ios - SKSpriteNode 脱离屏幕

Question

有人可以帮助我吗？我创建了一个名为(player)的 SpriteKit 节点，一旦我设置了它的物理特性，它就会从屏幕上掉下来​:

let player = SKSpriteNode(imageNamed: "car")
player.position.x = -300
player.zPosition = 1
player.physicsBody = SKPhysicsBody(texture: player.texture!, size: player.size)
player.physicsBody.categoryBitMask = 1
addChild(player)

我已经尝试添加

affectedByGravity 

但玩家和敌人的结果相同。

Answer 1

如果我明白了，你希望你的车不受重力的影响。 如果是这样，您可能需要设置“世界”的物理特性，例如:

    func setWorld() {
        self.backgroundColor = UIColor.white

        //This should do the trick!
        physicsWorld.gravity = CGVector(dx:0, dy:0)

        //This is useful if you want to create wall along the borders    
        let frame = CGRect(x: self.frame.minX, y: self.frame.minY, width: self.frame.width, height: self.frame.height)
        //here you set the borders as walls
        physicsBody = SKPhysicsBody(edgeLoopFrom: frame)

        physicsBody?.friction = 0
        physicsBody?.restitution = 1
        physicsBody?.linearDamping = 0
    }

并在didMove中调用这个函数