跟踪另一个身体关节后的“身体”位置已经被摧毁

Question

我在两个身体之间建立了一个旋转关节。当另一个身体与其中一个身体接触时（参见下面的Contacter.mm）（身体带有标签== 90），我用标签== 90摧毁身体。我放置一个CCLOG来跟踪旋转关节的精灵位置身体没有被摧毁。 CCLOG工作正常，直到它的联合体被摧毁。然后CCLOG停止打印到控制台。我怎么解决这个问题？以下是相关代码。

Contacter.mm：

#import "Contacter.h"
#import "Box2D.h"

@implementation Contacter

@synthesize arrayOfBodies = _arrayOfBodies;
@synthesize spriteToDestroy = _spriteToDestroy;

-(void)destroyBodies:(b2Body*)body   {
_arrayOfBodies = [[NSMutableArray alloc] init];
NSValue *bodyValue = [NSValue valueWithPointer:body];
[_arrayOfBodies addObject:bodyValue];
}

-(void)physicsSpritesContact:(CCPhysicsSprite*)onePhysicsSprite otherSprite (CCPhysicsSprite*)twoPhysicsSprite; {
int firstTag = onePhysicsSprite.tag;
int secondTag = twoPhysicsSprite.tag;

if (((firstTag == 90) && (secondTag == 101 )) || ((firstTag == 101) && (secondTag == 90))) {

if (tag1 == 90) {
    [self destroyBodies:onePhysicsSprite.b2Body];// adds body to array to be destroyed
    spriteToDestroy = onePhysicsSprite; // taking note of sprite to be destroyed

}
else if (tag2 == 90)   {
    [self destroyBodies:twoPhysicsSprite.b2Body];
    spriteToDestroy = twoPhysicsSprite;
}
}

在更新方法中调用HelloWorldLayer.mm中的以下方法来使用（tag == 90）销毁正文和精灵：

-(void)removeDestroyedBodiesAndSprites  {
if ([bodyContact arrayOfBodies]) {

for (NSValue* bodyValue in [bodyContact arrayOfBodies]) {
    b2Body *removeBody;
    removeBody = (b2Body*)[bodyValue pointerValue];

    world->DestroyBody(removeBody);
    removeBody = NULL;
    [self removeChild:[bodyContact spriteToDestroy]];

       }
    }
        CCLOG(@"y value for Sam sprite %f",[Sam samPhysicsSprite].position.y); // here is the CCLOG
}