ios 年龄的时间换算

最新推荐文章于 2024-03-04 10:34:39 发布

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最新推荐文章于 2024-03-04 10:34:39 发布

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分类专栏： obj-应用文章标签：年龄换算 ios开发

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本文介绍了在iOS应用中如何进行年龄计算，通过将时间转换为数字（年份*10000+月份*100+日期），然后用当前时间减去出生日期来获取精确的年龄数据，确保客户端与服务器数据一致性。

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App中经常会用到用户的年岭（比如 3岁零5个月），一般都是服务器换算后返回，但是也不免会有客户端换算的情况，为了确保年龄的数据一致，在做之前和我们的服务器程序员做了一次沟通，效仿他的代码写了下面的换算。

-(NSString *)guideShowWithTime:(NSString *)time{
   
    //获取当前的 年 月 日
    NSString *subTime = [time substringToIndex:10];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = @"yyyy.MM.dd";
    NSDate *currentData = [formatter dateFromString:subTime];
    NSDateComponents *currentComponents =[[NSCalendar currentCalendar] components:NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:currentData];
    NSInteger currentDateYear = [currentComponents year];
    NSInteger currentDateMonth = [currentComponents month];
    NSInteger currentDateDay = [currentComponents day];
   
    //获取用户的 年 月 日
    NSDateFormatter *userFormatter = [[NSDateFormatter alloc] init];
    userFormatter.dateFormat = @"yyyy-MM-dd";
    User *user = [[UserManager sharedUserManager] user];
    NSDate *userDate = [userFormatter dateFromString:[user babyBirthday]];
    NSDateComponents *userComponents =[[NSCalendar currentCalendar] components:NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit fromDate:userDate];
    NSInteger userDateYear = [userComponents year];
    NSInteger userDateMonth = [userComponents month];
    NSInteger userDateDay = [userComponents day];
   
    NSMutableString *dateStr = [NSMutableString string];
    int currentNumb = currentDateYear *10000+currentDateMonth*100+currentDateDay;
    int userNumb = userDateYear*10000 + userDateMonth*100 +userDateDay;
    int ageNumb = currentNumb - userNumb;
    if (ageNumb<0) {//备孕
        int dist = userNumb - currentNumb;
        if (dist>280) {//备孕期
            [dateStr appendString:@"备孕期"];
        }else{//孕期
            int week  =(280-dist)/7;
            [dateStr appendFormat:@"孕期%d周",week];
//            self.guideValue = @"-10";
        }
    }
   
    int years = 0;
    int months = 0;
    int days = 0;
    if (ageNumb>=10000) {//有一岁
        years = ageNumb/10000;
    }
    ageNumb = ageNumb%10000;
    months = ageNumb/100;
    if (months>12) {
        months -=88;
    }
    days = ageNumb%100;
    //当月第一天
    NSString *firstStr = [NSString stringWithFormat:@"%d.%d.01",currentDateYear,currentDateMonth];
    NSDate *firstDay = [formatter dateFromString:firstStr];
    NSTimeInterval firstInterval = [firstDay timeIntervalSince1970];
    NSTimeInterval lastInterval =  firstInterval-24*3600;//上个月的最后一天
    NSDate *lastDay = [NSDate dateWithTimeIntervalSince1970:lastInterval];
    //上个月的天数
    NSRange range = [[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:lastDay];
    NSUInteger numberOfDaysInMonth = range.length;
    if (days>currentNumb%100) {
        days = days-(100-numberOfDaysInMonth);
    }
   
    if (years>0) {
        [dateStr appendFormat:@"%d岁",years];
    }
    if (months>0) {
        [dateStr appendFormat:@"%d月",months];
    }
    if (days>0) {
        [dateStr appendFormat:@"%d天",days];
    }
//    self.age = dateStr;
    return dateStr;
//    self.guideValue =[NSString stringWithFormat:@"%d%d",years,months];
//    if (days==0) {
//        return YES;
//    }
//    NSLog(@"dateStr ...%@",dateStr);
//    return NO;
}

下面简单说一下算法原理：

1.把时间转换成数字

年份*10000+月份*100+日期，（2013-9-22 转换后为20130922）

2.当前时间减去生日当天得到差值

    int currentNumb = currentDateYear *10000+currentDateMonth*100+currentDateDay;
    int userNumb = userDateYear*10000 + userDateMonth*100 +userDateDay;
    int ageNumb = currentNumb - userNumb;

3.除以10000换算岁数

int years = 0;
    int months = 0;
    int days = 0;
    if (ageNumb>=10000) {//有一岁
        years = ageNumb/10000;
    }

4.换算月数，（为什么要-88，注：88+12=100）

 ageNumb = ageNumb%10000;
    months = ageNumb/100;
    if (months>12) {
        months -=88;
    }

5换算天数，天数换算要减去上个月的天数，所以用当月的第一天减去24小时就是上个月的最后一天，然后获取上月总天数

days = ageNumb%100;
    //当月第一天
    NSString *firstStr = [NSString stringWithFormat:@"%d.%d.01",currentDateYear,currentDateMonth];
    NSDate *firstDay = [formatter dateFromString:firstStr];
    NSTimeInterval firstInterval = [firstDay timeIntervalSince1970];
    NSTimeInterval lastInterval =  firstInterval-24*3600;//上个月的最后一天
    NSDate *lastDay = [NSDate dateWithTimeIntervalSince1970:lastInterval];
    //上个月的天数
    NSRange range = [[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:lastDay];
    NSUInteger numberOfDaysInMonth = range.length;
    if (days>currentNumb%100) {
        days = days-(100-numberOfDaysInMonth);
    }