iOS 依据Date获取x分钟前/x小时前/昨天/x天前/x个月前/x年前

Posted 2020-09-30 ljbguanli

  返回x分钟前/x小时前/昨天/x天前/x个月前/x年前

- (NSString *)timeInfo {
    return [NSDate timeInfoWithDate:self];
}

+ (NSString *)timeInfoWithDate:(NSDate *)date {
    return [self timeInfoWithDateString:[self stringWithDate:date format:[self ymdHmsFormat]]];
}

+ (NSString *)timeInfoWithDateString:(NSString *)dateString {
    NSDate *date = [self dateWithString:dateString format:[self ymdHmsFormat]];
    
    NSDate *curDate = [NSDate date];
    NSTimeInterval time = -[date timeIntervalSinceDate:curDate];
    
    int month = (int)([curDate month] - [date month]);
    int year = (int)([curDate year] - [date year]);
    int day = (int)([curDate day] - [date day]);
    
    NSTimeInterval retTime = 1.0;
    if (time < 3600) { // 小于一小时
        retTime = time / 60;
        retTime = retTime <= 0.0 ?
 1.0 : retTime;
        return [NSString stringWithFormat:@"%.0f分钟前", retTime];
    } else if (time < 3600 * 24) { // 小于一天，也就是今天
        retTime = time / 3600;
        retTime = retTime <= 0.0 ?
 1.0 : retTime;
        return [NSString stringWithFormat:@"%.0f小时前", retTime];
    } else if (time < 3600 * 24 * 2) {
        return @"昨天";
    }
    // 第一个条件是同年，且相隔时间在一个月内
    // 第二个条件是隔年，对于隔年。仅仅能是去年12月与今年1月这样的情况
    else if ((abs(year) == 0 && abs(month) <= 1)
             || (abs(year) == 1 && [curDate month] == 1 && [date month] == 12)) {
        int retDay = 0;
        if (year == 0) { // 同年
            if (month == 0) { // 同月
                retDay = day;
            }
        }
        
        if (retDay <= 0) {
            // 获取公布日期中。该月有多少天
            int totalDays = (int)[self daysInMonth:date month:[date month]];
            
            // 当前天数 + （公布日期月中的总天数-公布日期月中公布日，即等于距离今天的天数）
            retDay = (int)[curDate day] + (totalDays - (int)[date day]);
        }
        
        return [NSString stringWithFormat:@"%d天前", (abs)(retDay)];
    } else  {
        if (abs(year) <= 1) {
            if (year == 0) { // 同年
                return [NSString stringWithFormat:@"%d个月前", abs(month)];
            }
            
            // 隔年
            int month = (int)[curDate month];
            int preMonth = (int)[date month];
            if (month == 12 && preMonth == 12) {// 隔年。但同月，就作为满一年来计算
                return @"1年前";
            }
            return [NSString stringWithFormat:@"%d个月前", (abs)(12 - preMonth + month)];
        }
        
        return [NSString stringWithFormat:@"%d年前", abs(year)];
    }
    
    return @"1小时前";
}