// MARK: - 獲取本周的第一天和最后一天

• (NSArray *)getFirstAndLastDayOfThisWeek
  {
  NSString *beginDateStr;
  NSString *endDateStr;
  NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
  [dateFormatter setDateFormat:@"yyyy-MM-dd"];

  NSDate *date=[NSDate date];
  NSCalendar *calendar=[NSCalendar currentCalendar];
  [calendar setFirstWeekday:2];//設定周一為周首日
  NSDateComponents *comps=[calendar components:(NSCalendarUnitWeekday|NSCalendarUnitWeekdayOrdinal) fromDate:date];
  //NSInteger week=[comps week];//今年第幾周

  NSInteger weekday=[comps weekday];//注意 周日 是 “1”，周一是 “2”
  NSInteger theWeekDay=weekday-1;
  NSDate nowDate=[[NSDate alloc] init];
  if (theWeekDay==0) {//今天是星期天
  NSTimeInterval interval=2460606;//減6天
  NSDate *benginDate=[nowDate initWithTimeIntervalSinceNow:-interval];
  beginDateStr=[NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:benginDate]];
  endDateStr=[NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:date]];
  }else{

    NSTimeInterval benginInterval=-(theWeekDay-1)*24*60*60;//向前 減的毫秒數(shù)
    NSTimeInterval endInterval=+(7-theWeekDay)*24*60*60;//向后 加的毫秒數(shù)
    NSDate *beginDate=[nowDate initWithTimeIntervalSinceNow:benginInterval];
    NSDate *endDate=[nowDate initWithTimeIntervalSinceNow:endInterval];
    beginDateStr=[NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:beginDate]];
    endDateStr=[NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:endDate]];
  

  }

  return [NSArray arrayWithObjects:beginDateStr,endDateStr, nil];
  }