五子棋－b

五子棋是程序猿比较熟悉的一款小游戏,相信很多人大学时期就用多种语言写过五子棋小游戏.笔者工作闲暇之余,试着用OC实现了一下,在这里给大家分享一下.有不足之处,欢迎大家提供建议和指点!!!GitHub源码链接https://github.com/HelloYeah/Gomoku-Game

先上效果图

• 功能展示

  

  1.gif

• 初高级棋盘切换效果

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  2.gif

实现思路及主要代码详解

1.绘制棋盘

利用Quartz2D绘制棋盘.代码如下

- (void)drawBackground:(CGSize)size{    
    self.gridWidth = (size.width - 2 * kBoardSpace) / self.gridCount;    //1.开启图像上下文    
    UIGraphicsBeginImageContext(size);    //2.获取上下文    
    CGContextRef ctx = UIGraphicsGetCurrentContext();    CGContextSetLineWidth(ctx, 0.8f);    //3.1 画16条竖线    
    for (int i = 0; i <= self.gridCount; i ++) {        
        CGContextMoveToPoint(ctx, kBoardSpace + i * self.gridWidth , kBoardSpace);        CGContextAddLineToPoint(ctx, kBoardSpace + i * self.gridWidth , kBoardSpace + self.gridCount * self.gridWidth);    
    }    //3.1 画16条横线    
    for (int i = 0; i <= self.gridCount; i ++) {        
        CGContextMoveToPoint(ctx, kBoardSpace, kBoardSpace  + i * self.gridWidth );        CGContextAddLineToPoint(ctx, kBoardSpace + self.gridCount * self.gridWidth , kBoardSpace + i * self.gridWidth);    
    }    
    CGContextStrokePath(ctx);    //4.获取生成的图片    
    UIImage *image=UIGraphicsGetImageFromCurrentImageContext();    //5.显示生成的图片到imageview    
    UIImageView * imageView = [[UIImageView alloc]initWithImage:image];    
    [self addSubview:imageView];    
    UIGraphicsEndImageContext();
}

2.点击棋盘落子

1.根据落子位置求出该棋子的行号与列号.
2.判断落子位置是否已经有棋子,有则不能下.如果没有,将棋子保存在字典中,以列号和行号组合起来的字符串为key值.
 代码如下

//点击棋盘,下棋
- (void)tapBoard:(UITapGestureRecognizer *)tap{    
    CGPoint point = [tap locationInView:tap.view];    //计算下子的列号行号    
    NSInteger col = (point.x - kBoardSpace + 0.5 * self.gridWidth) / self.gridWidth;    NSInteger row = (point.y - kBoardSpace + 0.5 * self.gridWidth) / self.gridWidth;    NSString * key = [NSString stringWithFormat:@"%ld-%ld",col,row];    if (![self.chessmanDict.allKeys containsObject:key]) {        UIView * chessman = [self chessman];        
    chessman.center = CGPointMake(kBoardSpace + col * self.gridWidth, kBoardSpace + row * self.gridWidth);        
    [self addSubview:chessman];        
    [self.chessmanDict setValue:chessman forKey:key];        self.lastKey = key;        //检查游戏结果        
    [self checkResult:col andRow:row andColor:self.isBlack];        self.isBlack = !self.isBlack;    
    }
}

3.检测游戏结果

每落一个棋子就要多游戏结果进行一次检查,判断四个方向上是否有大于等于5个同色的棋子连成一线,有则提示游戏输赢结果,无则游戏继续.算法为,从当前棋子位置向前遍历,直到遇到与自己不同色的棋子,累加同色棋子的个数,再往后遍历,直到遇到与自己不同色的棋子,累加同色棋子的个数.得到该方向相连同色棋子的总个数
代码如下

//判断是否大于等于五个同色相连
- (BOOL)checkResult:(NSInteger)col andRow:(NSInteger)row andColor:(BOOL)isBlack andDirection:(GmkDirection)direction{    
    if (self.sameChessmanArray.count >= 5) {        
        return YES;    
    }    
    UIColor * currentChessmanColor = [self.chessmanDict[[NSString stringWithFormat:@"%ld-%ld",col,row]] backgroundColor];    
    [self.sameChessmanArray addObject:self.chessmanDict[self.lastKey]];    
    switch (direction) {        //水平方向检查结果        
        case GmkHorizontal:{            //向前遍历            
            for (NSInteger i = col - 1; i > 0; i --) {                
                NSString * key = [NSString stringWithFormat:@"%ld-%ld",i,row];                
                if (![self.chessmanDict.allKeys containsObject:key] || [self.chessmanDict[key] backgroundColor] != currentChessmanColor) break;                
                [self.sameChessmanArray addObject:self.chessmanDict[key]];            
            }            //向后遍历            
            for (NSInteger i = col + 1; i < kGridCount; i ++) {                NSString * key = [NSString stringWithFormat:@"%ld-%ld",i,row];                

                if (![self.chessmanDict.allKeys containsObject:key] || [self.chessmanDict[key] backgroundColor] != currentChessmanColor) break;                
                [self.sameChessmanArray addObject:self.chessmanDict[key]];            
            }            
            if (self.sameChessmanArray.count >= 5) {                
                [self alertResult];                
                return YES;            
            }            
            [self.sameChessmanArray removeAllObjects];          
       }            
            break;        
       case GmkVertical:{            //向前遍历            
           for (NSInteger i = row - 1; i > 0; i --) {                NSString * key = [NSString stringWithFormat:@"%ld-%ld",col,i];                if (![self.chessmanDict.allKeys containsObject:key] || [self.chessmanDict[key] backgroundColor] != currentChessmanColor) break;                
               [self.sameChessmanArray addObject:self.chessmanDict[key]];            
            }            //向后遍历            
            for (NSInteger i = row + 1; i < kGridCount; i ++) {                NSString * key = [NSString stringWithFormat:@"%ld-%ld",col,i];                if (![self.chessmanDict.allKeys containsObject:key] || [self.chessmanDict[key] backgroundColor] != currentChessmanColor) break;                
                [self.sameChessmanArray addObject:self.chessmanDict[key]];            
            }            
            if (self.sameChessmanArray.count >= 5) {                
                [self alertResult];                
                return YES;            
            }            
            [self.sameChessmanArray removeAllObjects];          
       }            
           break;        
        case GmkObliqueDown:{            //向前遍历            
           NSInteger j = col - 1;            
           for (NSInteger i = row - 1; i >= 0; i--,j--) {                NSString * key = [NSString stringWithFormat:@"%ld-%ld",j,i];                if (![self.chessmanDict.allKeys containsObject:key] || [self.chessmanDict[key] backgroundColor] != currentChessmanColor || j < 0) break;                
                   [self.sameChessmanArray addObject:self.chessmanDict[key]];            
           }            //向后遍历            
           j = col + 1;            
           for (NSInteger i = row + 1 ; i < kGridCount; i++,j++) {                NSString * key = [NSString stringWithFormat:@"%ld-%ld",j,i];                if (![self.chessmanDict.allKeys containsObject:key] || [self.chessmanDict[key] backgroundColor] != currentChessmanColor || j > kGridCount) break;                
               [self.sameChessmanArray addObject:self.chessmanDict[key]];            
           }            
           if (self.sameChessmanArray.count >= 5) {                
               [self alertResult];                
               return YES;            
            }            
            [self.sameChessmanArray removeAllObjects];           }            
            break;        
        case GmkObliqueUp:{            //向前遍历            
            NSInteger j = col + 1;            
            for (NSInteger i = row - 1; i >= 0; i--,j++) {                NSString * key = [NSString stringWithFormat:@"%ld-%ld",j,i];                if (![self.chessmanDict.allKeys containsObject:key] || [self.chessmanDict[key] backgroundColor] != currentChessmanColor || j > kGridCount) break;                
                [self.sameChessmanArray addObject:self.chessmanDict[key]];            
             }            //向后遍历            
             j = col - 1;            
            for (NSInteger i = row + 1 ; i < kGridCount; i++,j--) {                NSString * key = [NSString stringWithFormat:@"%ld-%ld",j,i];                if (![self.chessmanDict.allKeys containsObject:key] || [self.chessmanDict[key] backgroundColor] != currentChessmanColor || j < 0) break;                
                 [self.sameChessmanArray addObject:self.chessmanDict[key]];            
             }            
             if (self.sameChessmanArray.count >= 5) {                
                 [self alertResult];                
                 return YES;            
              }            
              [self.sameChessmanArray removeAllObjects];          
         }            
             break;    
     }    
    return NO;
}

4.对外提供,重新开始,悔棋,切换初高级棋盘的三个接口

重新开始

- (void)newGame{    
    self.isOver = NO;    
    self.lastKey = nil;    
    [self.sameChessmanArray removeAllObjects];    
    self.userInteractionEnabled = YES;    
    [self.chessmanDict removeAllObjects];    
    for (UIView * view in self.subviews) {        
        if ([view isKindOfClass:[UIImageView class]]) {            
            continue;        
        }        
        [view removeFromSuperview];    
     }    
     self.isBlack = NO;
}

悔棋

//撤回至上一步棋
- (void)backOneStep:(UIButton *)sender{    
    if(self.isOver) return;    
        if (self.lastKey == nil) {        
        sender.enabled = NO;        
        CGFloat width = SCREEN_WIDTH * 0.4 * SCREEN_WIDTH_RATIO;        UIView * tip = [[UIView alloc]initWithFrame:CGRectMake(0, 0, width, 0.6 * width)];         tip.backgroundColor = [UIColor colorWithWhite:1 alpha:0.8];        
        tip.layer.cornerRadius = 8.0f;        
        [self addSubview:tip];        
        tip.center = CGPointMake(self.width * 0.5, self.height * 0.5);        UILabel * label = [[UILabel alloc]init];        
        label.text = self.chessmanDict.count > 0 ? @"只能悔一步棋!!!" : @"请先落子!!!";        
        label.font = [UIFont systemFontOfSize:15];        
        [label sizeToFit];        
        label.center = CGPointMake(tip.width * 0.5, tip.height * 0.5);        
        [tip addSubview:label];        
        self.userInteractionEnabled = NO;        
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{            self.userInteractionEnabled = YES;            
        sender.enabled = YES;            
        [tip removeFromSuperview];          
        });        
        return;    
    }    
    [self.chessmanDict removeObjectForKey:self.lastKey];    
    [self.subviews.lastObject removeFromSuperview];    
    self.isBlack = !self.isBlack;    
    self.lastKey = nil;
}

切换初高级键盘

//改变键盘级别
- (void)changeBoardLevel{    
      for (UIView * view in self.subviews) {        
          [view removeFromSuperview];    
    }    
    [self newGame];    
    self.isHighLevel = !self.isHighLevel;    
    [self drawBackground:self.bounds.size];
}

Demo中的一个小技巧

用字典存放棋子,以棋子的列号和行号组合起来的字符串为key值,value值为棋子view.这样处理,在判断某行某列是否有棋子就非常简单了.
GitHub源码地址https://github.com/HelloYeah/Gomoku-Game

感谢分享