ios - 阻止 SKSpriteNode 离开 View (Swift)

Question

你好，我想防止 SKSpriteNode 离开屏幕，或者让节点在碰到屏幕边界时反弹回来。是否也可以在到达边界时调用函数？

如果发现这个问题Click

他在哪里使用这段代码:

let borderBody = SKPhysicsBody(edgeLoopFromRect: self.frame)
self.physicsBody = borderBody
borderBody.friction = 0.0
borderBody.restitution = 1.0

但出于某种原因，它只会阻止我的节点(动态的)移出顶部和底部，但它能够移出侧面。

(请记住，我是 SpriteKit 和 Swift 的新手)

编辑:我找到这段代码:

extension GameScene: SKPhysicsContactDelegate {
    func didBeginContact(contact: SKPhysicsContact!) {
        let contactMask = contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask

        switch (contactMask) {
        case BodyType.pipe.toRaw() |  BodyType.bomb.toRaw():
            println("Contact with a bomb")
            if contact.bodyA.categoryBitMask == BodyType.pipe.toRaw() {
                explode(pipe: contact.bodyA.node as SKSpriteNode)
            } else {
                explode(pipe: contact.bodyB.node as SKSpriteNode)
            }
        case BodyType.pipe.toRaw() |  BodyType.bird.toRaw():
            println("Contact with a pipe")
            bird.pushDown()
        case BodyType.ground.toRaw() | BodyType.bird.toRaw():
            println("Contact with ground")
            for actor in actors {
                actor.stop()
            }

            let shakeAction = SKAction.shake(0.1, amplitudeX: 20)
            screenNode.runAction(shakeAction)
        default:
            return
        }

    }

我读到它类似于设置类别？这段代码好用吗？

Answer 1

将物理体设置为屏幕大小

self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame)