo que puede tener que modificarlo un poco restando [gregorian firstWeekday]
en lugar de solo 1
. Además, he modificado para utilizar -currentCalendar
, pero es hasta que :-)
NSDate *today = [NSDate date];
NSCalendar *gregorian = [NSCalendar currentCalendar];
// Get the weekday component of the current date
NSDateComponents *weekdayComponents = [gregorian components:NSWeekdayCalendarUnit fromDate:today];
/*
Create a date components to represent the number of days to subtract
from the current date.
The weekday value for Sunday in the Gregorian calendar is 1, so
subtract 1 from the number
of days to subtract from the date in question. (If today's Sunday,
subtract 0 days.)
*/
NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
/* Substract [gregorian firstWeekday] to handle first day of the week being something else than Sunday */
[componentsToSubtract setDay: - ([weekdayComponents weekday] - [gregorian firstWeekday])];
NSDate *beginningOfWeek = [gregorian dateByAddingComponents:componentsToSubtract toDate:today options:0];
/*
Optional step:
beginningOfWeek now has the same hour, minute, and second as the
original date (today).
To normalize to midnight, extract the year, month, and day components
and create a new date from those components.
*/
NSDateComponents *components = [gregorian components: (NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit)
fromDate: beginningOfWeek];
beginningOfWeek = [gregorian dateFromComponents: components];
su información, una respuesta fácil: http://stackoverflow.com/a/14688780/308315 – iwasrobbed