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标题: 获取本周的周一和周日 [打印本页]

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作者: iOS小学生    时间: 2018-6-27 13:38
标题: 获取本周的周一和周日
-(void)test{
   
   
    NSDate *now = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *comp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday|NSCalendarUnitDay
                                         fromDate:now];
   
    // 得到星期几
    // 1(星期天) 2(星期二) 3(星期三) 4(星期四) 5(星期五) 6(星期六) 7(星期天)
    NSInteger weekDay = [comp weekday];
    // 得到几号
    NSInteger day = [comp day];
   
    NSLog(@"weekDay:%ld   day:%ld",weekDay,day);
   
    // 计算当前日期和这周的星期一和星期天差的天数
    long firstDiff,lastDiff;
    if (weekDay == 1) {
        firstDiff = 1;
        lastDiff = 0;
    }else{
        firstDiff = [calendar firstWeekday] - weekDay;
        lastDiff = 9 - weekDay;
    }
   
    NSLog(@"firstDiff:%ld   lastDiff:%ld",firstDiff,lastDiff);
   
    // 在当前日期(去掉了时分秒)基础上加上差的天数
    NSDateComponents *firstDayComp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
    [firstDayComp setDay:day + firstDiff];
    NSDate *firstDayOfWeek= [calendar dateFromComponents:firstDayComp];
   
    NSDateComponents *lastDayComp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
    [lastDayComp setDay:day + lastDiff];
    NSDate *lastDayOfWeek= [calendar dateFromComponents:lastDayComp];
   
    NSDateFormatter *formater = [[NSDateFormatter alloc] init];
    [formater setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSLog(@"星期一开始 %@",[formater stringFromDate:firstDayOfWeek]);
    NSLog(@"当前 %@",[formater stringFromDate:now]);
    NSLog(@"星期天结束 %@",[formater stringFromDate:lastDayOfWeek]);
}

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