我一直在设计一种游戏，希望球一接触地面就立即停止。我在下面的功能旨在建立基础。
class GameScene: SKScene, SKPhysicsContactDelegate {
var ground = SKNode()
let groundCategory: UInt32 = 0x1 << 0
let ballCategory: UInt32 = 0x1 << 1
//Generic Anchor coordinate points
let anchorX: CGFloat = 0.5
let anchorY: CGFloat = 0.5
/*Sets the background and ball to be in the correct dimensions*/
override init(size: CGSize) {
super.init(size: size)
//Create the Phyiscs of the game
setUpPhysics()
setUpGround()
setUpBall()
}
func setUpPhysics() -> Void {
self.physicsWorld.gravity = CGVectorMake( 0.0, -5.0 )
self.physicsWorld.contactDelegate = self
}
func setUpGround() -> Void {
self.ground.position = CGPointMake(0, self.frame.size.height)
self.ground.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(self.frame.size.width, self.frame.size.height)) //Experiment with this
self.ground.physicsBody?.dynamic = false
self.ground.physicsBody?.categoryBitMask = groundCategory //Assigns the bit mask category for ground
self.ball.physicsBody?.contactTestBitMask = ballCategory //Assigns the contacts that we care about for the ground
/*Added in*/
self.ground.physicsBody?.dynamic = true
self.ground.physicsBody?.affectedByGravity = false
self.ground.physicsBody?.allowsRotation = false
/**/
self.addChild(self.ground)
}
func setUpBall() -> Void {
ball.anchorPoint = CGPointMake(anchorX, anchorY)
self.ball.position = CGPointMake(self.frame.size.width/2, self.frame.size.height/2)
self.ball.name = "ball"
self.ball.userInteractionEnabled = false
ball.physicsBody?.usesPreciseCollisionDetection = true
self.ball.physicsBody?.categoryBitMask = ballCategory //Assigns the bit mask category for ball
self.ball.physicsBody?.collisionBitMask = wallCategory | ceilingCategory //Assigns the collisions that the ball can have
self.ball.physicsBody?.contactTestBitMask = groundCategory //Assigns the contacts that we care about for the ball
addChild(self.ball) //Add ball to the display list
}
我注意到的问题是，当我运行iOS模拟器时，未检测到“地面”节点。我在这种情况下做错了什么？
最佳答案
您的ballCategory应该分配给self.ground.contactBitMask而不是球。
关于ios - 使用SpriteKit设置地面节点？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32526283/