我正在Swift/Xcode中玩游戏编程，正在努力让冲突发挥作用。
我使用的是Xcode 8 Beta 3（因为我不能在MacOS Sierra上使用Xcode 7），所以它使用了新的Swift 3.0语法。游戏中有一只小狗（在SK场景文件中定义），它会跳跃并收集右侧投掷的物品。抛出的项在函数中创建，并在抛出新项时删除。
我需要接触投掷的物品来接触小狗。我打开了物理功能，物品从小狗身上弹了下来，但没有登记任何联系人。
这是我的密码。混乱代码的应用程序，但它在Swift上的第一次尝试，以及目前刚刚加入的一切。我看不出我做错了什么：（
更新：正如cocoajoe所建议的，我已经尝试将掩码设置为1，并简化了代码以删除对gamescene.sks文件的引用，并以编程方式创建了所有内容，但仍然不起作用。我已经更新了下面的代码，以反映最新版本的代码。。。
import SpriteKit
import AVFoundation
class GameScene: SKScene, SKPhysicsContactDelegate {
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder) is not used in this app")
}
override init(size: CGSize) {
super.init(size: size)
anchorPoint = CGPoint(x: 0.0, y: 0.0)
}
var isJumping = false
var gamePaused = false
var gameRunning = false
var playerScore = 0
var lastSpawnTime = 0
var lastTick = 0
var spawnDelay = 4
let PuppyCategory : UInt32 = 0x1 << 0
let ThrowableCategory : UInt32 = 0x1 << 1
let GroundCategory : UInt32 = 0x1 << 2
override func didMove(to view: SKView) {
physicsWorld.gravity = CGVector(dx: 0.0, dy: -9.8)
physicsWorld.contactDelegate = self
let background = SKSpriteNode(imageNamed: "bg")
background.anchorPoint = CGPoint(x: 0.0, y:0.0)
background.size = size
addChild(background)
// Set up Ground Object
let Ground = SKSpriteNode()
Ground.name = "Ground"
Ground.size = CGSize(width:frame.width, height: frame.height / 10)
Ground.position = CGPoint(x: frame.midX, y: Ground.frame.height / 2 )
Ground.zPosition = -20
Ground.color = SKColor.white()
// Set up the Physics
Ground.physicsBody = SKPhysicsBody(rectangleOf: Ground.size)
Ground.physicsBody!.categoryBitMask = GroundCategory
Ground.physicsBody!.contactTestBitMask = PuppyCategory | ThrowableCategory
Ground.physicsBody!.collisionBitMask = PuppyCategory | ThrowableCategory
Ground.physicsBody?.affectedByGravity = false
Ground.physicsBody?.allowsRotation = false
Ground.physicsBody?.isDynamic = false
Ground.physicsBody?.mass = 1.99999
// Initialise the Node
addChild(Ground)
// Create a Puppy
let Puppy = SKSpriteNode(imageNamed: "puppy1")
Puppy.name = "Puppy"
Puppy.position = CGPoint(x: frame.width / 10, y: frame.height / 2)
Puppy.size = CGSize(width: frame.width / 7, height: frame.height / 5)
Puppy.zPosition = 3
// Set up the Physics
Puppy.physicsBody = SKPhysicsBody(rectangleOf: Puppy.size)
Puppy.physicsBody!.categoryBitMask = PuppyCategory
Puppy.physicsBody!.contactTestBitMask = ThrowableCategory | GroundCategory
Puppy.physicsBody!.collisionBitMask = ThrowableCategory | GroundCategory
Puppy.physicsBody?.affectedByGravity = true
Puppy.physicsBody?.allowsRotation = false
Puppy.physicsBody?.isDynamic = true
Puppy.physicsBody?.mass = 1.99999
// Set up the Textures/Animation Frames
var TextureAtlas = SKTextureAtlas()
var TextureArray = [SKTexture]()
TextureAtlas = SKTextureAtlas(named: "puppy")
for i in 1...TextureAtlas.textureNames.count {
let Name = "puppy(i).png"
TextureArray.append(SKTexture(imageNamed: Name))
}
Puppy.run(SKAction.repeatForever(SKAction.animate(with:TextureArray, timePerFrame: 0.1)))
// Add the Sprite
addChild(Puppy)
let gameMessage = SKSpriteNode(imageNamed: "TapToPlay")
gameMessage.name = "GameMessage"
gameMessage.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
gameMessage.zPosition = 30
gameMessage.setScale(0.0)
addChild(gameMessage)
let gameLogo = SKSpriteNode(imageNamed: "pjlogo")
gameLogo.name = "GameLogo"
gameLogo.size = CGSize(width: frame.width / 3, height: frame.height / 5)
gameLogo.position = CGPoint(x: frame.midX, y: (frame.maxY / 100) * 80)
gameLogo.zPosition = 30
addChild(gameLogo)
let scale = SKAction.scale(to: 1.0, duration: 1)
scene?.childNode(withName: "GameMessage")!.run(scale)
if let musicURL = Bundle.main.urlForResource("bgmusic", withExtension: "mp3") {
var backgroundMusic: SKAudioNode!
backgroundMusic = SKAudioNode(url: musicURL)
addChild(backgroundMusic)
}
startNewGame()
}
func puppyJump() {
if gameRunning {
let Puppy = childNode(withName: "Puppy")
if !isJumping {
Puppy?.physicsBody?.applyImpulse(CGVector(dx: 0,dy: 1400))
isJumping = true
}
}
}
func generateThrowable() {
print("new enemy")
let oldItem = childNode(withName: "throwableItem")
oldItem?.removeFromParent()
let throwableItem = SKSpriteNode(imageNamed: "puppy1")
throwableItem.name = "throwableItem"
throwableItem.position = CGPoint(x: frame.maxX, y: frame.midY)
throwableItem.zPosition = 3
throwableItem.setScale(0.1)
throwableItem.physicsBody = SKPhysicsBody(rectangleOf: throwableItem.size)
throwableItem.physicsBody!.categoryBitMask = ThrowableCategory
throwableItem.physicsBody!.contactTestBitMask = PuppyCategory | GroundCategory
throwableItem.physicsBody!.collisionBitMask = PuppyCategory | GroundCategory
throwableItem.physicsBody?.friction = 0.1
throwableItem.physicsBody?.restitution = 0.1
throwableItem.physicsBody?.mass = 0.01
throwableItem.physicsBody?.affectedByGravity = true
throwableItem.physicsBody?.allowsRotation = true
throwableItem.physicsBody?.isDynamic = true
addChild(throwableItem)
throwableItem.physicsBody?.applyImpulse(CGVector(dx: -7,dy: 4))
let throwableTrail = SKEmitterNode(fileNamed: "particleTrail.sks")
throwableTrail?.name = "throwableTrail"
throwableTrail?.targetNode = scene
throwableItem.addChild(throwableTrail!)
}
func startNewGame() {
let logo = childNode(withName: "GameLogo")
let gameMessage = childNode(withName: "GameMessage")
logo?.removeFromParent()
gameMessage?.removeFromParent()
let gameScore = SKLabelNode(fontNamed: "Arial")
gameScore.name = "GameScore"
gameScore.text = "Score:0"
gameScore.horizontalAlignmentMode = SKLabelHorizontalAlignmentMode.right
gameScore.fontSize = 20
gameScore.position = CGPoint(x: frame.maxX - 20, y: frame.maxY - 26)
gameScore.zPosition = 30
addChild(gameScore)
let pauseButton = SKLabelNode(fontNamed: "Arial")
pauseButton.name = "pauseButton"
pauseButton.text = "PAUSE"
pauseButton.horizontalAlignmentMode = SKLabelHorizontalAlignmentMode.left
pauseButton.fontSize = 20
pauseButton.position = CGPoint(x: 20, y: frame.maxY - 26)
pauseButton.zPosition = 30
addChild(pauseButton)
gameRunning = true
}
func didBeginContact(contact: SKPhysicsContact) {
print("contact")
var firstBody: SKPhysicsBody
var secondBody: SKPhysicsBody
// 2
if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
firstBody = contact.bodyA
secondBody = contact.bodyB
} else {
firstBody = contact.bodyB
secondBody = contact.bodyA
}
// 3
if firstBody.categoryBitMask == PuppyCategory && secondBody.categoryBitMask == GroundCategory {
print("Hit bottom. First contact has been made.")
}
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
if gameRunning {
let gameScore = childNode(withName: "GameScore") as? SKLabelNode
gameScore?.text = "Score:(playerScore)"
let currentTick:Int = Int(ceil(currentTime))
if lastTick < currentTick {
lastTick = currentTick
}
if (lastSpawnTime + spawnDelay) < currentTick {
// Time to Spawn new Bad Guy
generateThrowable()
lastSpawnTime = currentTick
}
}
}
}
我没有检查其他部件。（您的代码仍然需要大量资源…）
但这条线：
func didBeginContact(contact: SKPhysicsContact) {
需要更改为：
func didBegin(_ contact: SKPhysicsContact) {
Swift 3中。（这是Xcode建议的，只需键入didBegin。）
请尝试。