iOS-五子棋

导读

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

  
  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