ios对于时间转换 时间戳转需要文字

/**

 *  设置 天数

 */

- (void)setTimesLabelWithTime:(NSString*)strTime

{

    //计算

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

    [formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

    

    NSDate *datePKTime = [formatter dateFromString:strTime];

    

    NSDate *dateNow = [NSDate date];

    NSString *strToday = [formatter stringFromDate:[NSDate date]];

    NSInteger dayN = ([dateNow timeIntervalSince1970] - [datePKTime timeIntervalSince1970])/(3600*24);

    

    BOOL today = [[strTime substringToIndex:10] isEqualToString:[strToday substringToIndex:10]];

    if (today) {

        [_timeLabel setText:@"今天"];

    } else {

        if (dayN <= 1) {

            [_timeLabel setText:@"1天前"];

        } else if (dayN >1 && dayN <= 7) {

            [_timeLabel setText:[NSString stringWithFormat:@"%tu天前",dayN]];

        } else {

            BOOL thisYear = [[strTime substringToIndex:4] isEqualToString:[strToday substringToIndex:4]];

            if (thisYear) {

                [_timeLabel setText:[strTime substringWithRange:NSMakeRange(5, 5)]];

            }else {

                [_timeLabel setText:[strTime substringToIndex:10]];

            }

        }

    }

}