Question

我需要这个, 才能在图表中获取每周的数据。这个对我不起作用。它返回的日期是所选年份的 1 1 月。任何 ideea 吗?

-(NSDate*) getFirstDateOfTheWeek:(NSString*) weekNr andYear: (NSString*) theYear {
        int intYear = [theYear intValue];
        int intWeek = [weekNr intValue];

        NSCalendar *gregorian = [[NSCalendar alloc]
                                 initWithCalendarIdentifier:NSGregorianCalendar];
        [gregorian setLocale:[NSLocale currentLocale]];

        NSDateComponents * comp = [[NSDateComponents alloc] init];
        [comp setYear:intYear];
        [comp setWeek:intWeek];

        NSDate *dateOfFirstDay = [gregorian dateFromComponents:comp];
        NSDateComponents *dateComponents =
        [gregorian components:NSWeekdayCalendarUnit|NSWeekCalendarUnit|NSDayCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit fromDate:dateOfFirstDay];
        int year = [dateComponents year];
        int month = [dateComponents month];
        int day = [dateComponents day];

        dateOfFirstDay= [gregorian dateFromComponents:dateComponents];
        return dateOfFirstDay;
    }

Answer 1

您应该将周六设在您的 NSDate Conconconvenents 上,再加上您设定年份和设置 Week 。

[comp setWeekday:intWeek];

当抓取新组件时, 您不需要许多旗帜, 因为您只需要一天( 和其他用于调试的) :

    [gregorian components:NSDayCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit fromDate:dateOfFirstDay];

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