IOS開發-影院選座算法限制產生孤座

2019-11-14 19:43:20

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眾所周知目前影院選座是不允許隨便選的，我們不可以任性的挑三揀四，最后留下N個單獨的座位，目的就是要留下至少2個連著的座位；

另外有些影院的座位擺放并不是規則的，有些座位被過道或者特殊座位分割開，產生了不同的分區，這里就實現檢測有沒有座位變成了孤座，

孤座的含義簡單說就是兩個小情侶不能挨著坐了~

但是也存在特殊情況，及因為分區的緣故，某一排連著的座位只有2個，或者只有3個，這時候還是可以允許人家買其中之一，或者之二的~

好，條件說完之后，開始介紹數據結構，正常情況下，影院的每一個座位數據會包含坐標，座位號，如x，y，row，column。

其中，影廳中的面積會以單個座位的大小被分割成M*N的坐標系，即過道也有它的坐標；而row和column才是真正的座位；

啰嗦了半天，下面上代碼：

入口函數是verifySelectedSeatsWithSeatsDic，

　　1. 參數seatsDic是一個字典，注意該字典過濾掉了非座位的數據?。ㄗ值涫潜卷椖克瑁憧梢灾苯佑靡粋€array，方法中我也是獲取了array；注意座位數據的順序一定是有序的，這樣才能獲取到一個座位的左右座位）

　　2. 每個座位的數據我封裝成了一個WCSeatButton，并提供了isSeatAvailable方法判斷該座位是否可以被購買（未被售出）

　　3. 函數getNearBySeatsInSameRowForSeat負責獲取沒有被過道等非座位隔開的所有座位

　 4. 函數(BOOL)isSeat:(WCSeatButton *)s1 nearBySeatWithoutRoad:(WCSeatButton *)s2判斷兩個座位是否被過道隔開

-(BOOL)verifySelectedSeatsWithSeatsDic:(NSDictionary *)seatsDic {    NSArray *seatBtns = [seatsDic allValues];    if ([seatBtns count] > 0) {        for (WCSeatButton *btn in seatBtns) {            //查看可選座位是否落單            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]];                //檢驗是否存在相鄰座位 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] ;                //再判斷同一分區                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 兩個座位只選一個                    if ([nearBySeats count] == 2) {                        continue;                    }                    //例外 3個座位中2個連續被選，剩下單個座位                    if ([nearBySeats count] == 3) {                        int idx = [nearBySeats indexOfObject:btn];                        //空座位如果在兩邊說明中間的座位已經被選，則只要還有一個被選就可以                        if (idx == 0 && ![nearBySeats[2] isSeatAvailable]) {                            continue;                        }else if(idx == 2 && ![nearBySeats[0] isSeatAvailable]) {                            continue;                        }                    }                    //只限制當前用戶選擇的座位，防止其他渠道產生孤座導致當前用戶不能選座                    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]) ;}