两个精灵之间的碰撞不起作用

Question

我似乎无法让 2 个精灵相互联系，因为当应用程序运行时，其中一个精灵不会联系，而只是传递它。我不确定出了什么问题。有人可以帮我吗？

import SpriteKit
import GameplayKit
enum BodyType:UInt32{
    case caveMan = 1
    case Zombie = 2
}
class GameScene: SKScene, SKPhysicsContactDelegate {
    var caveMan:SKSpriteNode = SKSpriteNode ()
    let swipeRightRec = UISwipeGestureRecognizer ()
    var Zombie:SKSpriteNode = SKSpriteNode ()
    override func didMove(to view: SKView) {
        self.physicsWorld.contactDelegate = self
        swipeRightRec.addTarget(self, action: #selector (GameScene.swipedRight ))
        swipeRightRec.direction = .right
        self.view!.addGestureRecognizer(swipeRightRec)
        if let somePlayer:SKSpriteNode = self.childNode(withName: "caveMan") as? SKSpriteNode {
            caveMan = somePlayer
            caveMan.physicsBody?.affectedByGravity = true
            caveMan.physicsBody?.isDynamic = false
            caveMan.physicsBody?.categoryBitMask = BodyType.caveMan.rawValue
            caveMan.physicsBody?.collisionBitMask = BodyType.Zombie.rawValue
            caveMan.physicsBody?.contactTestBitMask = BodyType.Zombie.rawValue
        }
        if let somePlayer:SKSpriteNode = self.childNode(withName: "Zombie") as? SKSpriteNode {
            Zombie = somePlayer
            Zombie.physicsBody?.affectedByGravity = false
            Zombie.physicsBody?.isDynamic = false
            Zombie.physicsBody?.categoryBitMask = BodyType.Zombie.rawValue
            Zombie.physicsBody?.collisionBitMask = BodyType.caveMan.rawValue
            Zombie.physicsBody?.contactTestBitMask = BodyType.caveMan.rawValue   
        }
    }
    @objc func swipedRight() {
        print("went right")   
        moveDown()   
    }
    func moveDown() {
        let walkAnimation:SKAction = SKAction(named: "Running")!
        let walk:SKAction = SKAction.moveBy(x: 90, y: 0, duration: 1)
        let group:SKAction = SKAction.group([walkAnimation, walk])
        caveMan.run(group)  
    }
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for t in touches {
            self.touchDown(atPoint: t.location(in: self))
            break
        }
    }
    func didBegin(_ contact: SKPhysicsContact) {
        if (contact.bodyA.categoryBitMask == BodyType.caveMan.rawValue && contact.bodyB.categoryBitMask == BodyType.Zombie.rawValue) {
            print ("touched a Zombie")
        } else if (contact.bodyB.categoryBitMask == BodyType.caveMan.rawValue && contact.bodyA.categoryBitMask == BodyType.Zombie.rawValue) {
            print ("touched a Zombie")
        }
    }
}

Answer 1

看到这个： caveMan.physicsBody? 这意味着如果一个主体存在，那么允许设置一个值。 它在其他语言中称为可选绑定或短路。

您需要创建物理体，它不是免费给您的。

截至目前，您的代码如下所示：

    caveMan = somePlayer
    nil.affectedByGravity = true
    nil.isDynamic = false
    nil.categoryBitMask = BodyType.caveMan.rawValue
    nil.collisionBitMask = BodyType.Zombie.rawValue
    nil.contactTestBitMask = BodyType.Zombie.rawValue

您要做的是：

    caveMan = somePlayer
    caveMan.physicsBody = SKPhysicsBody(rectangleOf: caveMan.size)
    caveMan.physicsBody!.affectedByGravity = true
    caveMan.physicsBody!.isDynamic = false
    caveMan.physicsBody!.categoryBitMask = BodyType.caveMan.rawValue
    caveMan.physicsBody!.collisionBitMask = BodyType.Zombie.rawValue
    caveMan.physicsBody!.contactTestBitMask = BodyType.Zombie.rawValue