Sprite套件Swift中的碰撞检测

这是我第一次用iOS制作游戏,所以很自然地我遇到了几个问题。我已经设法解决了这些问题,但现在说到马里奥和管道之间的碰撞部分,我遇到了一些麻烦:

实际发生的情况:

未检测到任何碰撞。

import SpriteKit
import GameplayKit

class GameScene: SKScene, SKPhysicsContactDelegate {

    var mario = SKSpriteNode()

    enum ColliderType: UInt32 {

        case Mario = 1
        case Object = 2
    }

    func addPipes() {

        let pipetexture = SKTexture(imageNamed: "pipes")

        let pipes = SKSpriteNode(texture: pipetexture)

        let setScale = CGFloat(arc4random_uniform(19) + 15)

        pipes.setScale(setScale) //min 15, max 19

        pipes.position = CGPoint(x: self.frame.maxX, y: self.frame.minY)

        let movePipes = SKAction.move(by: CGVector(dx: -5 * self.frame.width, dy: 0), duration: TimeInterval(self.frame.width/100))

        let removePipes = SKAction.removeFromParent()

        let moveAndRemovePipes = SKAction.sequence([movePipes, removePipes])

        pipes.zPosition = +1

        pipes.physicsBody = SKPhysicsBody(rectangleOf: pipes.size)

        pipes.physicsBody!.isDynamic = false

        pipes.physicsBody!.contactTestBitMask = ColliderType.Object.rawValue
        pipes.physicsBody!.categoryBitMask = ColliderType.Object.rawValue
        pipes.physicsBody!.collisionBitMask = ColliderType.Mario.rawValue

        self.addChild(pipes)

        pipes.run(moveAndRemovePipes)

    }

    func didBegin(_ contact: SKPhysicsContact) {
        print("contact")
    }

    override func didMove(to view: SKView) {

        self.physicsWorld.contactDelegate = self

        _ = Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(self.addPipes), userInfo: nil, repeats: true)

        let marioTexture = SKTexture(imageNamed: "mariorun0.png")
        let marioTexture2 = SKTexture(imageNamed: "mariorun1.png")
        let marioTexture3 = SKTexture(imageNamed: "mariorun2.png")

        let animation = SKAction.animate(with: [marioTexture, marioTexture2, marioTexture3], timePerFrame: 0.1)

        let makeMarioRun = SKAction.repeatForever(animation)

        mario = SKSpriteNode(texture: marioTexture)

        mario.setScale(10)

        mario.position = CGPoint(x: -(self.frame.size.width/3.5), y: -(self.frame.size.height/2.8))

        mario.run(makeMarioRun)

        mario.physicsBody = SKPhysicsBody(rectangleOf: mario.size)

        mario.physicsBody!.isDynamic = false

        mario.physicsBody!.contactTestBitMask = ColliderType.Object.rawValue
        mario.physicsBody!.categoryBitMask = ColliderType.Mario.rawValue
        mario.physicsBody!.collisionBitMask = ColliderType.Object.rawValue

        self.addChild(mario)


        addPipes()

        mario.zPosition = +2

    }

}

我已经尝试将两个精灵的z位置设置为相同的值,但没有任何运气。

我最初担心的是图像太小,因此碰撞几乎无法检测到。但是,由于我正在放大两个节点,并使用放大图像的物理体,因此不会出现问题,但这也没有帮助。