// 判断自然日间隔
- (BOOL)isMoreThanNDays:(NSInteger)days lastDate:(NSDate *)lastDate {
    if (!lastDate) {
        return YES;
    }
    NSTimeInterval lastInterval = [lastDate timeIntervalSince1970];
    NSTimeInterval currentInterval = [[NSDate date] timeIntervalSince1970];
    NSInteger daySec = 24 * 60 * 60;
    NSInteger lastDays = lastInterval / daySec;
    NSInteger currentDays = currentInterval / daySec;
    return (currentDays - lastDays) > days;
}

// 判断24小时间隔
- (BOOL)isMoreThanNDaysFromNow:(NSInteger)days lastDate:(NSDate *)lastDate {
    if (!lastDate) {
        return YES;
    }
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *components = [calendar components:NSCalendarUnitDay fromDate: lastDate toDate:[NSDate date] options:0];
    return components.day > days;
}