EXC_BAD_ACCESS cocos2d - box2d

问题描述：

我正在抛出一个对象（box2d），但是当我尝试进行碰撞检测时，它给了我该对象的CGRect上的错误。见下图EXC_BAD_ACCESS cocos2d - box2d

enter image description here

，这就是我如何创建对象的身体

-(void) createObject 
{ 
    freeBodySprite = [CCSprite spriteWithFile:@"object.png"]; 
    //freeBodySprite.position = ccp(100, 300); 
    [self addChild:freeBodySprite z:2 tag:6]; 

    CGPoint startPos = CGPointMake(150, 320/1.25); 

    bodyDef.type = b2_staticBody; 
    bodyDef.position = [self toMeters:startPos]; 
    bodyDef.userData = freeBodySprite; 


    float radiusInMeters = ((freeBodySprite.contentSize.width * freeBodySprite.scale/PTM_RATIO) * 0.5f); 
    shape.m_radius = radiusInMeters; 


    fixtureDef.shape = &shape; 
    fixtureDef.density = 0.02f; 
    fixtureDef.friction = 1.0f; 
    fixtureDef.restitution = 0.0f; 

    circularObstacleBody = world->CreateBody(&bodyDef); 
    stoneFixture = circularObstacleBody->CreateFixture(&fixtureDef); 
    freeBody = circularObstacleBody; 

}

在exc_bad_access被引发的那一行代码之前，你确定'freeBodySprite'不是'nil'吗？ –

没有。有时它可以工作，有时不工作。 – Zohaib

答

我有一个计时器，每0.01秒计划一次。并且我在触摸结束时使freebody = nil，所以无论何时，当我的计时器方法运行时，它都会给我这个错误。

答

也许你正在失去freeBodySprite内存引用。

尝试将其创建为retain属性，并且始终在代码中使用self.freeBodySprite。

@property (nonatomic, retain) CCSprite *freeBodySprite; 

... 

self.freeBodySprite = [CCSprite spriteWithFile:@"object.png"]; 

... 

self.freeBodySprite.position.x;

EXC_BAD_ACCESS cocos2d - box2d

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