我m making a test alien shooter game, where i want the player to gain points from shooting one kind of alien and lose from another. And when the player collides with the aliens he loses points. But i陷入了一个问题，即当我与外星人碰撞时（categorybitmask 0），什么也没发生。但是，当玩家与categorybitmask 1发生冲突时，他将失去积分。我需要它对两个外星人都起作用。
我尝试过更改categorybitmask，碰撞位掩码和contactTestbitmask，但是没有任何效果。我已经添加了很多代码，以便您可以看到它们如何挂在一起。
// let xPos = CGFloat.random(in: 0...414)
// let yPos = frame.size.height + player.size.height
// player.position = CGPoint(x: xPos, y: yPos)
player.zPosition = -1;
let index = Int.random(in: 0...1)
player.physicsBody = SKPhysicsBody(rectangleOf: player.size)
player.physicsBody?.isDynamic = false
player.physicsBody?.categoryBitMask = playerCategory
player.physicsBody?.contactTestBitMask = alienCategories[index]
player.physicsBody?.collisionBitMask = alienCategories[index]
player.physicsBody?.usesPreciseCollisionDetection = true
self.addChild(player)
self.physicsWorld.gravity = CGVector(dx: 0, dy: 0)
self.physicsWorld.contactDelegate = self
scoreLabel = SKLabelNode(text: "Score: 0")
scoreLabel.position = CGPoint(x: 100, y: self.frame.size.height - 60)
scoreLabel.fontName = "AmericanTypewriter-Bold"
scoreLabel.fontSize = 36
scoreLabel.fontColor = UIColor.white
score = 0
self.addChild(scoreLabel)
gameTimer = Timer.scheduledTimer(timeInterval: 0.75, target: self, selector: #selector(addAlien), userInfo: nil, repeats:true) //Hvor ofte ting skal spawne / normal = 0.75
gameTimer = Timer.scheduledTimer(timeInterval: 28, target: self, selector: #selector(shutoff), userInfo: nil, repeats:false) //Hvor ofte ting skal spawne / normal = 0.75
gameTimer = Timer.scheduledTimer(timeInterval: 30, target: self, selector: #selector(begin2), userInfo: nil, repeats:true) //Hvor ofte ting skal spawne / normal = 0.75
motionManger.accelerometerUpdateInterval = 0.2
motionManger.startAccelerometerUpdates(to: OperationQueue.current!) { (data:CMAccelerometerData?, error:Error?) in
if let accelerometerData = data {
let acceleration = accelerometerData.acceleration
self.xAcceleration = CGFloat(acceleration.x) * 0.75 + self.xAcceleration * 0.25
}
}
}
func shutoff(){
gameTimer.invalidate()
}
func begin2(){
gameTimer = Timer.scheduledTimer(timeInterval: 0.60, target: self, selector: #selector(addAlien), userInfo: nil, repeats:true) //Hvor ofte ting skal spawne / normal = 0.75
}
func addAlien () {
let index = Int.random(in: 0...1)
let textureName = alienTextureNames[index]
alien = SKSpriteNode(imageNamed: textureName)
let xPos = CGFloat.random(in: 0...414)
let yPos = frame.size.height + alien.size.height
alien.position = CGPoint(x: xPos, y: yPos)
alien.zPosition = -1;
alien.physicsBody = SKPhysicsBody(rectangleOf: alien.size)
alien.physicsBody?.isDynamic = true
alien.physicsBody?.categoryBitMask = alienCategories [index]
alien.physicsBody?.contactTestBitMask = photonTorpedoCategory
alien.physicsBody?.collisionBitMask = photonTorpedoCategory
self.addChild(alien)
let moveAction = SKAction.moveTo(y: -alien.size.height, duration: 6)
alien.run(moveAction, completion: { alien.removeFromParent() })
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
fireTorpedo()
}
func fireTorpedo() {
let index = Int.random(in: 0...1)
let index2 = Int.random(in: 0...1)
let textureName = alienTextureNames[index]
self.run(SKAction.playSoundFileNamed("torpedo.mp3", waitForCompletion: false))
let torpedoNode = SKSpriteNode(imageNamed: "torpedo")
torpedoNode.position = player.position
torpedoNode.position.y += 5
torpedoNode.physicsBody = SKPhysicsBody(circleOfRadius: torpedoNode.size.width / 2)
torpedoNode.physicsBody?.isDynamic = true
torpedoNode.physicsBody?.categoryBitMask = photonTorpedoCategory
torpedoNode.physicsBody?.contactTestBitMask = photonTorpedoCategory
torpedoNode.physicsBody?.collisionBitMask = photonTorpedoCategory
torpedoNode.physicsBody?.usesPreciseCollisionDetection = true
self.addChild(torpedoNode)
let animationDuration:TimeInterval = 0.3
var actionArray = [SKAction]()
actionArray.append(SKAction.move(to: CGPoint(x: player.position.x, y: self.frame.size.height + 10), duration: animationDuration))
actionArray.append(SKAction.removeFromParent())
torpedoNode.run(SKAction.sequence(actionArray))
}
func didBegin(_ contact: SKPhysicsContact) {
var firstBody:SKPhysicsBody
var secondBody:SKPhysicsBody
if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
firstBody = contact.bodyA
secondBody = contact.bodyB
}else{
firstBody = contact.bodyB
secondBody = contact.bodyA
}
if firstBody.categoryBitMask == playerCategory && secondBody.categoryBitMask == alienCategories[0] {
playerDidCollideWithAlien(playerNode: firstBody.node as! SKSpriteNode, alienNode: secondBody.node as! SKSpriteNode)
score -= 5
}
if firstBody.categoryBitMask == playerCategory && secondBody.categoryBitMask == alienCategories[1] {
playerDidCollideWithAlien2(playerNode: firstBody.node as! SKSpriteNode, alienNode: secondBody.node as! SKSpriteNode)
score -= 5
}
if firstBody.categoryBitMask == photonTorpedoCategory && secondBody.categoryBitMask == alienCategories[0] {
torpedoDidCollideWithAlien(torpedoNode: firstBody.node as! SKSpriteNode, alienNode: secondBody.node as! SKSpriteNode)
score += 5
}else if firstBody.categoryBitMask == photonTorpedoCategory && secondBody.categoryBitMask == alienCategories[1] {
torpedoDidCollideWithREDAlien(torpedoNode: firstBody.node as! SKSpriteNode, alienNode: secondBody.node as! SKSpriteNode)
score -= 5
}/*else if firstBody.categoryBitMask == photonTorpedoCategory && secondBody.categoryBitMask == alienCategories[2] {
torpedoDidCollideWithAlien(torpedoNode: firstBody.node as! SKSpriteNode, alienNode: secondBody.node as! SKSpriteNode)
score -= 10
}
*/
}
func playerDidCollideWithAlien (playerNode:SKSpriteNode, alienNode:SKSpriteNode) {
let explosion = SKEmitterNode(fileNamed: "Explosion")!
explosion.position = alienNode.position
self.addChild(explosion)
self.run(SKAction.playSoundFileNamed("explosion.mp3", waitForCompletion: false))
playerNode.removeFromParent()
self.run(SKAction.wait(forDuration: 2)) {
explosion.removeFromParent()
}
}
func playerDidCollideWithAlien2 (playerNode:SKSpriteNode, alienNode:SKSpriteNode) {
let explosion = SKEmitterNode(fileNamed: "Explosion2")!
explosion.position = alienNode.position
self.addChild(explosion)
self.run(SKAction.playSoundFileNamed("explosion.mp3", waitForCompletion: false))
alienNode.removeFromParent()
self.run(SKAction.wait(forDuration: 2)) {
explosion.removeFromParent()
}
}
func torpedoDidCollideWithAlien (torpedoNode:SKSpriteNode, alienNode:SKSpriteNode) {
let explosion = SKEmitterNode(fileNamed: "Explosion")!
explosion.position = alienNode.position
self.addChild(explosion)
self.run(SKAction.playSoundFileNamed("explosion.mp3", waitForCompletion: false))
torpedoNode.removeFromParent()
alienNode.removeFromParent()
self.run(SKAction.wait(forDuration: 2)) {
explosion.removeFromParent()
}
//score += 5
}
func torpedoDidCollideWithREDAlien (torpedoNode:SKSpriteNode, alienNode:SKSpriteNode) {
let explosion = SKEmitterNode(fileNamed: "Explosion2")!
explosion.position = alienNode.position
self.addChild(explosion)
self.run(SKAction.playSoundFileNamed("explosion.mp3", waitForCompletion: false))
torpedoNode.removeFromParent()
alienNode.removeFromParent()
self.run(SKAction.wait(forDuration: 2)) {
explosion.removeFromParent()
}
//score += 5
}