在 SpriteKit 中，未检测到 SKPhysicsContactDelegate 接触

Question

我正尝试在 Swift 中使用 Spritekit 编写游戏。目的是逃脱他的角色迎面而来的矩形。现在我在 SKPhysicsContactDelegate (didBegin ()) 方法中犯了一个错误，因此无法识别图形与其中一个矩形的接触。谁能帮我找出错误？

    import SpriteKit

enum bodyType: UInt32 {
    case rechteckRechts = 1
    case rechteckLinks = 2
    case figur = 4
}

class PlayScene: SKScene, SKPhysicsContactDelegate {

    let figur = SKSpriteNode(imageNamed: "Punkt.jpg")

    @objc func addRechteck(){
        let rechteckRechts = SKSpriteNode(imageNamed: "Rechteck.gif")
        rechteckRechts.physicsBody = SKPhysicsBody()
        rechteckRechts.physicsBody?.isDynamic = false
        rechteckRechts.physicsBody?.categoryBitMask = bodyType.rechteckRechts.rawValue

        let rechteckLinks = SKSpriteNode(imageNamed: "Rechteck.gif")
        rechteckLinks.physicsBody = SKPhysicsBody()
        rechteckLinks.physicsBody?.isDynamic = false
        rechteckLinks.physicsBody?.categoryBitMask = bodyType.rechteckLinks.rawValue

        let groesse = arc4random_uniform(5)+1
        print(groesse)

        switch groesse {
        case 1:
            rechteckLinks.xScale = 0.5
            rechteckRechts.xScale = 1.5
        case 2:
            rechteckLinks.xScale = 1.5
            rechteckRechts.xScale = 0.5
        case 3:
            rechteckLinks.xScale = 1
            rechteckRechts.xScale = 1
        case 4:
            rechteckLinks.xScale = 1.25
            rechteckRechts.xScale = 0.75
        case 5:
            rechteckLinks.xScale = 0.75
            rechteckRechts.xScale = 1.25
        default:
            print("Fehler in der Wahrscheinlichkeit!!!")
        }
        rechteckRechts.position = CGPoint(x: frame.minX + (rechteckRechts.size.width / 2), y: frame.maxY)
        rechteckLinks.position = CGPoint(x: frame.maxX - (rechteckLinks.size.width / 2), y: frame.maxY)

        let moveDown = SKAction.moveBy(x: 0, y: -5000, duration: 20.0)
        rechteckLinks.run(moveDown)
        rechteckRechts.run(moveDown)

        self.addChild(rechteckRechts)
        self.addChild(rechteckLinks)
    }

    override func didMove(to view: SKView) {
        physicsWorld.gravity = .zero
        physicsWorld.contactDelegate = self

        figur.xScale = 0.4
        figur.yScale = 0.4
        figur.position = CGPoint(x: frame.midX, y: frame.maxY / 4)
        figur.physicsBody = SKPhysicsBody()
        figur.physicsBody?.isDynamic = false
        figur.physicsBody?.categoryBitMask = bodyType.figur.rawValue
        self.addChild(figur)

        self.backgroundColor = SKColor.white

        let wait1 = SKAction.wait(forDuration: 3)
        let timer = SKAction.repeatForever(SKAction.sequence([wait1, SKAction.run {
            self.addRechteck()
            }]))
        self.run(timer, withKey: "addRechteck")

    }

    func didBegin(_ contact: SKPhysicsContact) {
        let contactMask = contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask

        switch contactMask {
        case bodyType.figur.rawValue | bodyType.rechteckLinks.rawValue:
            print("contact")
        case bodyType.figur.rawValue | bodyType.rechteckRechts.rawValue:
            print("contact")
        default:
            return
        }
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in (touches ){
            let location = touch.location(in: self)
            if figur.contains(location){
                figur.position = location
            }
        }
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in (touches ) {
            let location = touch.location(in: self)
            if figur.contains(location){
                figur.position = location
            }
        }
    }
}

Answer 1

您似乎没有设置碰撞和接触测试位掩码。这些是物理体的属性。 collisionBitMask 控制哪些对象从其他对象反弹。默认情况下，所有内容都会反弹。

contactTestBitMask 在这种情况下很重要，因为它控制在联系其他对象时哪些对象调用“didBegin”。默认情况下，这是 0，这意味着没有注册联系人。请在此处查看我的回答：以获得详细说明。

在您的具体示例中，您似乎想知道 figur 何时与 rechteckLinks 或 rechteckRechts 联系，因此您需要关注 contactTestBitMasks：

figur.physicsBody!.cagegoryBitMask = bodyType.figur
figur.physicsBody!.contactTestBitMask = bodyType.rechteckRechts | bodyType.rechteckLinks

编辑：更正 figur 物理体的定义：

我们改变了？到！这样，如果物理体不存在，我们就会崩溃。我们还将 isDynamic 属性更改为 true 因为不是动态的物理实体无法注册联系人（我认为）。其他 2 个不是动态的也可以。我们将 collisionTestBitMask 分配给我们希望收到碰撞通知的所有类别的值，逻辑上“或”在一起：

figur.physicsBody!.isDynamic = true 
figur.physicsBody!.categoryBitMask = bodyType.figur.rawValue
figur.physicsBody!.contactTestBitMask = bodyType.rechteckRechts.rawValue | bodyType.rechteckLinks.rawValue

在 SpriteKit 中，未检测到 SKPhysicsContactDelegate 接触

In SpriteKit SKPhysicsContactDelegate contact is not detected

swift

sprite-kit

skphysicscontact