Question

我需要创建一个日历，用户可以在几周内滚动。一周的第一天和最后一天将显示为（例如）“6月4日 - 6月10日”。

现在我从一开始就知道我需要NSDate和NSCalendar，而且我确实得到了本周的第一天和最后一天，但它看起来非常麻烦而且我是确定需要一种更简单的方法，因为我需要获得更多未来几周的日期。这是我的代码，它给出了当周第一天和最后一天的day和month：

    NSDate *today = [NSDate date];
    NSCalendar* cal = [NSCalendar currentCalendar];
    NSDateComponents* comp = [cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSYearCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit) fromDate:[NSDate date]];

    NSDate *beginOfWeek = [today dateByAddingTimeInterval: -1*([comp weekday]-2)*24*3600];
    NSDate *endOfWeek = [today dateByAddingTimeInterval:(7-[comp weekday]+2)*24*3600];

    NSLog(@"beginWeekDay=%d\n",[[cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSDayCalendarUnit) fromDate: beginOfWeek] day]);
    NSLog(@"endWeekDay=%d\n",[[cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSDayCalendarUnit) fromDate: endOfWeek] day]);
    NSLog(@"beginWeekmonth=%d\n",[[cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSDayCalendarUnit) fromDate: beginOfWeek] month]);
    NSLog(@"endWeekmonth=%d\n",[[cal components:(NSWeekdayCalendarUnit|NSMonthCalendarUnit|NSWeekCalendarUnit|NSDayCalendarUnit) fromDate: endOfWeek] month]);

Answer 1

我找到了这个，这可能对您有所帮助：http://www.cocoanetics.com/2009/11/add-one-week-skip-weekend/

- (NSDate *)addWeekToDateAndSkipWeekend:(NSDate *)now {
int daysToAdd = 6; // we'll add the 7th later

// set up date components
NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease];
[components setDay:daysToAdd];

// create a calendar
NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];

NSDate *newDate = [gregorian dateByAddingComponents:components toDate:now options:0];

[components setDay:1]; // reuse to skip single days
NSDateComponents *newDateComps; // new componets to get weekday

// do always executed once, so we add the 7th day here
do
{
    // add one day
    newDate = [gregorian dateByAddingComponents:components toDate:newDate options:0];
    newDateComps = [gregorian components:NSWeekdayCalendarUnit fromDate:newDate];

    // repeat if the date is Saturday (7) or Sunday (1)
    NSLog(@"weekday: %d", [newDateComps weekday]);
} while (([newDateComps weekday]==7)||([newDateComps weekday]==1));

return newDate;
}

理论上，你在[NSDate date]的for循环中运行它，你将返回7th天，然后你将通过这个运行返回的7th天并获得下一个..等。

如果您不需要，可能需要进行细微更改，以取消周六+周日的支票。

希望这有帮助！

获得一周的第一天和最后一天

1 个答案: