我有三个移动的精灵。一个是球，一个是线，一个是三角形。当球击中线时，我想得分++然后用addBall（）函数产生另一个球。当球击中三角形时，我想结束比赛。
以下是我的代码。球直接穿过球和三角形而没有任何碰撞。有人能指出我正确的方向吗？
import SpriteKit
class GameScene: SKScene, SKPhysicsContactDelegate {
var center = SKSpriteNode()
var center2 = SKSpriteNode()
var centerLine = SKSpriteNode()
var bg = SKSpriteNode()
var bigCircle = SKSpriteNode()
let counterClockwise = SKAction.rotateByAngle(CGFloat(3.14), duration:1)
let clockwise = SKAction.rotateByAngle(CGFloat(-3.14), duration:1)
var spin = SKAction()
var score = 0
var setCenter = SKAction.rotateByAngle(CGFloat(-1.75), duration:1)
var setCenter2 = SKAction.rotateByAngle(CGFloat(1.75), duration:1)
struct PhysicsCategory {
static let None : UInt32 = 0
static let All : UInt32 = UInt32.max
static let ball : UInt32 = 0x1 // 1
static let triangle : UInt32 = 0x1 << 1 // 2
static let line : UInt32 = 0x1 << 2 // 4
}
override func didMoveToView(view: SKView) {
let value = UIInterfaceOrientation.LandscapeLeft.rawValue
UIDevice.currentDevice().setValue(value, forKey: "orientation")
//Background
var bgTexture = SKTexture(imageNamed: "images/bg.png")
bg = SKSpriteNode(texture:bgTexture)
bg.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
bg.zPosition = -4
self.addChild(center)
//Center Circle
var bigCircleTexture = SKTexture(imageNamed: "images/bigCircle.png")
bigCircle = SKSpriteNode(texture:bigCircleTexture)
bigCircle.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
self.addChild(bigCircle)
bigCircle.zPosition = -3
//Center Triangle
var centerTexture = SKTexture(imageNamed: "center.png")
center = SKSpriteNode(texture:centerTexture)
center.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
center.zPosition = -1
center.physicsBody = SKPhysicsBody(rectangleOfSize: center.size)
center.physicsBody?.categoryBitMask = PhysicsCategory.triangle
self.addChild(center)
center.runAction(setCenter)
center.removeAllActions()
spin = clockwise
center.runAction(SKAction.repeatActionForever(spin))
//Center Triangle 2
var centerTexture2 = SKTexture(imageNamed: "center.png")
center2 = SKSpriteNode(texture:centerTexture)
center2.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
center2.zPosition = -1
center2.physicsBody = SKPhysicsBody(rectangleOfSize: center2.size)
center2.physicsBody?.categoryBitMask = PhysicsCategory.triangle
self.addChild(center)
center2.runAction(setCenter2)
center2.removeAllActions()
spin = clockwise
center.runAction(SKAction.repeatActionForever(spin))
//Center Line
var centerLineTexture = SKTexture(imageNamed: "centerLine.png")
centerLine = SKSpriteNode(texture:centerLineTexture)
centerLine.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame) + center.size.height)
centerLine.zPosition = -2
centerLine.physicsBody = SKPhysicsBody(rectangleOfSize: centerLine.size)
centerLine.physicsBody?.categoryBitMask = PhysicsCategory.line
self.addChild(centerLine)
spin = clockwise
centerLine.runAction(SKAction.repeatActionForever(spin))
//Create Balls
//Ball Settings
func randomCGFloat() -> CGFloat {
return CGFloat(Double(arc4random())/Double(UInt32.max) )
}
var ball = SKSpriteNode(imageNamed: "newBall.png")
var randomBall = arc4random_uniform(4) + 1
var moveBall = SKAction.moveTo(CGPointMake(self.size.width/2,self.size.height/2), duration:3.0)
ball.physicsBody = SKPhysicsBody(circleOfRadius: ball.size.height / 2)
ball.physicsBody?.dynamic = false
ball.physicsBody?.allowsRotation = false
ball.physicsBody?.categoryBitMask = PhysicsCategory.ball
ball.physicsBody?.collisionBitMask = PhysicsCategory.triangle
ball.physicsBody?.contactTestBitMask = PhysicsCategory.triangle
ball.physicsBody?.collisionBitMask = PhysicsCategory.line
//Initial Ball
if score == 0 {
ball.position = CGPointMake(self.size.width/2, self.size.height)
self.addChild(ball)
ball.runAction(moveBall)
}
//Spawning and Moving Balls
func addBall() {
if randomBall == 1 {
ball.position = CGPointMake(self.size.width/2, self.size.height)
self.addChild(ball)
ball.runAction(moveBall)
}
else if randomBall == 2 {
ball.position = CGPointMake(self.size.width, self.size.height/2)
self.addChild(ball)
ball.runAction(moveBall)
}
else if randomBall == 3{
ball.position = CGPointMake(self.size.width/2, -self.size.height)
self.addChild(ball)
ball.runAction(moveBall)
}
else if randomBall == 4 {
ball.position = CGPointMake(self.size.width - self.size.width, self.size.height/2)
self.addChild(ball)
ball.runAction(moveBall)
}
}
func didBeginContact(contact: SKPhysicsContact) {
if contact.bodyA.categoryBitMask == PhysicsCategory.line {
score++
println("\(score)")
} else if contact.bodyA.categoryBitMask == PhysicsCategory.triangle {
println("lost")
}
}
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
/* Called when a touch begins */
if spin == clockwise {
center.removeAllActions()
centerLine.removeAllActions()
spin = counterClockwise
}
else {
center.removeAllActions()
centerLine.removeAllActions()
spin = clockwise
}
center.runAction(SKAction.repeatActionForever(spin))
centerLine.runAction(SKAction.repeatActionForever(spin))
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
}
}
答案 0 :(得分：0)
首先，您需要为要与物理交互的每个对象（重力，碰撞......）设置SKPhysicsBody。目前您的线和三角形不是这种情况。
之后，组（类别位掩码）未正确设置。的确，0 << 3是不对的。您可能希望声明类别位掩码，如下所示：
struct PhysicsCategory {
static let None : UInt32 = 0
static let All : UInt32 = UInt32.max
static let Ball : UInt32 = 0b1 // 1
static let Triangle : UInt32 = 0b10 // 2
static let Line : UInt32 = 0b100 // 4
}
或者像这样：
struct PhysicsCategory {
static let None : UInt32 = 0
static let All : UInt32 = UInt32.max
static let Ball : UInt32 = 0x1 // 1
static let Triangle : UInt32 = 0x1 << 1 // 2
static let Line : UInt32 = 0x1 << 2 // 4
}
这是我为another question制作的表格，对于类别位掩码也可能有所帮助： http://goo.gl/7D8EGY