Question

我似乎无法弄清楚为什么出现了错误的访问代码，有人可以帮忙吗？我有代码添加一个精灵和一个发射器节点，每个节点都有自己的物理体。现在，精灵在地图上移动，并且有一个跟随它的摄像头。精灵的父亲是myWorld，它本身就是场景的孩子。当我尝试在移动的精灵（初始化关节时没有移动）之间添加一个physicsJoint时，我得到一个糟糕的访问代码。这是代码：

    self.sprite = [SKSpriteNode spriteNodeWithImageNamed:@"Spaceship"];

    self.sprite.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
    [self.sprite setScale:.5];
    self.sprite.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.sprite.size];
    self.sprite.physicsBody.mass = 50;
    self.sprite.physicsBody.affectedByGravity = NO;
    self.sprite.name = @"sprite";
    self.sprite.zPosition = 5;
    self.sprite.physicsBody.velocity = CGVectorMake(300, 0);
    self.sprite.physicsBody.categoryBitMask = plane;
    self.sprite.physicsBody.collisionBitMask = ships;
    self.sprite.physicsBody.affectedByGravity = YES;


    NSString *firePath = [[NSBundle mainBundle] pathForResource:@"MyParticle" ofType:@"sks"];
    self.smokeTrail = [SKEmitterNode node];
    self.smokeTrail = [NSKeyedUnarchiver unarchiveObjectWithFile:firePath];
    self.smokeTrail.position = CGPointMake(self.sprite.position.x-2*self.sprite.size.width/5, self.sprite.position.y);
    [self.smokeTrail setScale:1];
    self.smokeTrail.zPosition = self.sprite.zPosition-1;
    self.smokeTrail.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.smokeTrail.frame.size];
    self.smokeTrail.physicsBody.dynamic = YES;
    self.smokeTrail.physicsBody.affectedByGravity = NO;
    self.smokeTrail.physicsBody.categoryBitMask = 0;

    smokeJoint = [SKPhysicsJointFixed jointWithBodyA:self.sprite.physicsBody bodyB:self.smokeTrail.physicsBody anchor:CGPointMake(self.smokeTrail.position.x+self.smokeTrail.frame.size.width/2,self.smokeTrail.position.y)];

    ...

    [myWorld setScale:0.4f];

    self.sprite.physicsBody.velocity = CGVectorMake(0, 0);

    [self addChild:myWorld];
    [self addChild:backgroundNode];
    [self addChild:buttonDown];
    [self addChild:buttonUp];
    [myWorld addChild:blueBox];
    [self addChild:self.speed];
    [self addChild:self.altitude];
    [self addChild:self.darkBlueWave];
    [self addChild:self.lightBlueWave];

    [myWorld addChild:self.smokeTrail];
    [myWorld addChild:self.sprite];
    [myWorld addChild:randomNode];
    [myWorld addChild:camera];

    [self.physicsWorld addJoint:smokeJoint];  // Bad Access Code Happens Here

PhysicsJoint上的错误访问代码

0 个答案: