Ios Sprite套件销接头的固定点似乎不正确

我正在用Sprite套件测试销接头，我发现一些不寻常的事情发生了

我想要的设置是：一个宽而平的盒子和两个圆；这些圆通过SKPhysicSpinpoints连接到长方体，因此它们可以充当轮子

这是我的密码。我已经尽力使它尽可能简洁：

- (SKNode*) createWheelWithRadius:(float)wheelRadius {
    CGRect wheelRect = CGRectMake(-wheelRadius, -wheelRadius, wheelRadius*2, wheelRadius*2);

    SKShapeNode* wheelNode = [[SKShapeNode alloc] init];
    wheelNode.path = [UIBezierPath bezierPathWithOvalInRect:wheelRect].CGPath;

    wheelNode.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:wheelRadius];

    return wheelNode;
}


- (void) createCar {

    // Create the car
    SKSpriteNode* carNode = [SKSpriteNode spriteNodeWithColor:[SKColor yellowColor] size:CGSizeMake(150, 50)];
    carNode.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:carNode.size];
    carNode.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
    [self addChild:carNode];

    // Create the left wheel
    SKNode* leftWheelNode = [self createWheelWithRadius:30];
    leftWheelNode.position = CGPointMake(carNode.position.x-80, carNode.position.y);
    [self addChild:leftWheelNode];

    // Create the right wheel
    SKNode* rightWheelNode = [self createWheelWithRadius:30];
    rightWheelNode.position = CGPointMake(carNode.position.x+80, carNode.position.y);
    [self addChild:rightWheelNode];

    // Attach the wheels to the body
    CGPoint leftWheelPosition = leftWheelNode.position;
    CGPoint rightWheelPosition = rightWheelNode.position;

    SKPhysicsJointPin* leftPinJoint = [SKPhysicsJointPin jointWithBodyA:carNode.physicsBody bodyB:leftWheelNode.physicsBody anchor:leftWheelPosition];
    SKPhysicsJointPin* rightPinJoint = [SKPhysicsJointPin jointWithBodyA:carNode.physicsBody bodyB:rightWheelNode.physicsBody anchor:rightWheelPosition];

    [self.physicsWorld addJoint:leftPinJoint];
    [self.physicsWorld addJoint:rightPinJoint];
}

我期望的是，销接头锚固在其中心点；然而，当我测试这一点时，关节的锚似乎离得很远

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我是否遗漏了一些非常明显的东西？

试试这段代码，我使用了你的代码，但遇到了一些奇怪的问题，所以从零开始

- (SKShapeNode*) makeWheel
{
    SKShapeNode *wheel = [[SKShapeNode alloc] init];
    CGMutablePathRef myPath = CGPathCreateMutable();
    CGPathAddArc(myPath, NULL, 0,0, 16, 0, M_PI*2, YES);
    wheel.path = myPath;
    return wheel;
}


- (void) createCar 
{

    self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:CGRectMake(0, 0, self.size.width, self.size.height)];

    // 1. car body
    SKSpriteNode *carBody = [SKSpriteNode spriteNodeWithColor:[UIColor whiteColor] size:CGSizeMake(120, 8)];
    carBody.position = CGPointMake(200, 200);
    carBody.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:carBody.size];
    [self addChild:carBody];

    // 2. wheels
    SKShapeNode *leftWheel = [self makeWheel];
    leftWheel.position = CGPointMake(carBody.position.x - carBody.size.width / 2, carBody.position.y);
    leftWheel.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:16];
    [self addChild:leftWheel];

    SKShapeNode *rightWheel = [self makeWheel];
    rightWheel.position = CGPointMake(carBody.position.x + carBody.size.width / 2, carBody.position.y);
    rightWheel.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:16];
    [self addChild:rightWheel];

    // 3. Join wheels to car
    [self.physicsWorld addJoint:[SKPhysicsJointPin jointWithBodyA:carBody.physicsBody bodyB:leftWheel.physicsBody anchor:leftWheel.position]];
    [self.physicsWorld addJoint:[SKPhysicsJointPin jointWithBodyA:carBody.physicsBody bodyB:rightWheel.physicsBody anchor:rightWheel.position]];

    // 4. drive car
    [carBody.physicsBody applyForce:CGVectorMake(10, 0)];
}

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我也有这个问题，原因是在设置精灵位置之前设置了物理体

carNode.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:carNode.size];
carNode.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));

将上述内容更改为

carNode.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
carNode.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:carNode.size];

它应该会起作用。谢谢你，斯密克

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很好的小例子，在TVC中，您可以在TableView中注释出NumberOfSection，对于numberOfRowsInSection，只需使用[\u dataSourceArray count]。这是一个很好的例子，您应该添加[head.physicsBody applyTorque:0.2]；连接到销连接，以真正显示其与固定连接的差异。干得好-谢谢分享。谢谢你，斯密克。。我更新了示例。但是，TVC是这样编码的，因为它有两个部分。我无法将您的汽车示例添加为关节类型。：）该示例放在不同的部分。我现在看不到示例中的汽车，仍然只有接头列表。我将把我所有的测试代码放进一个TVC-酷的想法中@巴万：我用你的密码连接到斯普林泰诺德。但它改变了我的spritenode的位置。你能帮帮我吗？非常感谢！我将Bavan的答案标记为正确，因为它更简洁，更便于未来读者理解，但您首先提供了正确的解决方案。@DogCoffee:我已使用您的代码连接到Spritodes。但它改变了我的spritenode的位置。你能帮帮我吗？@Nirav我建议你发一个新问题。我有一段时间没用雪碧套装了。