Objective c 在ARC中启动新的Cocos2d iPhone项目后获取内存警告。初学者

为了学习Cocos2d，我最近一直在自学objective-c

开始了一个新的项目，用一款经典的下落宝石俄罗斯方块游戏自学基础知识。我采取的第一步是使用edit>refactor为ARC启用项目，并选择模板中的最后4个文件

到目前为止，我们已经能够通过子类化CCSprite来添加一个带有动态着色的sprite的宝石，并将其沿XCoordinates移动，同时使其从顶部掉落。gems被赋予一个gemPos位置——例如5,3——以便我以后实现匹配方法

我得到一个EXC_BAD_访问警告，当几个区块在测试项目一段时间后堆叠在一起。如果启用ARC，我不明白为什么会发生这种情况

我笨拙的代码如下（遗漏了.h文件）：

默认helloworld层：

-(id) init
    {

        if( (self=[super init]) ) {

            oldGems = [[NSMutableArray alloc]init];

            [self setIsTouchEnabled:YES];

            [self newGem];

            [self scheduleUpdate];

        }
        return self;
    }

    - (void)registerWithTouchDispatcher
    {
        [[[CCDirector sharedDirector] touchDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];
    }

    - (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
    {
        CGPoint touchLocation = [self convertTouchToNodeSpace:touch];
        oldPos = touchLocation;
        return TRUE;
    }

    - (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
    {
        CGPoint touchLocation = [self convertTouchToNodeSpace:touch];
        [self updateXCoord:(CGPoint)touchLocation];
    }

    - (void)updateXCoord:(CGPoint)touchLocation
    {


        CGPoint distance = ccpSub(touchLocation, oldPos);
        float xDistance = distance.x;

        if (abs(xDistance) >= 36) {
            if (touchLocation.x > oldPos.x) {
                [_thisGem setPosition:ccp([_thisGem position].x + 36, [_thisGem position].y)];
                [_thisGem setGemPos:ccp([_thisGem gemPos].x+1,[_thisGem gemPos].y)];
                NSLog(@"The gem position is %@", NSStringFromCGPoint([_thisGem gemPos]));
                oldPos = touchLocation;
            } else {
                [_thisGem setPosition:ccp([_thisGem position].x - 36, [_thisGem position].y)];
                [_thisGem setGemPos:ccp([_thisGem gemPos].x-1,[_thisGem gemPos].y)];
                NSLog(@"The gem position is %@", NSStringFromCGPoint([_thisGem gemPos]));
                oldPos = touchLocation;
            }
        }


    }

    - (void)newGem
    {
        if (_thisGem) {
            PCGem *oldGem = _thisGem;
            NSLog(@"Old gem position at %@", NSStringFromCGPoint([oldGem gemPos]));
            [oldGems addObject:oldGem];
        }

        _thisGem = [[PCGem alloc] initWithGemColor];
        [_thisGem setPosition:ccp(160, 450)];
        [self addChild:_thisGem];
        [_thisGem setGemPos:ccp(4,10)];

        NSLog(@"Gem added with %@ color", [_thisGem gemColorName]);
    }

    - (void)update:(ccTime)dt
    {

        if ([_thisGem gemPos].y > 0)  {

            [self spaceBelowOccupied];

            [_thisGem setPosition:ccp([_thisGem position].x, [_thisGem position].y-1)];
            [_thisGem setGemPos:ccp([_thisGem gemPos].x, floor([_thisGem position].y / 36))];

        } else {
            [self newGem];
        }
    }

    - (void)spaceBelowOccupied
    {    
            for (PCGem *occupiedTile in oldGems) {
                if (CGRectIntersectsRect(occupiedTile.boundingBox, _thisGem.boundingBox)) {
                    NSLog(@"Collision detected!");
                    [self newGem];
                }
            }
    }

    - (id)initWithGemColor
    {
        if ((self = [super initWithFile:@"gemGS.png"])) {


            NSArray *gemColorList = [NSArray arrayWithObjects:(NSString *)@"blue", (NSString *)@"red", (NSString *)@"green", nil];

            NSInteger randColor = arc4random_uniform(3);

            switch (randColor) {
                case 0:
                {
                    [self setGemColorName:[gemColorList objectAtIndex:0]];

                    ccColor3B gemColorRGB = {0,0,255};
                    [self setColor:gemColorRGB];
                    break;
                }
                case 1:
                {
                    [self setGemColorName:[gemColorList objectAtIndex:1]];

                    ccColor3B gemColorRGB = {255,0,0};
                    [self setColor:gemColorRGB];            
                    break;
                }
                case 2:
                {
                    [self setGemColorName:[gemColorList objectAtIndex:2]];

                    ccColor3B gemColorRGB = {0,255,0};
                    [self setColor:gemColorRGB];
                    break;
                }
            }

        }

        return self;

    }

和我笨拙的PCGem类：

-(id) init
    {

        if( (self=[super init]) ) {

            oldGems = [[NSMutableArray alloc]init];

            [self setIsTouchEnabled:YES];

            [self newGem];

            [self scheduleUpdate];

        }
        return self;
    }

    - (void)registerWithTouchDispatcher
    {
        [[[CCDirector sharedDirector] touchDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];
    }

    - (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
    {
        CGPoint touchLocation = [self convertTouchToNodeSpace:touch];
        oldPos = touchLocation;
        return TRUE;
    }

    - (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
    {
        CGPoint touchLocation = [self convertTouchToNodeSpace:touch];
        [self updateXCoord:(CGPoint)touchLocation];
    }

    - (void)updateXCoord:(CGPoint)touchLocation
    {


        CGPoint distance = ccpSub(touchLocation, oldPos);
        float xDistance = distance.x;

        if (abs(xDistance) >= 36) {
            if (touchLocation.x > oldPos.x) {
                [_thisGem setPosition:ccp([_thisGem position].x + 36, [_thisGem position].y)];
                [_thisGem setGemPos:ccp([_thisGem gemPos].x+1,[_thisGem gemPos].y)];
                NSLog(@"The gem position is %@", NSStringFromCGPoint([_thisGem gemPos]));
                oldPos = touchLocation;
            } else {
                [_thisGem setPosition:ccp([_thisGem position].x - 36, [_thisGem position].y)];
                [_thisGem setGemPos:ccp([_thisGem gemPos].x-1,[_thisGem gemPos].y)];
                NSLog(@"The gem position is %@", NSStringFromCGPoint([_thisGem gemPos]));
                oldPos = touchLocation;
            }
        }


    }

    - (void)newGem
    {
        if (_thisGem) {
            PCGem *oldGem = _thisGem;
            NSLog(@"Old gem position at %@", NSStringFromCGPoint([oldGem gemPos]));
            [oldGems addObject:oldGem];
        }

        _thisGem = [[PCGem alloc] initWithGemColor];
        [_thisGem setPosition:ccp(160, 450)];
        [self addChild:_thisGem];
        [_thisGem setGemPos:ccp(4,10)];

        NSLog(@"Gem added with %@ color", [_thisGem gemColorName]);
    }

    - (void)update:(ccTime)dt
    {

        if ([_thisGem gemPos].y > 0)  {

            [self spaceBelowOccupied];

            [_thisGem setPosition:ccp([_thisGem position].x, [_thisGem position].y-1)];
            [_thisGem setGemPos:ccp([_thisGem gemPos].x, floor([_thisGem position].y / 36))];

        } else {
            [self newGem];
        }
    }

    - (void)spaceBelowOccupied
    {    
            for (PCGem *occupiedTile in oldGems) {
                if (CGRectIntersectsRect(occupiedTile.boundingBox, _thisGem.boundingBox)) {
                    NSLog(@"Collision detected!");
                    [self newGem];
                }
            }
    }

    - (id)initWithGemColor
    {
        if ((self = [super initWithFile:@"gemGS.png"])) {


            NSArray *gemColorList = [NSArray arrayWithObjects:(NSString *)@"blue", (NSString *)@"red", (NSString *)@"green", nil];

            NSInteger randColor = arc4random_uniform(3);

            switch (randColor) {
                case 0:
                {
                    [self setGemColorName:[gemColorList objectAtIndex:0]];

                    ccColor3B gemColorRGB = {0,0,255};
                    [self setColor:gemColorRGB];
                    break;
                }
                case 1:
                {
                    [self setGemColorName:[gemColorList objectAtIndex:1]];

                    ccColor3B gemColorRGB = {255,0,0};
                    [self setColor:gemColorRGB];            
                    break;
                }
                case 2:
                {
                    [self setGemColorName:[gemColorList objectAtIndex:2]];

                    ccColor3B gemColorRGB = {0,255,0};
                    [self setColor:gemColorRGB];
                    break;
                }
            }

        }

        return self;

    }

这就引出了另一个问题，我似乎找不到答案。在启用ARC的Cocos2d项目示例中，我看到了使用的节点便利方法，当然是alloc]init]autorelease]。但我想你不能使用自动释放和ARC，这会导致崩溃？这是怎么回事

对我的不幸有什么想法吗？请澄清：）

干杯

---

Adrian

我认为这可能是由于在数组中枚举时编辑数组造成的。在更新函数中，您可以调用SpaceBelowOccuped：

- (void)spaceBelowOccupied
{    
        for (PCGem *occupiedTile in oldGems) {
            if (CGRectIntersectsRect(occupiedTile.boundingBox, _thisGem.boundingBox)) {
                NSLog(@"Collision detected!");
                [self newGem];
            }
        }
}

然后，如果在for循环中调用了newGem，并且该循环成功：

if (_thisGem) {
        PCGem *oldGem = _thisGem;
        NSLog(@"Old gem position at %@", NSStringFromCGPoint([oldGem gemPos]));
        [oldGems addObject:oldGem];
    }

然后，在枚举数组时将对象添加到数组中。因此，请将您的SpaceBelowOccuped更改为此，并查看它是否有效：

 - (void)spaceBelowOccupied
{    
        for (PCGem *occupiedTile in [oldGems copy]) {
            if (CGRectIntersectsRect(occupiedTile.boundingBox, _thisGem.boundingBox)) {
                NSLog(@"Collision detected!");
                [self newGem];
            }
        }
}

---

通过这种方式，您可以复制一份oldGems进行枚举，一旦完成，它将自动删除。

哪一行实际崩溃？当我单击EXC_BAD_ACCESS notifier时，它会将我带到main.m（这表示哪些行崩溃？抱歉，新建），并指向：int retVal=UIApplicationMain（argc，argv，nil，@“AppController”）；它位于@autoreleasepool中。虽然这让我感到困惑，因为我认为启用ARC并不需要这样做？此外，通过使用NSLogs，我发现在我的-（void）末尾收到“gem added with%@color”消息时添加了一个新的gemnewGem方法，所以我认为这与更新方法有关？也许我试图以每秒60帧的速度一次做太多事情（快速枚举所有未使用的gem，以检测与当前下降的gem的碰撞-可以更有效地处理prob）？感谢Marcus的回复-我重新启动了项目，遇到了类似的问题，因此使用了不同的解决方案来解决问题…但我认为这可能就是问题所在！