我正在制作2D sidescroller游戏。我有一个名叫龙的角色和各种平台，障碍物和从右到左的敌人等。我的角色与平台发生碰撞，但与障碍物碰撞。我试图让他与障碍物发生碰撞但不知何故它不起作用。
设置categoryBitMasks：
struct PhysicsCatagory{
static let dragon : UInt32 = 0x1 << 1
static let ground : UInt32 = 0x1 << 2
static let platforms : UInt32 = 0x1 << 3
static let bigGroundPlatform : UInt32 = 0x1 << 4
static let enemy : UInt32 = 0x1 << 5
static let obstacle : UInt32 = 0x1 << 6
static let obstacleDeathObject : UInt32 = 0x1 << 7
static let spring : UInt32 = 0x1 << 8
}
以下是我设置角色的方式：
func addDragon() {
dragon = SKSpriteNode(imageNamed: "Dragon-Standing")
dragon.zPosition = 100
dragon.anchorPoint = CGPointMake(0.6, 0.5)
dragon.position = CGPoint(x: 300, y: 300)
dragon.setScale(0.21)
dragon.name = "Dragon"
let dragonsPhysicsBody = SKSpriteNode()
dragonsPhysicsBody.size = CGSize(width: 170, height: 170)
dragonsPhysicsBody.zPosition = 99
dragonsPhysicsBody.position.x = dragon.position.x; dragonsPhysicsBody.position.y = dragon.position.y
dragon.physicsBody = SKPhysicsBody(rectangleOfSize: dragonsPhysicsBody.size)
dragon.physicsBody?.categoryBitMask = PhysicsCatagory.dragon
dragon.physicsBody?.contactTestBitMask = PhysicsCatagory.ground | PhysicsCatagory.platforms | PhysicsCatagory.bigGroundPlatform | PhysicsCatagory.obstacle
dragon.physicsBody?.collisionBitMask = PhysicsCatagory.ground | PhysicsCatagory.obstacle
dragon.physicsBody?.affectedByGravity = true
dragon.physicsBody?.dynamic = true
dragon.physicsBody?.allowsRotation = false
dragon.physicsBody?.restitution = 0
dragon.physicsBody?.mass = 0.176455050706863
worldNode.addChild(dragon)
}
障碍代码：
func createObstacle() {
if imageNameObstacles == "Stone_Obstacle1" {
wasStoneObstacle1Here = true
wasStoneObstacle2Here = false
obstacle = SKSpriteNode(texture: stone_Obstacle1_Texture)
obstacle.xScale = 0.32
obstacle.yScale = 0.27
obstacle.zPosition = 3
let randomObstaclePositions = arc4random_uniform(3) + 1;
// RANDOM OBSTACLE POSITION STUFF
obstacle.physicsBody = SKPhysicsBody(rectangleOfSize: obstacle.size)
obstacle.physicsBody?.categoryBitMask = PhysicsCatagory.obstacle
obstacle.physicsBody?.contactTestBitMask = PhysicsCatagory.dragon
obstacle.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
obstacle.physicsBody?.dynamic = false
obstacle.physicsBody?.affectedByGravity = false
obstacle.physicsBody?.friction = 0.0
obstacle.physicsBody?.restitution = 0.0
groundPair.addChild(obstacle)
}
我的平台代码：
func platforms_3() {
spawnedPlatform3 = true
bigGroundPlatform = SKSpriteNode(texture: middle_Ground_Platform_Texture)
bigGroundPlatform.zPosition = 4
bigGroundPlatform.xScale = 0.45; bigGroundPlatform.yScale = 0.50
bigGroundPlatform.position = CGPoint(x: 2800, y: 355)
bigGroundPlatform.physicsBody = SKPhysicsBody(rectangleOfSize: bigGroundPlatform.size)
bigGroundPlatform.physicsBody?.categoryBitMask = PhysicsCatagory.bigGroundPlatform
bigGroundPlatform.physicsBody?.contactTestBitMask = PhysicsCatagory.dragon
bigGroundPlatform.physicsBody?.dynamic = false
bigGroundPlatform.physicsBody?.affectedByGravity = false
bigGroundPlatform.physicsBody?.friction = 0.0
bigGroundPlatform.physicsBody?.restitution = 0.0
groundPair = SKNode()
groundPair.zPosition = 4
groundPair.addChild(bigGroundPlatform)
let movePlatforms = SKAction.runBlock({
() in
let distance = CGFloat(25000)
let moveGroundObjects = SKAction.moveByX(-distance, y: 0, duration: NSTimeInterval(self.platformSpeed))
let removeGroundObjects = SKAction.removeFromParent()
self.moveAndRemove = SKAction.sequence([moveGroundObjects, removeGroundObjects])
self.groundPair.runAction(self.moveAndRemove)
})
groundPair.runAction(movePlatforms)
worldNode.addChild(groundPair)
}
我的平台的collisionBitMask没有设置，因为如果我的角色在一个平台下并试图跳跃，他会与它碰撞而不是跳过它然后降落在它上面。 此代码解决了上述问题：
func makePlatformsNil() { // Runs in update function
if dragon.physicsBody?.velocity.dy < -0.0 {
platform1.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
platform2.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
platform3.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
platform4.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
platform5.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
platform6.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
platform7.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
platform8.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
platform9.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
platform10.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
bigGroundPlatform.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
bigGroundPlatform2.physicsBody?.collisionBitMask = PhysicsCatagory.dragon
dragon.physicsBody?.collisionBitMask = PhysicsCatagory.ground | PhysicsCatagory.platforms | PhysicsCatagory.bigGroundPlatform
}
if dragon.physicsBody?.velocity.dy > 0.0 {
platform1.physicsBody?.collisionBitMask = 0
platform2.physicsBody?.collisionBitMask = 0
platform3.physicsBody?.collisionBitMask = 0
platform4.physicsBody?.collisionBitMask = 0
platform5.physicsBody?.collisionBitMask = 0
platform6.physicsBody?.collisionBitMask = 0
platform7.physicsBody?.collisionBitMask = 0
platform8.physicsBody?.collisionBitMask = 0
platform9.physicsBody?.collisionBitMask = 0
platform10.physicsBody?.collisionBitMask = 0
bigGroundPlatform.physicsBody?.collisionBitMask = 0
bigGroundPlatform2.physicsBody?.collisionBitMask = 0
dragon.physicsBody?.collisionBitMask = PhysicsCatagory.ground
}
if collidingWithGround == true {
bigGroundPlatform.physicsBody?.collisionBitMask = 0
dragon.physicsBody?.collisionBitMask = PhysicsCatagory.ground
}
}
正如你所看到的，我的龙的碰撞障碍和我的障碍都被正确设置但它们仍然没有碰撞。现在有人为什么？ 我在didBeginContact中放了一个print语句，看看当龙和障碍物碰撞时它是否被调用，它被调用。
感谢任何帮助。 提前谢谢。