iphone - 获取一周的第一天和最后一天

Question

我正在使用这种方法来获取当前星期的第一天和最后几天:

NSDate *weekDate = [NSDate date];
NSCalendar *myCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

NSDateComponents *currentComps = [myCalendar components:( NSYearCalendarUnit | NSMonthCalendarUnit | NSWeekOfYearCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit) fromDate:weekDate];
int ff = currentComps.weekOfYear;
NSLog(@"1  %d", ff);

[currentComps setWeekday:1]; // 1: sunday
NSDate *firstDayOfTheWeek = [myCalendar dateFromComponents:currentComps];
[currentComps setWeekday:7]; // 7: saturday
NSDate *lastDayOfTheWeek = [myCalendar dateFromComponents:currentComps];

NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];
myDateFormatter.dateFormat = @"dd/MM/yyyy";
NSString *firstStr = [myDateFormatter stringFromDate:firstDayOfTheWeek];
NSString *secondStr = [myDateFormatter stringFromDate:lastDayOfTheWeek];

NSLog(@"first - %@ \nlast - %@", firstStr, secondStr);

我想知道我应该在此方面进行哪些更改，以便从下个星期的第一天，最后一天到现在的两周？

Answer 1

要获得下周的服务，请在firstDayOfTheWeek中添加7天，然后在lastDayOfTheWeek中添加7天。

NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setDay:7];
NSDate *firstDayOfNextWeek = [myCalendar dateByAddingComponents:comps toDate:firstDayOfTheWeek options:0];

该代码假定每周工作7天。理想情况下，您将用获得实际一周时间的代码替换此假设。

旁注:您的代码假定星期从星期日开始。许多语言环境在其他日期(例如星期一)开始工作。更改:

[currentComps setWeekday:1];

至:

[currentComps setWeekday:[myCalendar firstWeekday]];

然后，我将更改 lastDayOfTheWeek的计算，以将 firstDayOfWeek添加6天。