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IOS开发-影院选座算法 限制产生孤座

众所周知目前影院选座是不允许随便选的,我们不可以任性的挑三拣四,最后留下N个单独的座位,目的就是要留下至少2个连着的座位;

另外有些影院的座位摆放并不是规则的,有些座位被过道或者特殊座位分割开,产生了不同的分区,这里就实现检测有没有座位变成了孤座,

孤座的含义简单说就是两个小情侣不能挨着坐了~

但是也存在特殊情况,及因为分区的缘故,某一排连着的座位只有2个,或者只有3个,这时候还是可以允许人家买其中之一,或者之二的~

好,条件说完之后,开始介绍数据结构,正常情况下,影院的每一个座位数据会包含坐标,座位号,如x,y,row,column。

其中,影厅中的面积会以单个座位的大小被分割成M*N的坐标系,即过道也有它的坐标;而row和column才是真正的座位;

啰嗦了半天,下面上代码:

入口函数是verifySelectedSeatsWithSeatsDic,

  1. 参数seatsDic是一个字典,注意该字典过滤掉了非座位的数据!(字典是本项目所需,你可以直接用一个array,方法中我也是获取了array;注意座位数据的顺序一定是有序的,这样才能获取到一个座位的左右座位)

  2. 每个座位的数据我封装成了一个WCSeatButton,并提供了isSeatAvailable方法判断该座位是否可以被购买(未被售出)

  3. 函数getNearBySeatsInSameRowForSeat负责获取没有被过道等非座位隔开的所有座位

    4. 函数(BOOL)isSeat:(WCSeatButton *)s1 nearBySeatWithoutRoad:(WCSeatButton *)s2判断两个座位是否被过道隔开

-(BOOL)verifySelectedSeatsWithSeatsDic:(NSDictionary *)seatsDic {    NSArray *seatBtns = [seatsDic allValues];    if ([seatBtns count] > 0) {        for (WCSeatButton *btn in seatBtns) {            //查看可选座位是否落单            if([btn isSeatAvailable]){                int idx = btn.seatIndex;                WCSeatButton *preBtn = [seatsDic objectForKey:[NSString stringWithFormat:@"%i", idx - 1]];                WCSeatButton *nextBtn = [seatsDic objectForKey:[NSString stringWithFormat:@"%i", idx + 1]];                //检验是否存在相邻座位 and 可用                BOOL isPreOK = preBtn != nil &&                        [preBtn.serviceSeat.row isEqualToString:btn.serviceSeat.row] &&                        [preBtn isSeatAvailable];                BOOL isNextOK = nextBtn != nil &&                        [nextBtn.serviceSeat.row isEqualToString:btn.serviceSeat.row]&&                        [nextBtn isSeatAvailable] ;                //再判断同一分区                if (isPreOK) {                    isPreOK =  ABS([btn.serviceSeat.yCoord intValue] - [preBtn.serviceSeat.yCoord intValue]) == 1;                }                if (isNextOK) {                    isNextOK = ABS([btn.serviceSeat.yCoord intValue] - [nextBtn.serviceSeat.yCoord intValue]) == 1;                }                if (!isPreOK && !isNextOK) {                    NSArray *nearBySeats = [self getNearBySeatsInSameRowForSeat:btn withSeatsDic:seatsDic];                    //例外 两个座位只选一个                    if ([nearBySeats count] == 2) {                        continue;                    }                    //例外 3个座位中2个连续被选,剩下单个座位                    if ([nearBySeats count] == 3) {                        int idx = [nearBySeats indexOfObject:btn];                        //空座位如果在两边说明中间的座位已经被选,则只要还有一个被选就可以                        if (idx == 0 && ![nearBySeats[2] isSeatAvailable]) {                            continue;                        }else if(idx == 2 && ![nearBySeats[0] isSeatAvailable]) {                            continue;                        }                    }                    //只限制当前用户选择的座位,防止其他渠道产生孤座导致当前用户不能选座                    for (WC630ServiceSeat *s in self.orderItem.seats) {                         if((preBtn && [[[preBtn serviceSeat] cineSeatId] isEqualToString:s.cineSeatId]) ||                                 (nextBtn && [[[nextBtn serviceSeat] cineSeatId] isEqualToString:s.cineSeatId])    ) {                             return NO;                         }                    }                }            }        }    }    return YES;}-(NSArray *)getNearBySeatsInSameRowForSeat:(WCSeatButton *)seat withSeatsDic:(NSDictionary *)seatsDic{    NSMutableArray *result = [NSMutableArray array];    [result addObject:seat];    int idx = seat.seatIndex - 1;    //left    WCSeatButton *tmp= [seatsDic objectForKey:[NSString stringWithFormat:@"%i", idx]];    while([self isSeat:tmp nearBySeatWithoutRoad:seat]){        [result insertObject:tmp atIndex:0];        idx--;        tmp = [seatsDic objectForKey:[NSString stringWithFormat:@"%i", idx]];    }    idx = seat.seatIndex + 1;    //right    tmp= [seatsDic objectForKey:[NSString stringWithFormat:@"%i", idx]];    while([self isSeat:tmp nearBySeatWithoutRoad:seat]){        [result addObject:tmp];        idx++;        tmp = [seatsDic objectForKey:[NSString stringWithFormat:@"%i", idx]];    }    return result;}-(BOOL)isSeat:(WCSeatButton *)s1 nearBySeatWithoutRoad:(WCSeatButton *)s2{    return     s1 != nil &&            [s1.serviceSeat.row isEqualToString:s2.serviceSeat.row] &&            ABS([s1.serviceSeat.yCoord intValue] - [s2.serviceSeat.yCoord intValue]) == ABS([s1.serviceSeat.column intValue] - [s2.serviceSeat.column intValue]) ;}

 

IOS开发-影院选座算法 限制产生孤座