添加SKPhysicsJointLimit后SKPhysicsBodies不冲突

Question

我目前有两个添加了SKPhysicsBodies的SKSpriteNodes。当它们没有连接SKJoint时，它们会像预期的那样发生碰撞。一旦我添加了SKPhysicsJoint，它们就会直接相互传递。任何关节我都会正确地添加函数，但SKPhysicsJointLimit只限制节点彼此之间的距离，而不是它们可以接近的程度。我该如何解决这个问题呢？

以下是我用于关节的代码：

let joint = SKPhysicsJointLimit.joint(withBodyA: object1.physicsBody!, bodyB: object2.physicsBody!, anchorA: CGPoint(x: object1.position.x + iconController.position.x, y: object1.position.y + iconController.position.y), anchorB: CGPoint(x: object2.position.x + iconController.position.x, y: object2.position.y + iconController.position.y))
    joint.maxLength = screen.height * 0.4

physicsWorld.add(joint)

两个节点的PhysicsBody：

self.physicsBody = SKPhysicsBody(circleOfRadius: self.size.width / 2)
self.physicsBody?.allowsRotation = false
self.physicsBody?.friction = 0
self.physicsBody?.mass = 0.1

对于上面的SKPhysicsBody修改，我用不同的值对它进行了测试，它的性能是一样的。

Answer 1

SKPhysicsJoint对象将两个物理体连接在一起，以便物理世界可以一起模拟它们。您还可以使用SKPhysicJointPin

销连接允许两个实体围绕锚点独立旋转，就像将它们固定在一起一样。

如果您的对象在使用物理引擎添加SKPhysicsJoint之前工作良好，因此它们会像您希望的那样和您设置的那样触发didBeginContact，我认为您的问题只是一个错误的锚。尝试添加：

let skView = self.view as! SKView skView.showsPhysics = true

对于你的场景初始化代码:你会看到一个物理物体的轮廓，也许你会立即看到这个问题。

为了帮助您，我将尝试创建一个配置为相互碰撞的元素的示例：

enum CollisionTypes: UInt32 {
    case Boundaries = 1
    case Element = 2
}

class GameScene: SKScene,SKPhysicsContactDelegate {
    private var elements = [SKNode]()
    override func didMoveToView(view: SKView) {
        physicsWorld.gravity = CGVector(dx: 0, dy: 0)
        self.physicsWorld.contactDelegate = self
        let boundariesFrame = CGRectMake(20, 20, 200, 400)
        let boundaries = SKShapeNode.init(rect: boundariesFrame)
        boundaries.position = CGPointMake(350,150)
        let boundariesBody = SKPhysicsBody.init(edgeLoopFromRect: boundariesFrame)
        boundariesBody.dynamic = false
        boundariesBody.categoryBitMask = CollisionTypes.Boundaries.rawValue
        boundariesBody.contactTestBitMask = CollisionTypes.Element.rawValue
        boundaries.physicsBody = boundariesBody
        addChild(boundaries)
        for index in 0..<5 {
            let element = SKShapeNode(circleOfRadius: 10)
            let body = SKPhysicsBody(circleOfRadius: 10)
            body.linearDamping = 0
            // body.mass = 0
            body.dynamic = true
            body.categoryBitMask = CollisionTypes.Element.rawValue
            body.contactTestBitMask = CollisionTypes.Boundaries.rawValue | CollisionTypes.Element.rawValue
            body.collisionBitMask = CollisionTypes.Boundaries.rawValue | CollisionTypes.Element.rawValue
            element.physicsBody = body
            element.position = CGPoint(x: size.width / 2, y: size.height / 2 - 30 * CGFloat(index))
            elements.append(element)
            addChild(element)
        }
    }
}

希望它能帮助你找到你的问题。