我创建了一个应用Flappy Bird的克隆，我试图添加在游戏中随机出现的硬币。我的问题是，当鸟与它们发生碰撞时，我试图让硬币消失，但事实证明这是一项艰巨的任务。我有一个每3秒产生一枚硬币的功能;起初所有的硬币都有相同的categoryBitMask，但后来我改了它，所以每3个硬币都有classBitMask 1,2,3，重复出现。
我在代码上尝试了许多细微变化，以便在与鸟碰撞时摆脱硬币，有时硬币会消失，但有其他问题，如错误的硬币消失或没有更多的硬币产卵。以下是我认为您需要查看的所有代码：
class GameScene: SKScene, SKPhysicsContactDelegate {
var bird = SKSpriteNode()
var coin = SKSpriteNode()
let birdGroup: UInt32 = 1
let objectGroup: UInt32 = 2
let gapGroup: UInt32 = 0 << 3
let gapGroup2: UInt32 = 0 << 4
let gapGroup3: UInt32 = 0 << 5
var gameOver = 0
var movingObjects = SKNode()
var coinGroup1 = SKNode()
var coinGroup2 = SKNode()
var coinGroup3 = SKNode()
override func didMoveToView(view: SKView) {
/********| Bird physics body |********/
bird.physicsBody?.categoryBitMask = birdGroup
bird.physicsBody?.collisionBitMask = gapGroup
bird.physicsBody?.collisionBitMask = gapGroup2
bird.physicsBody?.collisionBitMask = gapGroup3
bird.physicsBody?.collisionBitMask = objectGroup
bird.physicsBody?.contactTestBitMask = objectGroup
bird.zPosition = 10
self.addChild(bird)
/********| Bird physics body |********/
/********| Spawning coins |********/
var timer = NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: Selector("spawnPipes"), userInfo: nil, repeats: true)
}
func spawnPipes(){
var coinTexture = SKTexture(imageNamed: "coin.png")
coin = SKSpriteNode(texture: coinTexture)
coin.size.height = bird.size.height
coin.size.width = bird.size.width
coin.position = CGPoint(x: CGRectGetMidX(self.frame) + self.frame.size.width * 1.33, y: CGRectGetMidY(self.frame) + movementAmount2)
coin.physicsBody = SKPhysicsBody(circleOfRadius: coin.size.height / 2)
coin.physicsBody?.dynamic = false
coin.runAction(moveAndRemove)
coin.physicsBody?.contactTestBitMask = birdGroup
if(i == 1){
coin.physicsBody?.categoryBitMask = gapGroup
coin.physicsBody?.collisionBitMask = gapGroup
coinGroup1.addChild(coin)
}else if(i == 2){
coin.physicsBody?.categoryBitMask = gapGroup2
coin.physicsBody?.collisionBitMask = gapGroup2
coinGroup2.addChild(coin)
}else if(i == 3){
coin.physicsBody?.categoryBitMask = gapGroup3
coin.physicsBody?.collisionBitMask = gapGroup3
coinGroup3.addChild(coin)
}else{
i = 1
}
}
/********| Spawning coins |********/
/********| Removing coins |********/
func didBeginContact(contact: SKPhysicsContact) {
if(gameOver == 0){
if((contact.bodyA.categoryBitMask == gapGroup || contact.bodyB.categoryBitMask == gapGroup) || (contact.bodyA.categoryBitMask == gapGroup2 || contact.bodyB.categoryBitMask == gapGroup2) || (contact.bodyA.categoryBitMask == gapGroup3 || contact.bodyB.categoryBitMask == gapGroup3)){
score++
scoreLabel.text = "\(score)"
if(contact.bodyA.categoryBitMask == gapGroup || contact.bodyB.categoryBitMask == gapGroup){
coinGroup1.removeAllChildren()
}else if(contact.bodyA.categoryBitMask == gapGroup2 || contact.bodyB.categoryBitMask == gapGroup2){
coinGroup2.removeAllChildren()
}else if(contact.bodyA.categoryBitMask == gapGroup3 || contact.bodyB.categoryBitMask == gapGroup3){
coinGroup3.removeAllChildren()
}
/********| Removing coins |********/
如果这个^^^还不够，这是我的所有代码：