Xcode 使用spritkit为游戏创建暂停功能

我用spritkit创建了一个比赛游戏

我创建了一个按钮，如果用户点击它，它会暂停游戏，我的问题是，场景停止移动，但汽车会像真正的汽车一样缓慢停止，我想在没有重力的情况下停止

这是我的密码

    physicsWorld.gravity = CGVectorMake(0.0,0.3);
    physicsWorld.contactDelegate = self

这是玩家代码

        playerNode = SKSpriteNode(imageNamed: "car")
        playerNode!.position = CGPoint(x: size.width / 2.0, y: 120.0)
        playerNode!.physicsBody =
            SKPhysicsBody(circleOfRadius: playerNode!.size.width / 2)
        playerNode!.physicsBody!.dynamic = true
        playerNode!.physicsBody!.linearDamping = 1.0
        playerNode!.physicsBody!.allowsRotation = true
        playerNode!.physicsBody!.categoryBitMask = CollisionCategoryPlayer
        playerNode!.physicsBody!.contactTestBitMask =
        CollisionCategoryPowerUpOrbs
        playerNode!.physicsBody!.collisionBitMask = 0
        foregroundNode!.addChild(playerNode!)

最后是暂停功能

 if (pasueornot){ // true or false
                physicsWorld.gravity = CGVectorMake(0.0,gravitySpeed)
            }
            else{
                physicsWorld.gravity = CGVectorMake(0.0,0.0) // the Scene stop from moving but the car will stop slowly like the real car pasueornot
            }

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使用SKView的属性怎么样：像这样

场景？.view？.paused=true

。关于使用

physicWorld.speed=0

自行暂停场景的问题，您好，谢谢：$