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我正在尝试用SKSpriteNode. 物理和一切都很好，除了一件小事：当我的车从更远的距离降落在地面上时，车体被推下然后回到原位。

见图片： 落地后片刻的样子

我想得到左边的图像，但我得到了右边的那个。

当它降落在地面上时，我不希望身体进入轮子，我希望它相对于轮子处于固定位置，反之亦然。

所以这是我的做法：

这是在汽车类中：

carWheelJoint1 = SKPhysicsJointPin.jointWithBodyA(self.physicsBody!, bodyB: leftWheel.physicsBody!, anchor: leftWheel.position)
carWheelJoint2 = SKPhysicsJointPin.jointWithBodyA(self.physicsBody!, bodyB: rightWheel.physicsBody!, anchor: rightWheel.position)

这是在 GameScene 类中：

//Add vehicle
vehicle = DevCar(color: UIColor.blueColor(), size: CGSize(width: 250, height: 50), cameraThreshold: cameraThreshold)
vehicle.position = (CGPoint(x: 0, y: cameraThreshold))
addChild(vehicle)

self.physicsWorld.addJoint(vehicle.carWheelJoint1)
self.physicsWorld.addJoint(vehicle.carWheelJoint2)

我尝试使用SKPhysicsJointFixed，但这也不起作用。

有任何想法吗？

编辑：这就是physicsBody的定义方式：

这是汽车类中的车身。
汽车类是SKSpriteNode汽车本身的主体，轮子是它的孩子。

    let baseBody = SKPhysicsBody(rectangleOfSize: size)
    baseBody.mass = CGFloat(1)
    baseBody.dynamic = true
    baseBody.affectedByGravity = true
    baseBody.friction = 0.2
    baseBody.allowsRotation = false
    baseBody.density = CGFloat(10)

    self.physicsBody = baseBody

这是同一级别的轮体：

    leftWheel = SKShapeNode(circleOfRadius: wheelSize)
    leftWheel.position = CGPoint(x: size.width / -2 + wheelSize, y: size.height / -2 - wheelSize)

    rightWheel = SKShapeNode(circleOfRadius: wheelSize)
    rightWheel.position = CGPoint(x: size.width / 2 - wheelSize, y: size.height / -2 - wheelSize)

    leftWheel.physicsBody = SKPhysicsBody(circleOfRadius: wheelSize)
    leftWheel.physicsBody!.mass = CGFloat(0.2)
    leftWheel.physicsBody!.dynamic = true
    leftWheel.physicsBody!.affectedByGravity = true
    leftWheel.physicsBody!.friction = 0.3

    rightWheel.physicsBody = SKPhysicsBody(circleOfRadius: wheelSize)
    rightWheel.physicsBody!.mass = CGFloat(0.2)
    rightWheel.physicsBody!.dynamic = true
    rightWheel.physicsBody!.affectedByGravity = true
    rightWheel.physicsBody!.friction = 0.3

    addChild(leftWheel)
    addChild(rightWheel)

EDIT2：添加视频 https://www.youtube.com/watch?v=TTwa-t4u4pI

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